PTK2 and breast cancer: Likewise, in chromosome 8, arm-level gains of 8q and losses of 8p in human breast cancer SCNAs were further segmented into three amplification peaks involving STK3, MYC, and PTK2 and three deletion peaks involving CSMD1, PSD3, and IDO1 in hg19-aligned CMT SCNAs, respectively (Fig. 4d).