L1TD1 and breast carcinoma: In contrast, L1TD1 expression was significantly downregulated in breast carcinomas (p = 0.0253), colorectal carcinomas (p = 0.0224) and in prostate carcinomas (p < 0.0001), but not in head and neck carcinomas, kidney clear cell carcinomas and in hepatocellular carcinomas (Additional file 2: Figure S1).