The only other strong associations between genes and PD-L1-high status that were observed in these five tumour types were for ARID1A (OR 2.06, p = 9.43E–15) and MSH6 (OR 2.81, p = 1.86E–11) in CRC and MSH2 in PC (OR 3.24, p = 1.16E–4). This evidence concerns the gene MSH6 and neoplasm.