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Targeted therapy in lymphoma

Journal of Hematology & Oncology volume 3, Article number: 45 (2010) Cite this article

Abstract

Discovery of new treatments for lymphoma that prolong survival and are less toxic than currently available agents represents an urgent unmet need. We now have a better understanding of the molecular pathogenesis of lymphoma, such as aberrant signal transduction pathways, which have led to the discovery and development of targeted therapeutics. The ubiquitin-proteasome and the Akt/mammalian target of rapamycin (mTOR) pathways are examples of pathological mechanisms that are being targeted in drug development efforts. Bortezomib (a small molecule protease inhibitor) and the mTOR inhibitors temsirolimus, everolimus, and ridaforolimus are some of the targeted therapies currently being studied in the treatment of aggressive, relapsed/refractory lymphoma. This review will discuss the rationale for and summarize the reported findings of initial and ongoing investigations of mTOR inhibitors and other small molecule targeted therapies in the treatment of lymphoma.

Introduction

Despite remarkable advances in diagnosis and treatment, lymphoma continues to rank as a leading cause of cancer-related mortality. Recent cancer statistics for the United States project non-Hodgkin lymphoma (NHL) to be the sixth most commonly diagnosed cancer in 2010 in both men and women, and the eighth and sixth leading cause of cancer-related death in men and women, respectively [1]. Based on data from national cancer registries, 65,540 new cases of NHL and 20,210 deaths from NHL are estimated to occur in 2010. In contrast, Hodgkin lymphoma (HL) is less common (8,490 estimated new cases in 2010) and is associated with fewer deaths (1,320 estimated deaths in 2010) [1]. In the European Union, reported NHL estimates for the year 2006 were even higher, with 72,800 new cases and 33,000 deaths [2].

Current treatments for NHL are not optimally effective, with relapse and resistance to chemotherapy common and the risk of secondary malignancies an ongoing concern. Long-term prognosis in patients who relapse with aggressive NHL, such as diffuse large B-cell lymphoma (DLBCL) and mantle cell lymphoma (MCL), after induction therapy typically is dismal [3, 4]. Discovery of new treatments that prolong survival and are less toxic represents an urgent unmet medical need. Intensive research efforts that were focused on better understanding the molecular pathogenesis of lymphoma have paved the way toward identifying and testing targeted therapeutics [5].

Delineation of signal transduction mechanisms involved in the pathogenesis of lymphoma has revealed new therapeutic targets for clinical investigation (Table 1) [6–14]. For example, the ubiquitin-proteasome signaling pathway, which is a fundamental component of cellular proliferation and survival, mediates the degradation of proteins involved in the regulation of cell growth [15]. The proteasome activates nuclear factor-κB (NF-κB) signaling by degrading IκB kinase (eg, the NF-κB inhibitory protein), resulting in the promotion of tumor growth and metastasis [15]. Elucidation of this regulatory signaling pathway identified IκB kinase as a molecular target for development of drugs with activity against lymphoma. Bortezomib (Velcade®) is the prototype small-molecule protease inhibitor that is approved for the treatment of relapsed/refractory MCL and multiple myeloma [15, 16].

Table 1 Investigational therapeutic targets in lymphoma treatment
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The phosphoinositide 3-kinase (PI3K)/Akt signaling pathway (Figure 1) is another important signal transduction pathway that is aberrantly activated in various different types of cancer, including many hematologic malignancies [8]. PI3K is a lipid kinase that is activated by a variety of cellular input signals, such as growth factor receptor tyrosine kinase stimulation. Activated PI3K enables recruitment of the serine/threonine kinase Akt to the cell membrane where it undergoes phosphorylation. Phosphorylated Akt subsequently activates several other intracellular signaling proteins [8]. One downstream target of Akt is the mammalian target of rapamycin (mTOR), a cytoplasmic serine/threonine kinase that, when activated, promotes mRNA translation and protein synthesis, resulting in the regulation of cell growth and proliferation, cellular metabolism, and angiogenesis [8]. The mTOR pathway is aberrantly activated in many hematologic malignancies, including some forms of NHL and HL [8–10]. The mTOR inhibitors everolimus (Afinitor®) and temsirolimus (Torisel®) are currently under clinical investigation for the treatment of NHL and HL, and ridaforolimus (formerly deforolimus) is being evaluated in patients with hematological malignancies including lymphoma.

