Recent advances in gastrointestinal oncology - updates and insights from the 2009 annual meeting of the American Society of Clinical Oncology
© Javle and Hsueh; licensee BioMed Central Ltd. 2010
Received: 23 December 2009
Accepted: 23 March 2010
Published: 23 March 2010
We have reviewed the pivotal presentations related to gastrointestinal malignancies from 2009 annual meeting of the American Society of Clinical Oncology with the theme of "personalizing cancer care". We have discussed the scientific findings and the impact on practice guidelines and ongoing clinical trials. Adding trastuzumab to chemotherapy improved the survival of patients with advanced gastric cancer overexpressing human epidermal growth factor receptor 2. Gemcitabine plus cisplatin has become a new standard for first-line treatment of advanced biliary cancer. Octreotide LAR significantly lengthened median time to tumor progression compared with placebo in patients with metastatic neuroendocrine tumors of the midgut. Addition of oxaliplatin to fluoropyrimidines for preoperative chemoradiotherapy in patients with stage II or III rectal cancer did not improve local tumor response but increased toxicities. Bevacizumab did not provide additional benefit to chemotherapy in adjuvant chemotherapy for stage II or III colon cancer. In patients with resected stage II colon cancer, recurrence score estimated by multigene RT-PCR assay has been shown to provide additional risk stratification. In stage IV colorectal cancer, data have supported the routine use of prophylactic skin treatment in patients receiving antibody against epidermal growth factor receptor, and the use of upfront chemotherapy as initial management in patients with synchronous metastasis without obstruction or bleeding from the primary site.
The prognosis of advanced gastrointestinal cancers has improved modestly over the last two decades. In the 2009 annual meeting of the American Society of Clinical Oncology (ASCO), it has become clear that targeted therapies and personalized medicine for many cancer types will soon become the standard of care. These data contributed strongly towards the theme of the 2009 meeting - "Personalizing Cancer Care".
First-line and targeted therapy for advanced gastroesophageal cancer
Human epidermal growth factor receptor 2 (HER2) exhibits tyrosine kinase activity and functions as a growth factor receptor . The overexpression of HER2 as a result of gene amplification has been demonstrated in solid tumors such as breast and gastric cancers, and correlates with aggressive course and poor prognosis [2, 3]. Immunohistochemistry (IHC) and fluorescent in-situ hybridization (FISH) are commonly used to measure HER2.
Pre-clinical studies have shown that trastuzumab, a monoclonal antibody against HER2, causes cell cycle arrest at G1 and exhibits antitumor activity in HER2 overexpressed gastric cancer [4, 5]. Moreover, trastuzumab can enhance chemotherapeutic efficacy in gastric cancer xenograft with HER2 overexpression, when combined with cytotoxic agents such as capecitabine, cisplatin, or taxane . Phase II studies incorporating trastuzumab with cisplatin-based regimen in patients with advanced gastric cancer overexpressing HER2 have shown encouraging activities [7, 8].
Phase II studies incorporating targeted agents in advanced gastroesophageal cancer
S-1 (TS-1®, Taiho Pharmaceutical Co., Ltd.) is an orally active combination of tegafur (a 5-FU prodrug), gimeracil (an inhibitor of dihydropyrimidine dehydrogenase), and oteracil (which inhibits the phosphorylation of 5-FU in the gastrointestinal tract, thereby reducing the gastrointestinal toxic effects of 5-FU) and is widely used in Asia for the management of gastric cancer. Adjuvant therapy with S1 improved survival after gastrectomy and D2 dissection as compared with controls in a prospective trial . FLAGS trial, a phase III and multi-center study, enrolled 1053 patients with advanced gastric cancer, and compared cisplatin with either S-1 or 5-FU as first-line therapy . The primary endpoint was overall survival, and there was no overall survival improvement with the S1-based regimen. However, toxicity was lower in S1 and cisplatin group as compared with cisplatin and 5-FU in a subset analysis, and there was an improvement in survival among patients with the diffuse-type of gastric cancer. Updated findings of JCOG 9912, which was a phase III study conducted in Japan, were reported in 2009 ASCO meeting . This study compared 5-FU, irinotecan plus cisplatin, and S1 as first-line treatment in patients with advanced gastric cancer, and the median survival figures were 10.8, 12.3 and 11.5 months, respectively. Although there was a significant non-inferiority of S-1 to 5-FU (P < 0.001); however, either S-1 or irinotecan plus cisplatin failed to show superiority to 5-FU (P = 0.034 and 0.055, respectively). Based on these results as well as the FLAGS data, it is unlikely that S1 will be developed in upper gastrointestinal cancers in the United States.
Treatment of localized gastroesophageal cancer
Neoadjuvant chemoradiotherapy (CRT) is commonly used in the United States before esophagecomy for esophageal cancer. The Southwest Oncology Group S0356 study demonstrated that oxaliplatin is safe in the neoadjuvant setting and may potentially replace cisplatin when given with concurrent 5-FU and radiation . Schuhmacher et al. investigated the role of preoperative 5-FU, leucovorin (LV) and cisplatin chemotherapy for operable gastric cancer . Accrual was slow and the study was stopped prematurely after enrolling 144 patients to surgery alone vs. preoperative therapy. There was no significant survival improvement with preoperative chemotherapy, although this resulted in lower margin-positive rate. In European countries, perioperative chemotherapy based on the results of the MAGIC trial with epirubicin, cisplatin and 5-FU is frequently used and this approach will continue to be the standard of care even after 2009 ASCO annual meeting .
The Eastern Cooperative Oncology Group (ECOG) E2202 evaluated the safety of a novel form of esophagectomy, called minimally invasive esophagectomy (MIE) in a prospective multi-center trial. MIE involves thoracoscopic and laparoscopic techniques in place of 'open' surgery . As per the E2202 experience, MIE can be performed safely with low post-operative morbidity and mortality.
The mortality of cholangiocarcinoma is increasing world-wide, particularly in areas with low incidence. Part of this trend may be artifactual, as cancers formerly described as 'liver metastases of unknown primary' are increasingly being classified as intrahepatic cholangiocarcinoma. Gemcitabine or fluoropyrimidines are commonly utilized for the treatment of advanced disease. However, randomized, prospective trial data were lacking in this disease. Valle et al. previously reported the results of a phase II randomized trial of gemcitabine vs. gemcitabine plus cisplatin for the treatment of advanced biliary cancer . In their phase II study, the median time to tumor progression and 6-month progression-free survival (the primary end point) were greater in the gemcitabine and cisplatin arm vs. the gemcitabine-only arm. Based on these results, they initiated a phase III, multicenter trial of the two regimens for advanced biliary cancer (ABC-02) patients, the results of which were reported in ASCO 2009 meeting . Four hundred and ten patients were enrolled (including 149 patients with gall bladder cancer) in a 1:1 randomized trial design. The treatments were well-tolerated in both the arms, surprisingly there was no added toxicity (hematological or grade 3 or 4 non-hematological) despite the addition of cisplatin. There was a significant improvement in survival noted in the gemcitabine plus cisplatin regimen as compared with gemcitabine alone (11 vs. 8 months, p = 0.002). This was also accompanied by an improved progression-free survival. Gemcitabine plus cisplatin therefore becomes a new standard of care for patients with advanced biliary cancer. It is expected that future strategies will add targeted agents to this combination.
BINGO study is a randomized phase II study comparing gemcitabine plus oxaliplatin chemotherapy alone or in combination with cetuximab in patients with advanced biliary cancer . The interim safety analysis of this randomized study indicated no added toxicity with the addition of cetuximab; efficacy data are awaited. Zhu et al. have combined gemcitabine and oxaliplatin with bevacizumab and demonstrated promising efficacy of this combination in advanced biliary cancer . In this study, 18-fluorodeoxyglucose PET scan was used to assess response, and PET responses correlated with survival. Since this disease is often difficult to assess the response by CT scan, further exploration of PET imaging modality is warranted .
