CD164 and neoplasm: Because generating tumors by subcutaneous injection allows for easy monitoring of tumor growth, and intra-peritoneal injection allows tumor cells to grow in a peritoneal microenvironment that mimics the microenvironment of ovarian cancer tumors, we developed two xenograft models in nude mice to evaluate the tumor formation ability of the hOSE-CD164 and SKOV3 cells (as a positive control).