Figure 1
figure 1

The PI3K/Akt signaling pathway. Reprinted with permission from Altman JK, Platanias LC: Exploiting the mammalian target of rapamycin pathway in hematologic malignancies. Curr Opin Hematol. 2008, 15:88-94.

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Other investigational targeted therapies are of interest in the treatment of NHL and HL (Table 1). Lenalidomide (Revlimid®) is a derivative of thalidomide that is approved for use in combination with dexamethasone for the treatment of previously treated multiple myeloma [17]. Lenalidomide is currently being investigated in a variety of solid tumors and other hematologic malignancies, including lymphoma [17]. While the exact mechanism is not known, lenalidomide is believed to exert anti-metastatic, anti-proliferative, and immunomodulatory activities [11, 17]. Sunitinib (Sutent®) and sorafenib (Nexavar®) are tyrosine kinase inhibitors that interrupt tumor proliferation and angiogenesis by inhibiting vascular endothelial growth factor (VEGF) and platelet-derived growth factor (PDGF) receptors [12, 13]. The histone deacetylase inhibitors (Table 1) represent an emerging therapeutic approach that targets aberrant gene expression, putatively blocking the development of malignant phenotypes (eg, epigenetic therapy) [14, 18]. Histones are structural proteins involved in the expression of genes that regulate tumor cell differentiation and apoptosis [14, 18]. Vorinostat (Zolinza®), romidepsin (FK228), valproic acid, and panobinostat (LBH589) are some of the histone deacetylase inhibitors (HDACIs) currently being investigated for clinical activity [14, 18, 19].

Herein we review the experience with targeted treatments for lymphoma that have advanced from phase I to phase III clinical trials. We will focus our discussion primarily on published data in NHL, including MCL and DLBCL. It is hoped that the wealth of information being discovered in the molecular pathogenesis of lymphoma and the development of targeted therapeutics for these aberrant pathways will identify highly specific, less toxic agents for the treatment of lymphomas.

Small-molecule proteasome inhibitors

The clinical trial experience to date for bortezomib treatment of lymphoma includes studies of mixed lymphoma populations and studies that limited enrollment to patients with MCL, DLBCL, or HL (Table 2) [20–33].

Table 2 Clinical trial experience with bortezomib in lymphoma
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Relapsed/refractory mantle cell lymphoma

Three phase II studies evaluated the safety and anti-tumor response of bortezomib in a total of 125 evaluable patients with various relapsed/refractory lymphomas (Table 2). Patients were heavily pretreated and had relapsed disease or tumors that were refractory to their most recent therapies. Roughly half (n = 63) of the evaluable patients in these 3 studies had MCL. Bortezomib was administered as monotherapy using a 21-day dosing cycle of 1.5 mg/m2 or 1.3 mg/m2 twice weekly for 2 weeks followed by a 1-week rest [21, 23, 24]. Overall response rates for the 1.5 mg/m2 dose were 50% (1 unconfirmed complete response [uCR]/4 partial responses [PR]) [21] and 41% (6 CR/6 PR) [23]. Of the 24 evaluable patients who were treated with bortezomib 1.3 mg/m2, 29% achieved a measurable clinical response (1 CR/6 PR) [24]. Of 33 patients with MCL in one study, the median time to disease progression was 3.5 months, with an estimated progression-free survival at 6 months of 42% [23].

Three other studies examined the efficacy and safety of bortezomib in cohorts that consisted only of patients with MCL (Table 2). In the PINNACLE trial, bortezomib 1.3 mg/m2 was administered to 141 evaluable patients according to the same 21-day cycle as in earlier studies, and 33% of patients responded to treatment (2 uCR/9 CR/36 PR) [25]. Although the median overall survival was not reached by the data cut-off point, 66% of patients remained alive after a median follow-up period of 13.4 months, and the 1-year survival probability was 94.3% for responding patients and 69.3% for all patients [25]. When the median follow-up was extended to 26.4 months, the median progression-free survival and median time to next treatment were, respectively, 20.3 and 23.9 months (complete responders), 9.7 and 13.3 months (partial responders), and 12.4 and 14.3 months (all responders) [26]. Findings from 2 smaller studies of bortezomib monotherapy in patients with MCL demonstrated overall response rates of 46% [27] and 47% [28].