Transarterial hepatic chemoembolization (TACE) is widely used for the management of regionally advanced hepatocellular carcinoma (HCC). TACE improves local control and is palliative, although its survival impact is controversial. Recently, drug-eluting beads have been employed for TACE in an attempt to increase the control rate. Lencioni et al. presented the results of a randomized trial conducted in 212 patients with unresectable HCC who were randomized to TACE with drug-eluting beads uploaded with doxorubicin vs. conventional TACE with doxorubicin-in-oil emulsion . There was a significant improvement in response rate 52% vs. 44% with the drug-eluting beads, and this was also accompanied by a lower toxicity rate. This therapy is also being investigated in other malignancies such as neuroendocrine tumor and colorectal cancer (CRC) [27, 28].
Sorafenib has now become the standard first-line therapy for advanced HCC after the results of the SHARP trial . There are no standard options after progression beyond first-line therapy with sorafenib. Kaseb et al. presented the results of a phase II study of erlotinib and bevacizumab for advanced HCC . Toxicity associated with this regimen was acceptable and the response rate was impressive at 28%. The overall survival was 12 months, and responses were noted in patients who had received prior systemic therapy. Based on these encouraging results, a randomized phase II study of bevacizumab plus erlotinib vs. sorafenib as first-line therapy in patients with advanced HCC is being conducted.
Brivanib is a dual tyrosine kinase inhibitor of vascular endothelial growth factor receptor and fibroblast growth factor receptor. Raoul et al. reported the results of a phase II study of brivanib in 96 patients (38 of them failed prior sorafenib) with advanced HCC . The median survival of patients without prior systemic therapy was 10 months. Anti-tumor effect was noted in patient received no prior systemic therapy and in patients failed prior sorafenib treatment. Fatigue, hyponatremia, diarrhea and hypertension were the important toxicities noted. Randomized phase III studies of first-line treatment comparing brivanib vs. sorafenib, and second-line treatment comparing best supportive care plus brivanib vs. best supportive care with placebo in patients with advanced HCC are ongoing.
The study conducted by Gastrointestinal Tumor Study Group in the late 1970s and early 1980s showed that adjuvant therapy with 5-FU plus radiotherapy followed by maintenance 5-FU chemotherapy after surgical resection for pancreatic cancer improved the overall survival . The subsequent ESPAC-1 study suggested that 5-FU chemotherapy was superior to CRT in the adjuvant setting . CONKO-001 study proved that adjuvant gemcitabine was superior to observation . In 2009 ASCO meeting, the results of ESPAC-3, the largest adjuvant study for pancreatic cancer, were presented . This study compared 5-FU plus LV vs. gemcitabine in 1088 patients after curative pancreatectomy, enrolled in 16 countries, mostly in Europe. There was no statistically significant survival difference between these two arms. Thus even in 2009, there appears to be no regimen better than 5-FU as adjuvant therapy in resected pancreatic cancer. The ESPAC group has launched a subsequent phase III study comparing gemcitabine plus capecitabine vs. gemcitabine. In tertiary institutions across the U.S., neoadjuvant therapy is gathering momentum as it appears to limit surgery to those most likely to benefit by excluding the cancers that have aggressive biology. American College of Surgeons Oncology Group has launched a phase II study of neoadjuvant chemotherapy with gemcitabine and erlotinib followed by pancreatectomy and postoperative adjuvant chemotherapy with gemcitabine and erlotinib for patients with operable pancreatic cancer.
Deep vein thrombosis (DVT) is a commonly encountered problem in patients with pancreatic cancer. Pro-thrombotic factors generated by the cancer cells, debility of the patients, dehydration and systemic chemotherapy have been thought to be the attributing factors. DVT in pancreatic cancer patients is associated with a poor prognosis and therefore its prevention is required. The CONKO-004 study randomized 300 patients with pancreatic cancer receiving gemcitabine-based chemotherapy to low-molecular weight heparin (enoxaparin) or observation . The primary endpoint was DVT occurrence in the first 3 months, during which patients received higher dose of enoxaparin (1 mg/kg/day). The secondary endpoint was overall survival. The investigators noted that the incidence of DVT was lower in the treatment arm as compared with the observation arm (10% vs. 1.3%), without any increase in the bleeding risk. However, there was no survival difference between these two arms.
Newer agents that appear to be promising in pancreatic cancer include abraxane, albumin-bound paclitaxel. Von Hoff et al. presented the preliminary efficacy data of the gemcitabine plus abraxane combination for patients with advanced pancreatic cancer . In this study, PET scan was used to measure response. They observed 23% complete metabolic response and more than 60% disease control rate (complete response, partial response and stable disease). The median overall survival was 9 months and there was a correlation between the expression of secreted protein acid rich in cysteine (SPARC) and clinical outcome. This regimen is currently being investigated in a randomized phase III study.
Promising results were also reported with cationic liposomal paclitaxel (EndoTAG-1) in combination with gemcitabine; a median survival of 11.5 months was noted in this study without serious toxicity . These two studies underscore the efficacy of taxanes in this disease and the importance of drug delivery using the nanoparticle formulations. Insulin-like growth factor 1 receptor (IGF1R) targeted antibodies and tyrosine kinase inhibitors are being investigated in a variety of tumor types including pancreatic cancer. Investigators from MD Anderson Cancer Center presented data on genetic variations in the IGF1R pathway and prognosis in locally advanced pancreatic cancer . In their analysis of 105 patients, a clear genotypic profile emerged which correlated with an adverse outcome and could potentially be targeted by IGF1R inhibitors.
Long-acting somatostatin analogues are widely used for symptomatic, low-grade neuroendocrine tumors such as carcinoids. The survival impact of this therapy was never examined prospectively. The PROMID study randomly assigned patients with inoperable metastatic neuroendocrine tumors with well-differentiated tumor histology to either placebo or octreotide LAR 30 mg intramuscularly every month until tumor progression [40, 41]. The primary end point was time to progression, and secondary end points were survival and response rate. The study was conducted in Germany and planned the enrollment of 162 patients. However, enrollment stopped after an interim analysis of 85 patients as the median time to tumor progression in the octreotide LAR group was 15.6 months versus 5.9 months in the placebo group (p = 0.00072) after 6 months of treatment. The most favorable effect was observed in patients with low hepatic tumor load (< 10%) and resected primary tumors. The authors concluded that octreotide LAR significantly lengthens median time to tumor progression compared with placebo in patients with functionally active and inactive metastatic neuroendocrine tumors of the midgut. This study is likely to expand the use of somatostatin analogues to this subgroup of patients although it should be noted that these results are based on a limited cohort of patients for whom no overall survival data is currently available.
Squamous cell carcinoma of anus is an uncommon malignancy of lower gastrointestinal tract. Several randomized studies have established CRT with 5-FU and mitomycin-C (MMC) as standard treatment yielding high rates of local control and 5-year disease-free survival without needing surgery or colostomy [42–44]. Due to frequent occurrence of severe toxicities associated with MMC, several phase II studies have used cisplatin instead of MMC in combination with 5-FU and radiotherapy with promising results [45, 46]. RTOG 98-11, a US Gastrointestinal Intergroup trial, compared CRT with 5-FU plus MMC vs. neoadjuvant chemotherapy with 5-FU plus cisplatin followed by CRT with 5-FU and cisplatin. In this study, cisplatin-based regimen was shown to be less effective than MMC-based regimen . The main criticism for this study is induction chemotherapy may provide detrimental effect due to delay in starting radiotherapy .
