CD274 and familial pancreatic carcinoma: In addition, studies relating PD-L1 expression to disease outcome have been done in most tumours, and the results show that PD-L1 expression strongly correlates with unfavourable prognosis in kidney [6], ovarian [7], bladder [8], breast [9], liver [10], gastric [11], and pancreatic cancer [12], but not in non-small cell lung cancer (NSCLC) [13].