Based on in vitro data showing synergy between bortezomib and conventional chemotherapy [34], Weigert and associates administered R-HAD+B, which is a novel regimen of bortezomib (1.5 mg/m2 twice weekly every 21 days), high-dose cytarabine, and dexamethasone to 8 patients with advanced MCL (Table 2) [29]. Patients not refractory to prior rituximab regimens also received rituximab on day 0 [29]. Four patients were withdrawn from the study due to lack of response, but the 4 other patients completed 4 treatment cycles and achieved a CR (n = 2) or PR (n = 2) [29].

In addition to the studies combining bortezomib in the relapsed/refractory setting for NHL, 2 recent studies have assessed bortezomib in combination with other agents in previously untreated patients with NHL [20, 35]. Bortezomib has been combined with rituximab, cyclophosphamide, doxorubicin, vincristine, and dexamethasone (VcR-CVAD) in the treatment of patients with untreated MCL in a phase II trial [20]. All patients achieving at least a PR after completing 6 cycles of the VcR-CVAD were offered maintenance rituximab therapy for 5 years. All 30 enrolled patients had completed the induction phase of the VcR-CVAD chemotherapy at the time of reporting. A 90% overall response rate was reported after VcR-CVAD with 77% CR/uCR and 13% PR with 10% of patients experiencing progressive disease during the induction chemotherapy. With a median follow-up of almost 18 months, the 18-month progression-free and overall survival was reported at 73% and 97%, respectively. Another trial incorporated bortezomib in combination with R-CHOP chemotherapy (rituximab, cyclophosphamide, hydroxydaunorubicin, vincristine, prednisone) in a phase I trial in patients with previously untreated aggressive NHL [35]. In this study, standard R-CHOP was given on a 21-day cycle and bortezomib was administered on days 1 and 4 of each cycle at 0.7 mg/m2 (4 patients), 1.0 mg/m2 (9 patients), or 1.3 mg/m2 (7 patients). The histologic subtypes included both MCL and diffuse large B-cell lymphoma (DLBCL). The maximum tolerated dose was not reached and the 1.3 mg/m2 dose was well tolerated. Neuropathy was a common side effect reported in 65% of patients [35].

Combination therapy with bortezomib is being evaluated further in an ongoing open-label, international phase III study. In this study, standard R-CHOP is being compared with a regimen of rituximab, cyclophosphamide, doxorubicin, bortezomib, and prednisone (VcR-CAP) in patients with newly diagnosed MCL who are not eligible for bone marrow transplantation (NCT00722137).

Other lymphomas

Bortezomib monotherapy does not appear to have clinically meaningful anti-tumor activity in DLBCL, but when combined with chemotherapy, 34% of patients in one study responded to treatment (Table 2) [30]. Bortezomib also has been evaluated in patients with relapsed/refractory HL (Table 2), but none achieved a clinical response with bortezomib monotherapy [32] or with bortezomib plus dexamethasone [31]. A minimal clinical response (1 CR/3 PR) was observed with the combination of bortezomib and gemcitabine in 18 patients with DLBCL, but the investigators concluded that this combination should not be pursued due to grade 3/4 hepatotoxicity [33].

Toxicity

Neutropenia and thrombocytopenia are common hematologic toxicities reported during twice-weekly bortezomib treatment [21, 23, 24, 26, 27, 30]. Fatigue, peripheral neuropathy, and gastrointestinal disturbances were the most frequently reported non-hematologic adverse events associated with bortezomib [23, 25–27]. The most common dose-limiting toxicities during treatment of MCL with twice-weekly bortezomib monotherapy (1.3 mg/m2 or 1.5 mg/m2) were peripheral neuropathy, fatigue, and thrombocytopenia [21, 23–25]. All of the 8 patients with advanced MCL who were treated with bortezomib plus high-dose cytarabine and dexamethasone developed grade 3/4 hematologic toxicity, 2 developed grade 3 febrile neutropenia, and 7 required G-CSF rescue [29]. In a continuation of one phase II monotherapy trial [21], Gerecitano and colleagues administered bortezomib monotherapy once-weekly (1.8 mg/m2) and concluded that weekly dosing is less toxic than the twice-weekly schedule but resulted in a lower clinical response rate (2 PR of 8 assessable patients with MCL) (Table 2) [22].

mTOR Inhibitors

The rapamycin analogs everolimus and temsirolimus are mTOR inhibitors that have been approved for treatment of resistant renal cell carcinoma. Everolimus is administered orally, and temsirolimus intravenously. Based on in vitro activity of mTOR inhibitors in numerous lymphoma cell lines [36, 37], both everolimus and temsirolimus have completed phase II clinical trials in NHL. Ridaforolimus and sirolimus are other mTOR inhibitors that also are in clinical testing for the treatment of lymphomas (Table 3) [38–46].

