FAP and testicular germ cell tumor: As displayed in Figure 1D, FAP expression showed a general uptrend from earlier stages to later stages in BLCA, COAD, ESCA, Kidney renal papillary cell carcinoma (KIRP), Ovarian serous cystadenocarcinoma (OV), STAD, Testicular Germ Cell Tumors (TGCT) and THCA, indicating a possible promotion role of FAP in the tumor progression of the above-mentioned cancers.