PDCD1 and Hodgkins lymphoma: Within the last 5 years, PD-1 and PD-L1 inhibitors have been approved for use in melanoma, non-small-cell cancer, head, and neck squamous cell carcinoma, Hodgkin's lymphoma, urothelial carcinoma, renal cell carcinoma, as well as gastric and gastroesophageal carcinoma [reviewed in (59) and Table 1].