Table 3 Clinical trial experience with mTOR inhibitors in lymphoma
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Relapsed/refractory mantle cell lymphoma

The mTOR inhibitors, everolimus, temsirolimus, and ridaforolimus, have been evaluated in phase I and II trials of patients with relapsed/refractory MCL (Table 3). The efficacy and safety of everolimus monotherapy (10 mg/day for 4-week cycles) was evaluated in a phase II trial of 77 patients with relapsed aggressive NHL, including 19 patients with MCL and 47 patients with DLBCL [38]. The overall response rates were 30% (3 uCR/20 PR) for all patients, 32% for MCL, and 30% for DLBCL [38]. The median duration of response in patients achieving a CR or PR was 5.7 months, and of these patients, 5 remained progression-free at 12 months [38]. Monotherapy with everolimus was first evaluated in a phase I/II trial of 26 heavily pre-treated patients with relapsed or refractory MCL (n = 4) or other hematologic malignancies (n = 23) [39]. Everolimus modulated mTOR signaling in 6 of 9 patient samples within 24 hours as demonstrated by simultaneous inhibition of the downstream effectors, p70S6K and 4E-BP1 [39]. None of the 4 patients with MCL in this cohort achieved a clinical response to everolimus [39].

Temsirolimus has been studied in 2 phase I/II trials and 1 large phase III trial of patients with MCL (Table 3). The response rate to a 250-mg/week course of temsirolimus monotherapy in patients with advanced MCL was 38% (N = 34; 1 CR/12 PR) [40], which was similar to the 41% response rate (N = 27; 1 CR/10 PR) achieved by a similar cohort after treatment with a 10-fold lower dose of temsirolimus (25 mg/week) [41]. However, the 25-mg dose was associated with lower rates of hematologic toxicity, specifically thrombocytopenia [41]. Based on these findings, a large phase III trial of temsirolimus monotherapy was conducted. Patients with heavily pre-treated relapsed/refractory MCL (N = 162) were randomized to open-label treatment with investigator-chosen, pre-approved chemotherapy regimens or 1 of 2 regimens of temsirolimus monotherapy (175 mg/week for 3 weeks followed by either 25-mg or 75-mg weekly) [42]. The overall response rate was 6% for the 25-mg dose and 22% for the 75-mg dose, the latter being significantly higher (p = 0.0019) compared with investigator-chosen treatment (2%) [42]. Median progression-free survival was 3.4 months (25 mg), 4.8 months (75 mg), and 1.9 months (investigator-chosen; p = 0.0009 vs 75 mg) [42].

The anti-tumor activity of ridaforolimus, another intravenously administered mTOR inhibitor, has been evaluated in a phase II study of 52 patients with hematologic malignancies (including 9 patients with MCL) (Table 3) [43]. Patients were treated with ridaforolimus monotherapy 12.5 mg daily for days 1 to 5 every 2 weeks [43]. Of the 9 patients with MCL, 3 achieved a partial response for an overall response rate of 33% [43].

Waldenström macroglobulinemia

A phase II trial of everolimus monotherapy (10 mg/day) was conducted in 50 patients with relapsed or relapsed/refractory Waldenström macroglobulinemia (WM) (Table 3) [44]. After a median treatment duration of 2 months (range: 1 to 10 months), 21 patients (42%) achieved a partial response. No patient had a CR. The median duration of response had not been reached by the time of publication, but 16 of the 21 patients continued to respond after a median 6.6-month follow-up (range: 1 to > 18.2 months) [44].

Hodgkin lymphoma

The anti-tumor activity of everolimus monotherapy (10 mg/day) also was examined in a phase II study of 19 heavily pre-treated patients with relapsed HL (Table 3) [45]. The overall response rate was 47% (1 CR/8 PR), with a median duration of response of 7.1 months [45]. A multicenter trial has begun enrollment in the United States to confirm the activity of everolimus monotherapy in patients with relapsed/refractory HL (NCT01022996).