James et al. presented a randomized trial of anal cancer from the United Kingdom (ACT II) using 2 × 2 design comparing 5-FU with either cisplatin or MMC during CRT, followed by either observation or two cycles of maintenance chemotherapy with cisplatin and 5-FU . Response to CRT was excellent with about 95% of patients achieving a complete response at 6 months with either MMC or cisplatin-based regimen. Moreover, maintenance chemotherapy didn't affect disease-free or overall survival at three years, with 75% of patients without recurrences whether receiving maintenance chemotherapy or not. Although the rates of non-hematological toxicities were similar between MMC and cisplatin-based regimens, patients receiving MMC-based regimen had more grade 3/4 hematological toxicities (25 vs. 13%, p < 0.001). CRT with MMC and 5-FU remains the standard treatment for anal cancer, and there is no benefit for giving chemotherapy before or after CRT. In circumstances such as shortage of MMC or necessity to avoid severe hematological toxicities, cisplatin may replace MMC for the treatment of anal cancer.
Rectal cancer carries a high chance of local recurrence. Preoperative radiation therapy was compared with preoperative CRT with 5-FU in patients with locally advanced rectal cancer (LARC) including stage II or III rectal cancer, in French FFCD 9203 and European Organization for Research and Treatment of Cancer (EORTC) 22921 studies. Improved local control rate was noted in patients receiving CRT [49, 50]. In French FFCD 9203 study, combined treatment led to improved pathologic complete response of 11.4% (vs. 3.6% in the radiation arm) and improved 5-year local failure rates (8.1% vs. 16.5%, respectively). Therefore, neoadjuvant CRT is considered a standard treatment for patients with LARC such as T3 or T4 lesion or with regional lymph node involvement.
Data from phase I to II trials have shown that adding weekly oxaliplatin to 5-FU or capecitabine in preoperative CRT may improve pathologic response with acceptable grade 3/4 toxicities in patients with LARC [51, 52]. Three randomized phase III studies, STAR-01 (primary objective: overall survival), ACCORD 12/0405 PRODIGE 2 (primary objective: pathological complete response) and National Surgical Adjuvant Breast and Bowel Project (NSABP) R-04, have been conducted to study the role of oxaliplatin in the neoadjuvant CRT for LARC.
NSABP R-04 by far has the largest target patient number (~1600) with primary objective to compare the rates of local-regional tumor relapse, and has reached more than 80% of the accrual target since July 2004 . The trial was initially designed as a 2-arm study to compare 5-FU vs. capecitabine, and amended in January 2006 to a 2 × 2 design comparing 5-FU vs. capecitabine with/without weekly oxaliplatin as preoperative CRT in patients with LARC.
Two phase III studies investigating the role of adding oxaliplatin to preoperative chemoradiotherapy in rectal cancer
Radiotherapy (59.4 Gy)
(p < 0.0001)
Radiotherapy (45 Gy) and
PRODIGE 2 (primary
(p < 0.0001)
Adjuvant chemotherapy for colon cancer
Monoclonal antibodies directed against vascular endothelial growth factor and epidermal growth factor receptor have been approved to be used in stage IV CRC, but the benefit of these biologic agents in patients with stage II/III disease remains unknown. NSABP C-08 is a phase III randomized study enrolling ~2,700 patients with stage II/III colon cancer after surgery to compare a modified FOLFOX regimen known as mFOLOX6 (every 2 weeks for 12 cycles) vs. bevacizumab and mFOLFOX6 (every 2 weeks for 12 cycles then bevacizumab alone every 2 weeks for 14 cycles) as adjuvant therapy. The safety report was first presented in 2008 ASCO annual meeting, which demonstrated well-balanced grade 4/5 toxicities in each arm .
In 2009 ASCO annual meeting, Wolmark et al. presented the efficacy result from this study . Although improvement in disease-free survival (DFS) was observed during the first year in bevacizumab arm (94.3% vs. 90.7%; p = 0.004), the magnitude of this benefit became gradually attenuated with time when patients were no longer on bevacizumab. There was no significant difference in DFS at 3 years (77.4% vs. 75.5% for FOLOFOX group; p = 0.15). Subgroup analysis showed bevacizumab did not improve 3-year DFS for either stage II (~25% of study patients) or stage III.
The companion study of NSABP C-08 is AVANT (BO17920), which is a three-arm, international phase III study in patients with resected stage III or high-risk stage II colon cancer . High-risk stage II disease is defined by any one of the followings: T4 tumor, bowel obstruction or perforation, histological signs of vascular invasion or perineural invasion, age < 50 years, or < 12 lymph nodes analyzed. This study has enrolled ~3450 patients to receive FOLFOX-4 plus bevacizumab or XELOX (capecitabine and oxaliplatin) plus bevacizumab or FOLFOX-4 alone for 24 weeks. Patients in the bevacizumab arms continued to receive bevacizumab for additional 24 weeks, whereas patients in the FOLFOX arm were observed. The primary endpoint of this study is to compare 3-year DFS, and the result is expected to be available in 2010.
North Central Cancer Treatment Group (NCCTG) N0147 and Pan-European Trials in Adjuvant Colon Cancer (PETACC)-8 are two phase III adjuvant studies enrolling patients with resected stage III colon cancer to receive either FOLFOX or FOLFOX plus Cetuximab for 6 months . Since initiation in 2005, there have been more than 4,000 patients all together enrolled in these 2 studies with primary endpoint of comparing 3-year DFS. Both studies have been amended in 2008 after ASCO annual meeting to randomize patients only with wild-type K-RAS tumors. The interim analysis of PETACC-8 is expected in 2011. The pre-planned interim analysis of N0147 has concluded cetuximab plus FOLFOX did not improve 3-year DFS even in patients with wild-type K-RAS tumors. Therefore, N0147 was permanently closed on November 25, 2009, and the cetuximab treatment was discontinued simultaneously.
Prognostic and predictive biomarkers for stage II colon cancer
Approximately 75-80% of patients with stage II colon cancer are cured with surgery alone, and the benefit of adjuvant chemotherapy is controversial . The International Multicentre Pooled Analysis of B2 Colon Cancer Trials (IMPACT B2) has pooled the stage II populations of five similar randomized trials comparing 5-FU and LV vs. observation. This study included 1,016 patients, and failed to demonstrate any effect of chemotherapy . The United Kingdom QUASAR study which included more than 2,000 patients with stage II colon cancer has shown chemotherapy with 5-FU and LV provided a small improvement (~4%) in rates of recurrence and overall survival (OS) compared to patients on observation . Oncologists have frequently used clinical and pathological features such as tumor stage (T3 vs. T4), tumor perforation, inadequately sampled lymph nodes (<12), poor tumor cell differentiation, and extramural venous invasion, to identify patients who may harbor higher risk for recurrence and potentially benefit from adjuvant chemotherapy . Most of these features are not informative for the majority of patients, and have never been validated in perspective studies.
Emerging data have shown that microsatellite instability (MSI) and chromosome 18q loss of heterozygosity (18qLOH) in colon cancer may be useful as molecular prognostic markers in patients with stage II/III colon cancer [56, 64, 65]. The ongoing ECOG 5202 study is a perspective study in stage II colon cancer to identify high-risk patients for adjuvant treatment using molecular marker analysis including MSI and 18qLOH .
