PTK7 and breast cancer: While no significant association was found between PTK7 expression and OS, RFS, or DMFS in BC patients, or between PTK7 expression and OS or DMFS in TNBC patients, hazard ratios above 1.00 for RFS and DMFS in BC patients, as well as for OS and DMFS in TNBC patients suggest a potential negative effect of high PTK7 expression on survival.