Graft-versus-host disease

Armand and colleagues conducted a retrospective chart review of patients who underwent allogenic hematopoietic stem-cell transplantation for lymphoma [46]. Patients chosen for inclusion received graft-versus-host disease (GVHD) prophylaxis with the mTOR inhibitor sirolimus (12-mg loading doses on days 1-3 followed by 4 mg daily) or standard GVHD prophylaxis (cyclosporine or tacrolimus alone or in combination with methotrexate). Of 126 patients who received reduced intensity conditioning with sirolimus (n = 103) or with standard regimens (n = 23), the 3-year overall survival rate was 66% (p = 0.007 vs no sirolimus) in the sirolimus arm and 38% in the no-sirolimus group with a corresponding 3-year progression-free survival of 44% (p = 0.001 vs no sirolimus) and 17%, respectively [46].

Diffuse large B-cell lymphoma

As previously noted, everolimus monotherapy has been evaluated in a phase II trial in patients with relapsed/refractory aggressive NHL, including 47 patients with DLBCL who achieved an overall response rate of 30% [38]. Several ongoing investigator-initiated trials are evaluating combining everolimus with other agents in the treatment of NHL. In addition, the PIvotaL Lymphoma triAls of RAD001 (PILLAR-2; NCT00790036), an ongoing phase III maintenance trial of everolimus in poor-risk patients with DLBCL who achieved a CR with R-CHOP chemotherapy, has begun enrolling patients (NCT00790036).

Toxicity

Thrombocytopenia, neutropenia, and anemia are the most commonly reported hematologic toxicities reported during monotherapy with the mTOR inhibitors everolimus, temsirolimus, and ridaforolimus [38–44]. Not surprisingly, thrombocytopenia reported during temsirolimus 250 mg/week (100%) was more common than during treatment with the lower dose of 25 mg/week (39%) [40, 41]. Differences in the rates of thrombocytopenia were less marked for temsirolimus 75-mg weekly (59%) versus 25-mg weekly (52%) [42]. Fatigue, mucositis, hyperglycemia, diarrhea, anorexia/weight loss, and hyperlipidemia are commonly occurring non-hematologic toxicities seen during mTOR inhibitor treatment [38–44]. Thrombocytopenia was a commonly reported reason for treatment delay or dose reduction [38, 40, 41, 45].

Pulmonary toxicity can be observed with mTOR inhibitor therapy. Pulmonary symptoms, such as increased cough, dyspnea, and pleural effusion, have been reported during treatment with both everolimus and temsirolimus [38, 42, 44, 45]. It is difficult to compare rates of pulmonary toxicity for the different mTOR inhibitors given non-standard descriptions of adverse events and the lack of direct, head-to-head studies. Nevertheless, rates of grade 3/4 dyspnea and other pulmonary symptoms were similar for everolimus (21%) and temsirolimus (16%) in 2 monotherapy studies [42, 45]. Pulmonary symptoms associated with mTOR inhibition usually can be managed by interrupting treatment and restarting at a lower dose [38, 44, 45].

Thalidomide Derivatives

The thalidomide derivative, lenalidomide, has been evaluated in a phase II multicenter study in patients with relapsed/refractory aggressive NHL [47]. Open-label treatment consisted of lenalidomide 25 mg daily for the first 21 days of every 28-day cycle; patients continued treatment for 52 weeks unless toxicity or disease progression occurred [47]. Of the 49 evaluable patients, 26 had DLBCL, 15 had MCL, 5 had grade 3 follicular lymphoma, and 3 had transformed low-grade lymphoma [47]. Overall response rates were 35% (4 uCR/2 CR/11 PR) for all 49 patients, 19% for DLBCL (2 uCR/1 CR/2 PR), and 53% for MCL (1 uCR/1 CR/6 PR) [47]. For the entire population of 49 patients, the median duration of response was estimated to be 6.2 months, and the median progression-free survival was 4.0 months [47]. The most common grade 3/4 hematologic toxicities were neutropenia, thrombocytopenia, and leukopenia [47]. Neutropenia, thrombocytopenia, and fatigue were the toxicities most likely to necessitate a reduction in dose [47].

Trial investigators updated the clinical outcome of the 15 patients with MCL [48]. The overall response rate remained at 53% (3 CR/5 PR), with 1 patient converting from a partial response to a complete response [48]. The median duration of response for the patients with MCL in the updated report was 13.7 months with a median progression-free survival of 5.6 months [48]. Hematologic and dose-limiting toxicities were consistent with that described in the initial report [47, 48]. Based on these promising findings, a phase III multinational, placebo-controlled, first-line maintenance study of lenalidomide in patients with MCL is planned (NCT01021423).