Bertagnolli et al presented 18qLOH analysis from Cancer and Leukemia Group B (CALGB) protocol 9581, which randomized 1738 patients with stage II colon cancer to postoperative treatment with monoclonal antibody 17-1A or observation . The result was initially reported in 2004 ASCO annual meeting. There was no difference in 5-year DFS and OS between patients receiving treatment and on observation. Among these patients, 537 tumor samples were obtained for molecular marker analysis, and 23% had MSI. Of the remaining samples, 101 tumor samples had 18qLOH, and 49 had intact 18q. There were significant differences in OS (98 vs. 85 m) and DFS (92 vs. 78 m) between patients with intact 18q and 18qLOH favoring patients with intact 18q. This result is in consistent with prior report that LOH at 18q is prognostic for DFS and OS in patients with early-stage colon cancer did not receive chemotherapy after surgery .
In an effort to develop new clinical tools for risk assessment and treatment decisions in stage II colon cancer, Kerr et al. presented the multi-gene expression assay in patients with stage II colon cancer . This assay is to use real-time RT-PCR to quantitate RNA derived from paraffin-embedded tumor tissue . They have initially identified 761 candidate genes from 1,851 patients' tumor samples in NSABP C-01/C-02/C-04/C-06 and Cleveland Clinic study. After further modeling and analysis, they have prospectively defined the recurrence score based on 7 genes associated with recurrence risk (stromal related genes: FAP, INHBA, BGN; cell-cycle related genes: Ki-67, C-MYC, MYBL-2; and GADD45B). Additionally, 6 genes were chosen and defined as treatment score. The recurrence and treatment scores were validated in 1,436 tumor samples (711 with surgery alone, and 725 with surgery plus adjuvant chemotherapy with 5-FU and LV) from QUASAR study. In 725 patients receiving surgery and adjuvant chemotherapy with 5-FU and LV, treatment score did not predict benefit of adjuvant chemotherapy.
In 711 patients receiving surgery alone, there was significant association between recurrence score and risk of recurrence at 3 years following surgery (P = .004). There were 43.7% in low-risk group (<30 recurrence score), 30.7% in intermediate group and 25.6% in high-risk group (> = 41 recurrence score). Estimated 3-year recurrence risk is 12% (95% CI 9-16%), 18% (95% CI 13-24), and 22% (95% CI 16-29), respectively in low-risk, intermediate and high-risk groups. Multivariate analyses identified three key independent predictors of recurrence in stage II colon cancer after surgery: T4 stage, MSI and recurrence score. In patients with T3 tumor and negative for MSI (~76% of stage II), recurrence score was found to be useful in predicting individual risk of recurrence. This is the first demonstration of a prospectively defined gene expression assay independently predicting risk of recurrence in stage II colon cancer after surgery.
The translational studies of PETACC 3/EORTC 40993/SAKK 60-00 trial were presented in this year's ASCO meeting [70, 71]. This study randomized 3,278 patients with stage II or III colon cancer after surgery to 5-FU/LV or 5-FU/LV/irinotecan . There was no significant difference in 5-yr DFS between these 2 treatment arms. Tumor samples were available from 1,404 patients, and MSI was analyzed in 1,327 samples. There was higher incidence of MSI in stage II (22%) vs. stage III (12%). MSI was a significant prognostic factor for relapse-free survival (HR 0.265, p = 0.0044) and overall survival (median follow up 68 months, HR 0.159, p = 0.011) in stage II colon cancer. There was no significant association between prognosis and MSI in stage III colon cancer, and this may be due to small sample size or possible stage specific biological effects. However, MSI was not predictive for the efficacy of irinotecan/5-FU/LV treatment in this study, which differed from the analysis in CALGB 89803 . Both p53 and the SMAD4 genes had prognostic value for stage III but not for stage II colon cancer. Contradictory to previously published report, 18qLOH failed to demonstrate prognostic value in stage II or III colon cancer. These findings suggest that stage II and III colon cancers may differ biologically.
Metastatic colorectal cancer: Management of skin rash in patients receiving antibody against epidermal growth factor receptor
Skin rash is the most common side effect for patients receiving antibody against epidermal growth factor receptor such as panitumumab. Severe skin rash may delay or interrupt treatment, therefore reducing the effectiveness of treatment. Mitchell et al. presented a randomized study comparing prophylactic skin treatment vs. reactive skin toxicity treatment (treatment after skin rash developed) in 95 patients with metastatic CRC receiving panitumumab-based chemotherapy . Forty-eight patients received prophylactic skin treatment including topically applied sunscreen, moisturizers and corticosteroids with oral antibiotics (doxycycline) starting 24 hours before the first dose of panitumumab, and 47 patients to reactive skin toxicity treatment. Twenty-nine percent of patients in the prophylactic group experienced skin toxicity vs. 62% of those in the reactive treatment group. The incidence of grade 2 or higher skin toxicities was significantly decreased by prophylactic skin treatment. Only 1% of patients in the prophylactic skin treatment arm experienced a dose delay compared with 6% of patients in the reactive skin treatment arm. The data is supportive of the routine use of prophylactic skin treatment in patients receiving epidermal growth factor receptor inhibitors.
Metastatic colorectal cancer: Upfront chemotherapy in patients with synchronous metastasis
In patients with newly-diagnosed CRC with synchronous metastasis, the benefit of immediate resection of primary tumor in the absence of symptoms (i.e. bleeding, perforation or obstruction) is unclear. Retrospective analyses in the pre-target therapy era have shown that resection of asymptomatic primary tumors was frequently associated with prolonged survival, but was not found to significantly reduce the incidence of life-threatening tumor-related complications [75–77].
Poultsides et al. presented a retrospective reviewed of 233 patients with synchronous metastatic CRC and unresected primary tumors treated with upfront chemotherapy in a single institute . Patients received FOLFOX or irinotecan plus 5-FU and LV with or without bevacizumab as initial treatment. Two hundred seventeen patients (93%) never required surgery to palliate primary tumor related complications. Ten patients (4%) required nonsurgical intervention such as stent or radiotherapy for symptomatic management of the primary site. Neither use of bevacizumab, location of the primary tumor in the rectum, or metastatic disease burden was associated with increased intervention rate. Their findings support the use of upfront chemotherapy as initial management for patients with synchronous stage IV CRC without obstruction or bleeding from the primary site.
The ongoing perspective phase II study, NSABP C-10, will provide more data in the upfront nonsurgical approach . C-10 has been activated since March 2006, and plans to enroll 90 patients with unresectable stage IV colon cancer and synchronous asymptomatic primary tumor. Patients are treated with bevacizumab and FOLFOX without prophylactic resection of the primary tumor. The primary objective is the rate of primary tumor-related events (i.e. obstruction, perforation, fistula, and hemorrhage) that necessitate surgery.
We have discussed important presentations in gastrointestinal oncology from 2009 annual meeting of ASCO. The key findings are summarized as the followings, and will lead to paradigm change in clinical practice. Adding trastuzumab to chemotherapy improved the survival of patients with advanced gastric cancer overexpressing HER2. Gemcitabine plus cisplatin has become a new standard for first-line treatment of advanced biliary cancer. Octreotide LAR significantly lengthened median time to tumor progression compared with placebo in patients with metastatic neuroendocrine tumors of the midgut. In patients with resected stage II colon cancer, recurrence score estimated by multigene RT-PCR assay has been shown to provide additional risk stratification. In stage IV CRC, data have supported the routine use of prophylactic skin treatment including oral antibiotics in patients receiving epidermal growth factor receptor antibody, and the use of upfront chemotherapy as initial management in patients with synchronous metastasis without obstruction or bleeding from the primary site.
