PTK6 expression was low or undetectable in normal ovary [2] or normal breast epithelium [3,4,6], but it was found in human ovarian tumor cells [2] and in greater than 60% of breast tumors and breast cancer derived cell lines [7], indicating that overexpression of PTK6 may be related to carcinogenesis. This evidence concerns the gene PTK6 and ovarian neoplasm.