Current opinions in immune checkpoint inhibitors rechallenge in solid cancers

Immune checkpoint inhibitors (ICI) completely upset the therapeutic algorithm of several type of solid cancer conferring in some patients a long clinical benefit with an acceptable toxicity. ICI rechallenge is an attractive option being a palliative chemotherapy the only alternative treatment in most of cases. Despite this strategy recently entered into the clinical practice, no widely recognized recommendation is currently available to select the good candidates. Anti-Cytotoxic T Lymphocyte Antigen 4 (Anti-CTLA4) rechallenge and a sequential administration of anti-CTLA4 and anti-Programmed cell Death protein 1 (anti-PD1) or Anti-Programmed Death Ligand 1 (anti-PDL1) agents have been explored in melanoma patients in several clinical trials while the anti-PD1/anti-PDL1 rechallenge has been little investigated. Here we performed a literature revision about efficacy and tolerability of ICI rechallenge across solid tumors also focusing on inclusion criteria used into clinical trials.