Immune checkpoint inhibitor-mediated colitis in a patient with epidermoid metastatic lung cancer: new and emerging toxicities.

In recent years, the development of immunotherapy has been stablished with monoclonals antibodies against control immune molecules in T lymphocytes, tumor cells and other cells, which block lymphocyte activation and suppress immune response. These molecules are Cytotoxic T-Lymphocyte Antigen 4 (CTLA-4) and Programmed Death-ligand 1 (PD-1). Despite clinical benefits, these therapies are not exempt from side effects known as immune-related adverse events (irAEs). We report the case of a 68-year-old female with stage IIIB epidermoid lung cancer diagnosed in 2017.