“…The cancer site considered is colorectal cancer (CRC) in 10 studies [59,60,64,67,75,[77][78][79][80][81]; CRC or esophagogastric cancer in 1 study [82]; gastrointestinal cancer (GI) in 1 study [72]; GI, gastro-urinary (GU) or breast cancer in another study [73]; GI or lung cancer in another study [70]; GI or other sites in another study [74]; GU, bladder, kidney or NSCLC in another study [69]; head and neck, lung, upper GI or CRC in another study [71]; NSCLC in another study [66]; prostate, lung, haematologic, GI, head/neck, bladder, renal and other sites in another study [86]; lymphoma, leukaemia or multiple myeloma in another study [65]; solid cancers in 4 studies [61,63,83,85]; solid cancers or lymphoma in another 4 studies [58,62,68,84] and different malignant neoplasms in another study [76].…”