SFRP2 and pachyonychia congenita: Comparison of PC and SRC carcinomas with combined PC/SRC carcinoma showed that PTPRM, MMP3, AREG, SFRP2, and ITGB1BP1 were upregulated in PC carcinoma, whereas AREG, PROK2, ID1, CRDBBP, and IL1RL1 were upregulated in SRC carcinoma.