- Coussens L, Yang-Feng TL, Liao YC, Chen E, Gray A, McGrath J, Seeburg PH, Libermann TA, Schlessinger J, Francke U: Tyrosine kinase receptor with extensive homology to EGF receptor shares chromosomal location with neu oncogene. Science. 1985, 230 (4730): 1132-1139. 10.1126/science.2999974.View ArticlePubMed
- Normanno N, De Luca A, Bianco C, Strizzi L, Mancino M, Maiello MR, Carotenuto A, De Feo G, Caponigro F, Salomon DS: Epidermal growth factor receptor signaling in cancer. Gene. 2006, 366 (1): 2-16. 10.1016/j.gene.2005.10.018.View ArticlePubMed
- Park D, Yun J, Park J, Oh S, Kim H, Cho Y, Sohn C, Jeon W, Kim B, Yoo C: HER-2/neu Amplification Is an Independent Prognostic Factor in Gastric Cancer. Digestive Diseases and Sciences. 2006, 51 (8): 1371-1379. 10.1007/s10620-005-9057-1.View ArticlePubMed
- Kim SY, Kim HP, Kim YJ, Oh do Y, Im SA, Lee D, Jong HS, Kim TY, Bang YJ: Trastuzumab inhibits the growth of human gastric cancer cell lines with HER2 amplification synergistically with cisplatin. Int J Oncol. 2008, 32 (1): 89-95.PubMed
- Tanner M, Hollmen M, Junttila TT, Kapanen AI, Tommola S, Soini Y, Helin H, Salo J, Joensuu H, Sihvo E: Amplification of HER-2 in gastric carcinoma: association with Topoisomerase IIalpha gene amplification, intestinal type, poor prognosis and sensitivity to trastuzumab. Ann Oncol. 2005, 16 (2): 273-278. 10.1093/annonc/mdi064.View ArticlePubMed
- Fujimoto-Ouchi K, Sekiguchi F, Yasuno H, Moriya Y, Mori K, Tanaka Y: Antitumor activity of trastuzumab in combination with chemotherapy in human gastric cancer xenograft models. Cancer Chemotherapy and Pharmacology. 2007, 59 (6): 795-805. 10.1007/s00280-006-0337-z.View ArticlePubMed
- Cortes-Funes H, Rivera F, Ales I, Marquez A, Velasco A, Colomer R, Garcia-Carbonero R, Sastre J, Guerra J, Gravalos C: Phase II of trastuzumab and cisplatin in patients with advanced gastric cancer with HER2/neu overexpression/amplification. J Clin Oncol (Meeting Abstracts). 2007, 25 (18_suppl): 4613-
- Gravalos C, Jimeno A: HER2 in gastric cancer: a new prognostic factor and a novel therapeutic target. Ann Oncol. 2008, 19 (9): 1523-1529. 10.1093/annonc/mdn169.View ArticlePubMed
- Van Cutsem E, Kang Y, Chung H, Shen L, Sawaki A, Lordick F, Hill J, Lehle M, Feyereislova A, Bang Y: Efficacy results from the ToGA trial: A phase III study of trastuzumab added to standard chemotherapy in first-line human epidermal growth factor receptor 2-positive advanced gastric cancer. J Clin Oncol (Meeting Abstracts). 2009, 27 (15S): LBA4509-
- Bang Y, Chung H, Xu J, Lordick F, Sawaki A, Al-Sakaff N, Lipatov O, See C, Rueschoff J, Van Cutsem E: Pathological features of advanced gastric cancer: Relationship to human epidermal growth factor receptor 2 positivity in the global screening programme of the ToGA trial. J Clin Oncol (Meeting Abstracts). 2009, 27 (15S): 4556-
- Kanzler S, Trarbach T, Seufferlein T, Kubicka S, Lordick F, Geissler M, Daum S, Galle PR, Moehler M, German Arbeitsgemeinschaft Internistische O: Cetuximab with irinotecan/folinic acid/5-FU as first-line treatment in advanced gastric cancer: A nonrandomized multicenter AIO phase II study. J Clin Oncol (Meeting Abstracts). 2009, 27 (15S): 4534-
- Kelsen D, Jhawer M, Ilson D, Tse A, Randazzo J, Robinson E, Capanu M, Shah MA: Analysis of survival with modified docetaxel, cisplatin, fluorouracil, and bevacizumab in patients with metastatic gastroesophageal adenocarcinoma: Results of a phase II clinical trial. J Clin Oncol (Meeting Abstracts). 2009, 27 (15S): 4512-
- Woell E, Greil R, Eisterer W, Fridrik M, Grunberger B, Zabernigg A, Mayrbaurl B, Russ G, Thaler J: Oxaliplatin, irinotecan, and cetuximab in advanced gastric cancer. First efficacy results of a multicenter phase II trial (AGMT Gastric-2) of the Arbeitsgemeinschaft Medikamentoese Tumortherapie. J Clin Oncol (Meeting Abstracts). 2009, 27 (15S): 4538-
- Sakuramoto S, Sasako M, Yamaguchi T, Kinoshita T, Fujii M, Nashimoto A, Furukawa H, Nakajima T, Ohashi Y, Imamura H: Adjuvant chemotherapy for gastric cancer with S-1, an oral fluoropyrimidine. N Engl J Med. 2007, 357 (18): 1810-1820. 10.1056/NEJMoa072252.View ArticlePubMed
- Ajani JA, Rodriquez W, Bodoky G, Moiseyenko V, Lichinitser M, Gorbunova V, Vynnychenko I, Garin A, Lang I, Falcon S: Multicenter phase III comparison of cisplatin/S-1 with cisplatin/5-FU as first-line therapy in patients with advanced gastric cancer (FLAGS): Secondary and subset analyses. J Clin Oncol (Meeting Abstracts). 2009, 27 (15S): 4511-
- Fuse N, Fukuda H, Yamada Y, Sawaki A, Koizumi W, Suzuki Y, Yamaguchi K, Takiuchi H, Ohtsu A, Boku N: Updated results of randomized phase III study of 5-fluorouracil alone versus combination of irinotecan and cisplatin versus S-1 alone in advanced gastric cancer (JCOG 9912). J Clin Oncol (Meeting Abstracts). 2009, 27 (15S): 4514-
- Leichman L, Goldman BH, Benedetti JK, Billingsley KG, Thomas CR, Iqbal S, Lenz H, Blanke C, Gold PJ, Corless CL: Oxaliplatin plus protracted infusion 5-fluorouracil and external beam radiation prior to surgery for potentially curable esophageal adenocarcinoma: A Southwest Oncology Group phase II trial with molecular correlates (S0356). J Clin Oncol (Meeting Abstracts). 2009, 27 (15S): 4513-
- Schuhmacher C, Schlag P, Lordick F, Hohenberger W, Heise J, Haag C, Gretschel S, Mauer ME, Lutz M, Siewert JR: Neoadjuvant chemotherapy versus surgery alone for locally advanced adenocarcinoma of the stomach and cardia: Randomized EORTC phase III trial #40954. J Clin Oncol (Meeting Abstracts). 2009, 27 (15S): 4510-
- Cunningham D, Allum WH, Stenning SP, Thompson JN, Velde Van de CJH, Nicolson M, Scarffe JH, Lofts FJ, Falk SJ, Iveson TJ: Perioperative Chemotherapy versus Surgery Alone for Resectable Gastroesophageal Cancer. N Engl J Med. 2006, 355 (1): 11-20. 10.1056/NEJMoa055531.View ArticlePubMed
- Luketich J, Pennathur A, Catalano PJ, Swanson SJ, de Hoyos AL, Maddaus MA, Nguyen N, Benson AB, Fernando HC: Results of a phase II multicenter study of minimally invasive esophagectomy (Eastern Cooperative Oncology Group Study E2202). J Clin Oncol (Meeting Abstracts). 2009, 27 (15S): 4516-
