Nivolumab-induced adrenalitis.

Immune checkpoint inhibitors (ICIs) are an evolving class of drugs for the treatment of various cancers; for example, their use is recommended as a second-line chemotherapy for non-small cell lung cancer. With the expanding use of ICIs, we are discovering their unique side effects, called immune-related adverse events (irAEs), which can impair gastrointestinal, hepatic, dermatological, endocrine and other systems. Nivolumab is an ICI that blocks the human programmed death receptor-1 (PD-1) on T cells to prevent the interaction between the receptor, PD-1, and human programmed death ligand-1 expressed on tumour cells. Here, we report a case of a 65-year-old woman with recurrent lung adenocarcinoma who was treated with nivolumab and developed immune-related adrenalitis, which was managed with hydrocortisone and fludrocortisone. This case highlights the importance of understanding the irAEs of ICIs to allow prompt recognition and management of life-threatening complications of the treatment.