As shown in Fig. 4, the expression of KCTD12 in CESC, PAAD, STAD, testicular germ cell tumors (TGCT), THYM, and HNSC (HNSC-HPV−/HNSC-HPV+) TCGA tumors showed a statistically positive correlation with the degree of CAF infiltration. Here, KCTD12 is linked to testicular germ cell tumor.