1. PD-L1 blockade in combination with carboplatin as immune induction in metastatic lobular breast cancer
- Author
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Leonie Voorwerk, Olga I. Isaeva, Hugo M. Horlings, Sara Balduzzi, Maksim Chelushkin, Noor A. M. Bakker, Elisa Champanhet, Hannah Garner, Karolina Sikorska, Claudette E. Loo, Inge Kemper, Ingrid A. M. Mandjes, Michiel de Maaker, Jasper J. L. van Geel, Jorianne Boers, Maaike de Boer, Roberto Salgado, Marloes G. J. van Dongen, Gabe S. Sonke, Karin E. de Visser, Ton N. Schumacher, Christian U. Blank, Lodewyk F. A. Wessels, Agnes Jager, Vivianne C. G. Tjan-Heijnen, Carolien P. Schröder, Sabine C. Linn, Marleen Kok, Guided Treatment in Optimal Selected Cancer Patients (GUTS), Epidemiology, and Medical Oncology
- Subjects
EXPRESSION ,Cancer Research ,LOCALLY RECURRENT ,Oncology ,SDG 3 - Good Health and Well-being ,CARCINOMA ,FEATURES ,MULTICENTER ,SURVIVAL ,CRITERIA ,IMMUNOTHERAPY ,CHEMOTHERAPY ,SIGNATURES - Abstract
Invasive lobular breast cancer (ILC) is the second most common histological breast cancer subtype, but ILC-specific trials are lacking. Translational research revealed an immune-related ILC subset, and in mouse ILC models, synergy between immune checkpoint blockade and platinum was observed. In the phase II GELATO trial (NCT03147040), patients with metastatic ILC were treated with weekly carboplatin (area under the curve 1.5 mg ml–1 min–1) as immune induction for 12 weeks and atezolizumab (PD-L1 blockade; triweekly) from the third week until progression. Four of 23 evaluable patients had a partial response (17%), and 2 had stable disease, resulting in a clinical benefit rate of 26%. From these six patients, four had triple-negative ILC (TN-ILC). We observed higher CD8+ T cell infiltration, immune checkpoint expression and exhausted T cells after treatment. With this GELATO trial, we show that ILC-specific clinical trials are feasible and demonstrate promising antitumor activity of atezolizumab with carboplatin, particularly for TN-ILC, and provide insights for the design of highly needed ILC-specific trials.
- Published
- 2023
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