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Table 2 Published clinical trials of HER2 + breast cancer patients treated with immunotherapy, early setting

From: Immunotherapy in HER2-positive breast cancer: state of the art and future perspectives

Name

Drug

Phase

Setting

Number of HER2-positive patients

Type of intervention

Mechanism of action

Outcomes

Benavides et al. [168]

NA

I

Adjuvant

151*

Vaccine

Peptide-based vaccine (E75)

-Immune response (p = 0.02)

-DFS (p = 0.4 LE; p = 0.7 OE)

-Mortality (p = 0.08 LE; p = 0.6 OE)

Carmicheal et al. [169]

NA

I

Adjuvant

18

Vaccine

Peptide-based vaccine (GP2)

-Safety

-Immune response (p = 0.000004)

Holmes et al. [170]

NA

I

Adjuvant

15

Vaccine

Peptide-based vaccine (AE37)

Immunological response

Limentani et al. [171]

NA

I

Adjuvant

61

Vaccine

Recombinant HER2 protein + immunostimulant

Immunological response

Peoples et al. [172]

NA

NA

Adjuvant

53

Vaccine

Peptide-based vaccine (E75)

DFS (p < 0.19)

Mittendorf et al. [173]

Nelipepimut-S

I/II

Adjuvant

187

Vaccine

Peptide-based vaccine (E75)

DFS (p = 0.08)

Patil et al. [174]

NA

I/II

Adjuvant

52 (28% of all patients)

Vaccine

Peptide-based vaccine (E75)

-Immunological response

-DFS (0.52)

Peoples et al. [175]; Mittendorf et al. [176]

NA

NA

Adjuvant

186

Vaccine

Peptide-based vaccine (E75)

-Immunological response

-DFS (p = 0.04 20 months; p = 0.08 24 months)

Mittendorf et al. [177]

NA

II

Adjuvant

101

Vaccine

Peptide-based vaccine (GP2)

DFS (p = 0.43)

Clifton et al. [178]

NA

I

Adjuvant

17

Vaccine

Peptide-based vaccine (GP2)

Immunological response

Mittendorf et al. [179]

NA

II

Adjuvant

144

Vaccine

Peptide-based vaccine (AE37)

-DFS (p = 0.45)

-Immunological response

Higgins et al. [180]

NA

I

Neoadjuvant

15 (25% of total patients)

Vaccine

Wilms’ tumor 1 (WM1) immunotherapeutic

-Objective response rate

-Immunogenicity

Valdes-Zayas et al. [181]

NA

III

Adjuvant

22 (25% of total evaluated patients)

Vaccine

Anti-ganglyoside vaccine (NeuGcGM3)

Immunological response

Czerniecki et al. [182]

NA

I

Neoadjuvant

13

Vaccine

Dendritic cell based vaccine

Immunological response

Koski et al. [183]

NA

I

Neoadjuvant

27

Vaccine

Dendritic cell-based vaccine

-Immunological response

Lowenfeld et al. [184]

NA

I

Neoadjuvant

54

Vaccine

Dendritic cell-based vaccine

-Immunological response

-pCR

  1. *Patients were stratified by HER2 expression and divided into low expressors and overexpressors. Low expressors were defined as HER2/neu immunohistochemistry (IHC) 1(+) to 2(+) or fluorescence in situ hybridization < 2.0. Overexpressors were defined as IHC 3(+) or fluorescence in situ hybridization > or = 2.0 +
  2. Abbreviations: ADCC antibody-dependent cytotoxic cell, DFS disease-free survival, LE low expressors, NK natural killer, NA not available, OE overexpressors, OS overall survival, pCR pathological complete response