“…For the above reasons, efforts have been made to find response criteria specifically adapted for immunotherapy for both CT (irRC, irRECIST, iRECIST, imRECIST) [5] and PET/CT, namely PET Response Evaluation Criteria for Immunotherapy (PERCIMT) [6], PET/CT Criteria for early prediction of Response to Immune checkpoint inhibitor therapy (PECRIT) [7], Immunotherapy-modified PERCIST (imPERCIST) [8] and immune PET Response Criteria in Solid Tumors (iPERCIST) [9] (Table 1). These criteria were developed based on melanoma (PERCIMT, imPERCIST and PECRIT) and lung cancer (iPERCIST), the two solid tumors in which more experience has been reported on the clinical use of PET in immunotherapy.…”