HN1 (hematopoietic- and neurologic-expressed sequence 1) is a highly conserved protein that is expressed in developing and regenerating tissues. Overexpression of HN1 has been reported in various tumors like glioma and breast cancer. Hn1 has also been reported as a marker for human ovarian carcinoma and can distinguish epithelial ovarian carcinoma cells from normal ovarian surface epithelial cells. This collective information suggests that HN1 is involved in processes associated with cell proliferation, repair and/or growth.