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Breast cancer, metastatic

5228 - Adaptive phase II randomized non-comparative trial of nivolumab after induction treatment in triple negative breast cancer: TONIC-trial

Date

09 Sep 2017

Session

Breast cancer, metastatic

Topics

Immunotherapy;  Breast Cancer

Presenters

Marleen Kok

Citation

Annals of Oncology (2017) 28 (suppl_5): v605-v649. 10.1093/annonc/mdx440

Authors

M. Kok1, H.M. Horlings2, K. van de Vijver2, T. Wiersma3, N. Russell3, L. Voorwerk4, K. Sikorska5, E. van Werkhoven5, I.A. Mandjes6, I. Kemper6, J. Foekema6, S. Wilgenhof6, M. Chalabi6, J. Stouthard6, G.S. Sonke7, D. Cullen8, R. Salgado9, T.N.M. Schumacher4, C.U. Blank1, S.C. Linn7

Author affiliations

  • 1 Medical Oncology & Immunology, Het Nederlands Kanker Instituut Antoni van Leeuwenhoek (NKI-AVL), 1006 BE - Amsterdam/NL
  • 2 Pathology, Het Nederlands Kanker Instituut Antoni van Leeuwenhoek (NKI-AVL), 1006 BE - Amsterdam/NL
  • 3 Radiotherapy, Het Nederlands Kanker Instituut Antoni van Leeuwenhoek (NKI-AVL), 1006 BE - Amsterdam/NL
  • 4 Immunology, Het Nederlands Kanker Instituut Antoni van Leeuwenhoek (NKI-AVL), 1006 BE - Amsterdam/NL
  • 5 Biostatistics, Het Nederlands Kanker Instituut Antoni van Leeuwenhoek (NKI-AVL), 1006 BE - Amsterdam/NL
  • 6 Medical Oncology, Het Nederlands Kanker Instituut Antoni van Leeuwenhoek (NKI-AVL), 1006 BE - Amsterdam/NL
  • 7 Medical Oncology, The Netherlands Cancer Institute, 1066CX - Amsterdam/NL
  • 8 Immuno-oncology, Bristol-Myers Squibb, 08540 - Princeton/US
  • 9 Pathology, Institute Jules Bordet, 1000 - Brussels/BE
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Abstract 5228

Background

Anti-PD(L)1 can result in durable responses in patients with metastatic triple negative breast cancer (TNBC). However, only a small subgroup of TNBC patients benefit from anti-PD(L)1 with response rates of ± 10% in unselected cohorts. As such, there is an urgent clinical need to identify strategies that render the tumor micro-environment more sensitive to anti-PD(L)1. Preclinical studies have shown that irradiation or low dose chemotherapy may stimulate anti-cancer immune responses. Here we present the first results of a phase II randomized trial of nivolumab after short induction with irradiation or low dose chemotherapy in metastatic TNBC.

Methods

Fifty patients with metastatic TNBC who received ≤ 3 lines of palliative chemotherapy were randomly allocated to one of five 2-week induction treatments consisting of 1) 3x8 Gy irradiation of one metastatic lesion or 2) 2x doxorubicin 15mg weekly or 3) cyclophosphamide 50mg daily orally or 4) 2x cisplatin 40mg/m2, weekly or 5) no induction treatment. After this 2-week induction period, all patients received nivolumab 3mg/kg until RECIST 1.1 progression. After 5x10 evaluable patients with paired biopsies (stage I), arms will be closed according to a ‘pick the winner’ concept (Simon’s two-stage design).

Results

To date, 50 patients are evaluable according to RECIST 1.1 with a median follow-up of 4 months (range 1-15). Previous treatments for metastatic disease were 0, 1 or 2+ lines in 20%, 52% and 28%, respectively. The ORR is 22% with 2 CRs (4%) and 9 PRs (18%). Additional two patients had a SD (4%), resulting in a clinical benefit rate (CR+PR+SD>24weeks) of 26%. The median duration of response was 10.9 months (95% CI 7.1-NA). Changes in tumor-infiltrating lymphocytes (TIL) after irradiation or low dose chemotherapy as well as response rates per treatment arm will be presented at the meeting.

Conclusions

This first study in TNBC shows that nivolumab after priming the tumor micro-environment with either irradiation or chemotherapy is feasible and results in a promising response rate that appear higher than expected based on previous PD-1/PD-L1 blockade monotherapy studies in unselected TNBC.

Clinical trial identification

Eudract number: 2015-001969-49

Legal entity responsible for the study

Netherlands Cancer Institute

Funding

Dutch Cancer Society, Pink Ribbon, BMS

Disclosure

D. Cullen: D. Cullen is an employee of BMS. R. Salgado: travel support Roche. T.N.M. Schumacher: Stocks Kite pharma, NEON, AIMM therapeutics Employee Kite pharma C.U. Blank: prof Blank is member of the advisory board of BMS. S.C. Linn: Advisory role: Novartis, Cergentis, Philips, AstraZeneca, Roche, Genentech, IBM. All other authors have declared no conflicts of interest.

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