- Valle JW, Wasan H, Johnson P, Jones E, Dixon L, Swindell R, Baka S, Maraveyas A, Corrie P, Falk S: Gemcitabine alone or in combination with cisplatin in patients with advanced or metastatic cholangiocarcinomas or other biliary tract tumours: a multicentre randomised phase II study - The UK ABC-01 Study. Br J Cancer. 2009, 101 (4): 621-627. 10.1038/sj.bjc.6605211.PubMed CentralView ArticlePubMed
- Valle JW, Wasan HS, Palmer DD, Cunningham D, Anthoney DA, Maraveyas A, Hughes SK, Roughton M, Bridgewater JA: Gemcitabine with or without cisplatin in patients with advanced or metastatic biliary tract cancer: Results of a multicenter, randomized phase III trial (the UK ABC-02 trial). J Clin Oncol (Meeting Abstracts). 2009, 27 (15S): 4503-
- Malka D, Trarbach T, Fartoux L, Mendiboure J, de la Fouchardiere C, Viret F, Assenat E, Boucher E, Rosmorduc O, Greten T: A multicenter, randomized phase II trial of gemcitabine and oxaliplatin alone or in combination with biweekly cetuximab in the first-line treatment of advanced biliary cancer: Interim analysis of the BINGO trial. J Clin Oncol (Meeting Abstracts). 2009, 27 (15S): 4520-
- Zhu AX, Meyerhardt JA, Blaszkowsky LS, Muzikansky A, Abrams TA, Chan JA, Enzinger PC, Bhargava P, Kwak EL, Sahani DV: Phase II and fluorodeoxyglucose positron emission tomography study in patients with advanced biliary tract cancers receiving bevacizumab in combination with gemcitabine and oxaliplatin. J Clin Oncol (Meeting Abstracts). 2009, 27 (15S): 4578-
- Zhu AX, Meyerhardt JA, Blaszkowsky LS, Kambadakone AR, Muzikansky A, Zheng H, Clark JW, Abrams TA, Chan JA, Enzinger PC: Efficacy and safety of gemcitabine, oxaliplatin, and bevacizumab in advanced biliary-tract cancers and correlation of changes in 18-fluorodeoxyglucose PET with clinical outcome: a phase 2 study. Lancet Oncol. 2010, 11 (1): 48-54. 10.1016/S1470-2045(09)70333-X.View ArticlePubMed
- Lencioni R, Malagari K, Vogl T, Pilleul F, Denys A, Watkinson A, Lammer J: A randomized phase II trial of a drug eluting bead in the treatment of hepatocellular carcinoma by transcatheter arterial chemoembolization. J Clin Oncol (Meeting Abstracts). 2009, 27 (15S): 4523-
- Martin RC, Robbins K, Tomalty D, O'Hara R, Bosnjakovic P, Padr R, Rocek M, Slauf F, Scupchenko A, Tatum C: Transarterial chemoembolisation (TACE) using irinotecan-loaded beads for the treatment of unresectable metastases to the liver in patients with colorectal cancer: an interim report. World J Surg Oncol. 2009, 7: 80-10.1186/1477-7819-7-80.PubMed CentralView ArticlePubMed
- de Baere T, Deschamps F, Teriitheau C, Rao P, Conengrapht K, Schlumberger M, Leboulleux S, Baudin E, Hechellhammer L: Transarterial chemoembolization of liver metastases from well differentiated gastroenteropancreatic endocrine tumors with doxorubicin-eluting beads: preliminary results. J Vasc Interv Radiol. 2008, 19 (6): 855-861. 10.1016/j.jvir.2008.01.030.View ArticlePubMed
- Llovet JM, Ricci S, Mazzaferro V, Hilgard P, Gane E, Blanc JF, de Oliveira AC, Santoro A, Raoul JL, Forner A: Sorafenib in advanced hepatocellular carcinoma. N Engl J Med. 2008, 359 (4): 378-390. 10.1056/NEJMoa0708857.View ArticlePubMed
- Kaseb AO, Iwasaki M, Javle M, Onicescu G, Garrett-Mayer E, Abbruzzese JL, Thomas MB: Biological activity of bevacizumab and erlotinib in patients with advanced hepatocellular carcinoma. J Clin Oncol (Meeting Abstracts). 2009, 27 (15S): 4522-
- Raoul JL, Finn RS, Kang YK, Park JW, Harris R, Coric V, Donica M, Walters I: An open-label phase II study of first- and second-line treatment with brivanib in patients with hepatocellular carcinoma. J Clin Oncol (Meeting Abstracts). 2009, 27 (15S): 4577-
- Kalser MH, Ellenberg SS: Pancreatic cancer. Adjuvant combined radiation and chemotherapy following curative resection. Arch Surg. 1985, 120 (8): 899-903.View ArticlePubMed
- Chu QD, Khushalani N, Javle MM, Douglass HO, Gibbs JF: Should adjuvant therapy remain the standard of care for patients with resected adenocarcinoma of the pancreas?. Ann Surg Oncol. 2003, 10 (5): 539-545. 10.1245/ASO.2003.06.015.View ArticlePubMed
- Oettle H, Post S, Neuhaus P, Gellert K, Langrehr J, Ridwelski K, Schramm H, Fahlke J, Zuelke C, Burkart C: Adjuvant Chemotherapy With Gemcitabine vs Observation in Patients Undergoing Curative-Intent Resection of Pancreatic Cancer: A Randomized Controlled Trial. JAMA. 2007, 297 (3): 267-277. 10.1001/jama.297.3.267.View ArticlePubMed
- Neoptolemos J, Buchler M, Stocken DD, Ghaneh P, Smith D, Bassi C, Moore M, Cunningham D, Dervenis C, Goldstein D: ESPAC-3(v2): A multicenter, international, open-label, randomized, controlled phase III trial of adjuvant 5-fluorouracil/folinic acid versus gemcitabine in patients with resected pancreatic ductal adenocarcinoma. J Clin Oncol (Meeting Abstracts). 2009, 27 (15S): LBA4505-
- Riess H, Pelzer U, Deutschinoff G, Opitz B, Stauch M, Reitzig P, Hahnfeld S, Hilbig A, Stieler J, Oettle H: A prospective, randomized trial of chemotherapy with or without the low molecular weight heparin enoxaparin in patients (pts) with advanced pancreatic cancer: Results of the CONKO 004 trial. J Clin Oncol (Meeting Abstracts). 2009, 27 (15S): LBA4506-
- Von Hoff DD, Ramanathan R, Borad M, Laheru D, Smith L, Wood T, Korn R, Desai N, Iglesias J, Hidalgo M: SPARC correlation with response to gemcitabine plus nab-paclitaxel in patients with advanced metastatic pancreatic cancer: A phase I/II study. J Clin Oncol (Meeting Abstracts). 2009, 27 (15S): 4525-
- Loehr M, Bodoky G, Folsch U, Marten A, Karrasch M, Lilla C, Meyer I, Osinsky D, Szanto J, Lutz M: Cationic liposomal paclitaxel in combination with gemcitabine in patients with advanced pancreatic cancer: A phase II trial. J Clin Oncol (Meeting Abstracts). 2009, 27 (15S): 4526-
- Shroff RT, Javle MM, Dong X, Kumar VS, Krishnan S, Wolff RA, Abbruzzese JL, Li D: The prognostic value of polymorphisms in the insulin-like growth factor receptor pathway in patients with locally advanced pancreatic cancer. J Clin Oncol (Meeting Abstracts). 2009, 27 (15S): 4500-