Discussion

Effective therapies for patients with lymphoma are urgently needed. Targeted therapy based on signal transduction pathway alterations detected in lymphomas offers the hope of reaching this goal. Monotherapy with the proteasome inhibitor, bortezomib, has shown efficacy in MCL, and combination therapy with conventional chemotherapy regimens also appears promising. Bortezomib does not appear to have appreciable anti-tumor activity in patients with DLBCL or HL. Demonstration of durable complete and partial responses to monotherapy with the mTOR inhibitors (everolimus, temsirolimus, and ridaforolimus) in phase I/II monotherapy trials support further study of this class of compounds in phase III trials.

Treatment with bortezomib or the mTOR inhibitors is relatively well-tolerated, especially in these cohorts of heavily pretreated patients. The most common dose-limiting toxicities associated with bortezomib (1.3 or 1.5 mg/m2 twice weekly) were peripheral neuropathy, fatigue, and neutropenia. Similarly, the adverse events associated with the mTOR inhibitors were generally manageable; thrombocytopenia, neutropenia, and anemia were the most commonly reported hematologic toxicities. Starting doses of 10 mg/day for everolimus (with reductions to 5 mg/day if needed) and temsirolimus (175 mg/week for 3 weeks then 75 mg/week) are supported by the clinical trial data. Hypercholesterolemia or hypertriglyceridemia have been reported with the mTOR inhibitors [40, 44, 45], and one group of investigators recommends treating this adverse event with statins in patients continuing on long-term temsirolimus treatment [41].

Pulmonary toxicity associated with the mTOR inhibitors is an issue that needs to be carefully monitored and better understood. Dyspnea, cough, and pulmonary infiltrates have been observed in patients treated with everolimus and temsirolimus [38, 42, 44, 45]. However, these symptoms may also be associated with infection or the tumor itself, both of which should be ruled out before attributing causality to the mTOR inhibitor. In our study of everolimus in patients with HL, we did not consider asymptomatic pulmonary infiltrates to be dose limiting; rather we reduced the dose of everolimus only when patients became symptomatic (eg, dyspnea on exertion or cough) [45].

The demonstrated activity of bortezomib in MCL, and the mTOR inhibitors everolimus and temsirolimus in DLBCL and MCL, suggests that these agents may one day have a place in the treatment armamentarium for aggressive lymphomas. Results of monotherapy trials are encouraging, and the use of bortezomib, everolimus, and temsirolimus in combination with chemotherapy regimens currently is being studied with the goal of maximizing the response and overall survival in patients with aggressive lymphomas.

Abbreviations

DLBCL:

diffuse large B-cell lymphoma

GVHD:

graft-versus-host disease

HDACIs:

histone deacetylase inhibitors

HL:

Hodgkin lymphoma

MCL:

mantle cell lymphoma

mTOR:

mammalian target of rapamycin

NF-κB:

nuclear factor-κB

NHL:

non-Hodgkin lymphoma

PDGF:

platelet-derived growth factor

PI3K:

phosphoinositide 3-kinase

WM:

Waldenström macroglobulinemia

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Acknowledgements

The authors thank Scientific Connexions for literature searching, medical writing, and editing services funded by Novartis Pharmaceuticals.

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Authors and Affiliations

  1. Mayo Clinic, Rochester, MN, USA

    Patrick B Johnston & Thomas E Witzig

  2. Novartis Pharmaceuticals, Florham Park, NJ, and New Jersey Medical School (UMDNJ), Newark, NJ, USA

    RuiRong Yuan

  3. Oncology Institute of Southern Switzerland (IOSI), Bellinzona, Switzerland

    Franco Cavalli

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  1. Patrick B Johnston
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  4. Thomas E Witzig
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Correspondence to RuiRong Yuan.

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Competing interests

TW has received research support from Novartis and Celgene for clinical trials. PBJ has served on an advisory board for Novartis (no personal compensation). RY is an employee of and has equity interest in Novartis. FC has served on advisory boards for Novartis.

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TW, PBJ, RY, and FC contributed to the conception of this manuscript and were involved in drafting and/or revising the manuscript. All authors have read and approved the final manuscript and have given final approval of the version to be published.

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Johnston, P.B., Yuan, R., Cavalli, F. et al. Targeted therapy in lymphoma. J Hematol Oncol 3, 45 (2010). https://doi.org/10.1186/1756-8722-3-45

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Journal of Hematology & Oncology

ISSN: 1756-8722

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