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Immune Checkpoint Inhibitors as Switch or Continuation Maintenance Therapy in Solid Tumors: Rationale and Current State

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Abstract

First-line chemotherapy for many solid tumors is limited by toxicity. There is a growing interest in maintenance therapy as a strategy for prolonging the benefits of first-line therapy while minimizing toxicity. Maintenance therapy can comprise either continuation of an agent given as part of the first-line regimen (continuation maintenance) or treatment with a new agent (switch maintenance). Maintenance therapy is already established in several solid tumors, including lung, breast, gastric, colorectal, and ovarian cancer. Immune checkpoint inhibitor treatment has been shown to prolong duration of response and overall survival, but efficacy is generally restricted to a limited proportion of patients with selected tumors. Thus, efforts are ongoing to determine whether the clinical benefits of immune checkpoint inhibitors can be extended using novel treatment schedules and settings, including maintenance therapy. Early- and late-phase clinical trials have investigated the efficacy and safety of immune checkpoint inhibitors as switch and continuation maintenance in different tumors, and a range of phase III trials are ongoing. Interpretation of results requires consideration of trial designs, eligibility criteria, and primary endpoints, in addition to biomarker exploration, and assessment of quality of life and cost effectiveness. Findings from ongoing trials will help further define the role of immune checkpoint inhibitors as maintenance therapy across a spectrum of solid tumors.

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Correspondence to Petros Grivas.

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Medical writing support for this review was provided by ClinicalThinking and funded by Merck KGaA and Pfizer, Inc.

Conflict of interest

Petros Grivas reports a consulting/advisory role for AstraZeneca, Bayer, Biocept, Bristol-Myers Squibb, Clovis Oncology, Dendreon, Driver Inc., EMD Serono, Exelixis, Foundation Medicine, Genentech, Genzyme, Heron Therapeutics, Janssen, Merck & Co., Mirati Therapeutics, Pfizer, QED Therapeutics, and Seattle Genetics; a speaker’s role (educational, unbranded program) for Bristol-Myers Squibb and Genentech; travel support from AstraZeneca and Clovis Oncology; and institutional research funding (for clinical trials) from AstraZeneca, Bavarian Nordic, Bayer, Bristol-Myers Squibb, Clovis Oncology, Debiopharm, Genentech, Immunomedics, Merck & Co., Mirati Therapeutics, Oncogenex, and Pfizer. Bradley Monk reports a consulting/advisory role for Advaxis, Aravive, Geistlich, Genmab, ImmunoGen, Mateon, Merck, Myriad, Perthera, Pfizer, Takeda, and VBL Therapeutics; and a speaker’s role for AstraZeneca, Clovis, Janssen/Johnson & Johnson, Roche/Genentech, and TESARO Incorporated. Daniel Petrylak reports a consulting/advisory role for Bayer, Bellicum, Dendreon, Sanofi, Johnson & Johnson, Exelixis, Ferring, Millennium, Medivation, Pfizer, Roche, and Tyme Pharmaceuticals; research funding from Agenysis, Celgene, Dendreon, Eli Lilly, Johnson & Johnson, Millineum, Oncogenix, Progenics, Roche, and Sanofi; and expert testimony for Sanofi. Martin Reck reports a consulting/advisory role for AstraZeneca, Boehringer Ingelheim, Bristol-Myers Squibb, Celgene, Eli Lilly, Merck, Merck Sharpe & Dohme, Novartis, Pfizer, and Roche; and a speaker’s role for AstraZeneca, Boehringer Ingelheim, Bristol-Myers Squibb, Celgene, Eli Lilly, Merck, Merck Sharpe & Dohme, Novartis, Pfizer, and Roche. Grace Foley and Constantin Makris are employed by Pfizer Inc. Silke Guenther is employed by Merck KGaA. Dan Hennessy is employed by EMD Serono (a business of Merck KGaA). Markus Moehler reports a consulting/advisory role for Amgen, Bayer, Bristol-Myers Squibb, Eli Lilly, Merck, Merck Sharpe & Dohme, Onyx, Pfizer, and Roche; research funding from AIO-Studien-gGmbH, Amgen, Bristol-Myers Squibb, European Organisation for Research and Treatment of Cancer, Merck, Merck Sharp & Dohme, Roche, Taiho Pharmaceutical, and Transgene; and honoraria from American Society of Clinical Oncology, Amgen, Bristol-Myers Squibb, Eli Lilly, European Society for Medical Oncology, Falk, Merck, Nordic, and Pfizer.

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Grivas, P., Monk, B.J., Petrylak, D. et al. Immune Checkpoint Inhibitors as Switch or Continuation Maintenance Therapy in Solid Tumors: Rationale and Current State. Targ Oncol 14, 505–525 (2019). https://doi.org/10.1007/s11523-019-00665-1

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