- Arnold R, Muller H, Schade-Brittinger C, Rinke A, Klose K, Barth P, Wied M, Mayer C, Aminossadati B, Group PS: Placebo-controlled, double-blind, prospective, randomized study of the effect of octreotide LAR in the control of tumor growth in patients with metastatic neuroendocrine midgut tumors: A report from the PROMID study group. J Clin Oncol (Meeting Abstracts). 2009, 27 (15S): 4508-
- Rinke A, Muller HH, Schade-Brittinger C, Klose KJ, Barth P, Wied M, Mayer C, Aminossadati B, Pape UF, Blaker M: Placebo-controlled, double-blind, prospective, randomized study on the effect of octreotide LAR in the control of tumor growth in patients with metastatic neuroendocrine midgut tumors: a report from the PROMID Study Group. J Clin Oncol. 2009, 27 (28): 4656-4663. 10.1200/JCO.2009.22.8510.View ArticlePubMed
- Flam M, John M, Pajak TF, Petrelli N, Myerson R, Doggett S, Quivey J, Rotman M, Kerman H, Coia L: Role of mitomycin in combination with fluorouracil and radiotherapy, and of salvage chemoradiation in the definitive nonsurgical treatment of epidermoid carcinoma of the anal canal: results of a phase III randomized intergroup study. J Clin Oncol. 1996, 14 (9): 2527-2539.PubMed
- Bartelink H, Roelofsen F, Eschwege F, Rougier P, Bosset JF, Gonzalez DG, Peiffert D, van Glabbeke M, Pierart M: Concomitant radiotherapy and chemotherapy is superior to radiotherapy alone in the treatment of locally advanced anal cancer: results of a phase III randomized trial of the European Organization for Research and Treatment of Cancer Radiotherapy and Gastrointestinal Cooperative Groups. J Clin Oncol. 1997, 15 (5): 2040-2049.PubMed
- Ajani JA, Winter KA, Gunderson LL, Pedersen J, Benson AB, Thomas CR, Mayer RJ, Haddock MG, Rich TA, Willett C: Fluorouracil, mitomycin, and radiotherapy vs fluorouracil, cisplatin, and radiotherapy for carcinoma of the anal canal: a randomized controlled trial. JAMA. 2008, 299 (16): 1914-1921. 10.1001/jama.299.16.1914.View ArticlePubMed
- Gerard JP, Ayzac L, Hun D, Romestaing P, Coquard R, Ardiet JM, Mornex F: Treatment of anal canal carcinoma with high dose radiation therapy and concomitant fluorouracil-cisplatinum. Long-term results in 95 patients. Radiother Oncol. 1998, 46 (3): 249-256. 10.1016/S0167-8140(97)00192-8.View ArticlePubMed
- Hung A, Crane C, Delclos M, Ballo M, Ajani J, Lin E, Feig B, Skibber J, Janjan N: Cisplatin-based combined modality therapy for anal carcinoma: a wider therapeutic index. Cancer. 2003, 97 (5): 1195-1202. 10.1002/cncr.11161.View ArticlePubMed
- Glynne-Jones R, Harrison M, Mawdsley S: In Reply. J Clin Oncol. 2009, 27 (1): 163-164. 10.1200/JCO.2008.19.8739.View Article
- James R, Wan S, Glynne-Jones R, Sebag-Montefiore D, Kadalayil L, Northover J, Cunningham D, Meadows H, Ledermann J, National Cancer Research Institute ACTIITMG: A randomized trial of chemoradiation using mitomycin or cisplatin, with or without maintenance cisplatin/5FU in squamous cell carcinoma of the anus (ACT II). J Clin Oncol (Meeting Abstracts). 2009, 27 (18S): LBA4009-
- Gerard J-P, Conroy T, Bonnetain F, Bouche O, Chapet O, Closon-Dejardin M-T, Untereiner M, Leduc B, Francois E, Maurel J: Preoperative Radiotherapy With or Without Concurrent Fluorouracil and Leucovorin in T3-4 Rectal Cancers: Results of FFCD 9203. J Clin Oncol. 2006, 24 (28): 4620-4625. 10.1200/JCO.2006.06.7629.View ArticlePubMed
- Bosset JF, Collette L, Calais G, Mineur L, Maingon P, Radosevic-Jelic L, Daban A, Bardet E, Beny A, Ollier JC: Chemotherapy with preoperative radiotherapy in rectal cancer. N Engl J Med. 2006, 355 (11): 1114-1123. 10.1056/NEJMoa060829.View ArticlePubMed
- Aschele C, Friso ML, Pucciarelli S, Lonardi S, Sartor L, Fabris G, Urso EDL, Del Bianco P, Sotti G, Lise M: A phase I-II study of weekly oxaliplatin, 5-fluorouracil continuous infusion and preoperative radiotherapy in locally advanced rectal cancer. Ann Oncol. 2005, 16 (7): 1140-1146. 10.1093/annonc/mdi212.View ArticlePubMed
- Machiels JP, Duck L, Honhon B, Coster B, Coche JC, Scalliet P, Humblet Y, Aydin S, Kerger J, Remouchamps V: Phase II study of preoperative oxaliplatin, capecitabine and external beam radiotherapy in patients with rectal cancer: the RadiOxCape study. Ann Oncol. 2005, 16 (12): 1898-1905. 10.1093/annonc/mdi406.View ArticlePubMed
- NSABP protocol R-04: A clinical trial comparing preoperative radiation therapy and capecitabine with or without oxaliplatin with preoperative radiation therapy and continuous intravenous infusion of 5-fluorouracil with or without oxaliplatin in the treatment of patients with operable carcinoma of the rectum. [http://www.nsabp.pitt.edu/R04_Information.asp]
- Aschele C, Pinto C, Cordio S, Rosati G, Tagliagambe A, Artale S, Rosetti P, Lonardi S, Boni L, Cionini L: Preoperative fluorouracil-based chemoradiation with and without weekly oxaliplatin in locally advanced rectal cancer: Pathologic response analysis of the Studio Terapia Adiuvante Retto (STAR)-01 randomized phase III trial. J Clin Oncol (Meeting Abstracts). 2009, 27 (18S): CRA4008-
- Gerard J, Azria D, Gourgou-Bourgade S, Martel-Laffay I, Hennequin C, Etienne P, Vendrely V, Conroy T, Francois E, Montoto-Grillot C: Randomized multicenter phase III trial comparing two neoadjuvant chemoradiotherapy regimens (RT45-Cap versus RT50-Capox) in patients with locally advanced rectal cancer: Results of the ACCORD 12/0405 PRODIGE 2. J Clin Oncol (Meeting Abstracts). 2009, 27 (18S): LBA4007-
- Javle M, Hsueh CT: Updates in Gastrointestinal Oncology - insights from the 2008 44th annual meeting of the American Society of Clinical Oncology. J Hematol Oncol. 2009, 2: 9-10.1186/1756-8722-2-9.PubMed CentralView ArticlePubMed
- Wolmark N, Yothers G, O'Connell MJ, Sharif S, Atkins JN, Seay TE, Feherenbacher L, O'Reilly S, Allegra CJ: A phase III trial comparing mFOLFOX6 to mFOLFOX6 plus bevacizumab in stage II or III carcinoma of the colon: Results of NSABP Protocol C-08. J Clin Oncol (Meeting Abstracts). 2009, 27 (18S): LBA4-
- Phase III randomized study of adjuvant oxaliplatin, leucovorin calcium, and fluorouracil (FOLFOX-4) versus bevacizumab and FOLFOX-4 versus bevacizumab, oxaliplatin, and capecitabine in patients with high-risk stage II or stage III colon cancer. [http://www.cancer.gov/clinicaltrials/UCLA-0412086-01]
- Taieb J, Laurent-Puig P, Alberts S: Incidence of KRAS status in ongoing adjuvant trials in colon cancer. Current Colorectal Cancer Reports. 2009, 5 (3): 171-178. 10.1007/s11888-009-0025-6.View Article
- Benson AB, Schrag D, Somerfield MR, Cohen AM, Figueredo AT, Flynn PJ, Krzyzanowska MK, Maroun J, McAllister P, Van Cutsem E: American Society of Clinical Oncology Recommendations on Adjuvant Chemotherapy for Stage II Colon Cancer. J Clin Oncol. 2004, 22 (16): 3408-3419. 10.1200/JCO.2004.05.063.View ArticlePubMed
- Efficacy of Adjuvant Fluorouracil and Folinic Acid in B2 Colon Cancer. J Clin Oncol. 1999, 17 (5): 1356-
- Quasar Collaborative G, Gray R, Barnwell J, McConkey C, Hills RK, Williams NS, Kerr DJ: Adjuvant chemotherapy versus observation in patients with colorectal cancer: a randomised study. Lancet. 2007, 370 (9604): 2020-2029. 10.1016/S0140-6736(07)61866-2.View Article
- Marshall JL, Haller DG, de Gramont A, Hochster HS, Lenz HJ, Ajani JA, Goldberg RM: Adjuvant Therapy for Stage II and III Colon Cancer: Consensus Report of the International Society of Gastrointestinal Oncology. Gastrointest Cancer Res. 2007, 1 (4): 146-154.PubMed CentralPubMed
- Ribic CM, Sargent DJ, Moore MJ, Thibodeau SN, French AJ, Goldberg RM, Hamilton SR, Laurent-Puig P, Gryfe R, Shepherd LE: Tumor microsatellite-instability status as a predictor of benefit from fluorouracil-based adjuvant chemotherapy for colon cancer. N Engl J Med. 2003, 349 (3): 247-257. 10.1056/NEJMoa022289.PubMed CentralView ArticlePubMed
- Watanabe T, Wu T-T, Catalano PJ, Ueki T, Satriano R, Haller DG, Benson AB, Hamilton SR: Molecular Predictors of Survival after Adjuvant Chemotherapy for Colon Cancer. N Engl J Med. 2001, 344 (16): 1196-1206. 10.1056/NEJM200104193441603.PubMed CentralView ArticlePubMed
- Benson AB: New Approaches to Assessing and Treating Early-Stage Colon and Rectal Cancers: Cooperative Group Strategies for Assessing Optimal Approaches in Early-Stage Disease. Clin Cancer Res. 2007, 13 (22): 6913s-6920. 10.1158/1078-0432.CCR-07-1188.View ArticlePubMed
- Bertagnolli MM, Niedzwiecki D, Hall M, Jewell SD, Mayer RJ, Goldberg RM, Colacchio TA, Warren RS, Redston M: Presence of 18q loss of heterozygosity and disease-free and overall survival in stage II colon cancer: CALGB Protocol 9581. J Clin Oncol (Meeting Abstracts). 2009, 27 (15S): 4012-
- Kerr D, Gray R, Quirke P, Watson D, Yothers G, Lavery IC, Lee M, O'Connell MJ, Shak S, Wolmark N: A quantitative multigene RT-PCR assay for prediction of recurrence in stage II colon cancer: Selection of the genes in four large studies and results of the independent, prospectively designed QUASAR validation study. J Clin Oncol (Meeting Abstracts). 2009, 27 (15S): 4000-
- Cronin M, Pho M, Dutta D, Stephans JC, Shak S, Kiefer MC, Esteban JM, Baker JB: Measurement of gene expression in archival paraffin-embedded tissues: development and performance of a 92-gene reverse transcriptase-polymerase chain reaction assay. Am J Pathol. 2004, 164 (1): 35-42.PubMed CentralView ArticlePubMed
- Roth AD, Tejpar S, Yan P, Fiocca R, Dietrich D, Delorenzi M, Labianca R, Cunningham D, Van Cutsem E, Bosman F: Stage-specific prognostic value of molecular markers in colon cancer: Results of the translational study on the PETACC 3-EORTC 40993-SAKK 60-00 trial. J Clin Oncol (Meeting Abstracts). 2009, 27 (15S): 4002-
- Tejpar S, Bosman F, Delorenzi M, Fiocca R, Yan P, Klingbiel D, Dietrich D, Van Cutsem E, Labianca R, Roth A: Microsatellite instability (MSI) in stage II and III colon cancer treated with 5FU-LV or 5FU-LV and irinotecan (PETACC 3-EORTC 40993-SAKK 60/00 trial). J Clin Oncol (Meeting Abstracts). 2009, 27 (15S): 4001-
- Van Cutsem E, Labianca R, Bodoky G, Barone C, Aranda E, Nordlinger B, Topham C, Tabernero J, Andre T, Sobrero AF: Randomized phase III trial comparing biweekly infusional fluorouracil/leucovorin alone or with irinotecan in the adjuvant treatment of stage III colon cancer: PETACC-3. J Clin Oncol. 2009, 27 (19): 3117-3125. 10.1200/JCO.2008.21.6663.View ArticlePubMed
- Bertagnolli MM, Niedzwiecki D, Compton CC, Hahn HP, Hall M, Damas B, Jewell SD, Mayer RJ, Goldberg RM, Saltz LB: Microsatellite Instability Predicts Improved Response to Adjuvant Therapy With Irinotecan, Fluorouracil, and Leucovorin in Stage III Colon Cancer: Cancer and Leukemia Group B Protocol 89803. J Clin Oncol. 2009, 27 (11): 1814-1821. 10.1200/JCO.2008.18.2071.PubMed CentralView ArticlePubMed
- Mitchell EP, Lacouture M, Shearer H, Iannotti N, Piperdi B, Pillai M, Xu F, Yassine M: Final STEPP results of prophylacatic versus reactive skin toxicity (ST) treatment for panitumumab-related ST in patients with metastatic colorectal cancer. J Clin Oncol (Meeting Abstracts). 2009, 27 (18S): CRA4027-
- Eisenberger A, Whelan RL, Neugut AI: Survival and symptomatic benefit from palliative primary tumor resection in patients with metastatic colorectal cancer: a review. Int J Colorectal Dis. 2008, 23 (6): 559-568. 10.1007/s00384-008-0456-6.View ArticlePubMed
- Tebbutt NC, Norman AR, Cunningham D, Hill ME, Tait D, Oates J, Livingston S, Andreyev J: Intestinal complications after chemotherapy for patients with unresected primary colorectal cancer and synchronous metastases. Gut. 2003, 52 (4): 568-573. 10.1136/gut.52.4.568.PubMed CentralView ArticlePubMed
- Scoggins CR, Meszoely IM, Blanke CD, Beauchamp RD, Leach SD: Nonoperative management of primary colorectal cancer in patients with stage IV disease. Ann Surg Oncol. 1999, 6 (7): 651-657. 10.1007/s10434-999-0651-x.View ArticlePubMed
- Poultsides GA, Servais EL, Saltz LB, Patil S, Kemeny NE, Guillem JG, Weiser M, Temple LK, Wong W, Paty PB: Outcome of primary tumor in patients with synchronous stage IV colorectal cancer receiving combination chemotherapy without surgery as initial treatment. J Clin Oncol (Meeting Abstracts). 2009, 27 (18S): CRA4030-
- NSABP protocol C-10: A phase II trial of 5-fluorouracil, leucovorin, and oxaliplatin (mFOLFOX6) chemotherapy plus bevacizumab for patients with unresectable stage IV colon cancer and a synchronous asymptomatic primary tumor. [http://www.nsabp.pitt.edu/C10_Information.asp]
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