A range of CSF1R inhibitors are currently under clinical trials [21] for the treatment of cancers including metastatic breast cancer (NCT01596751), ovarian cancer (NCT01525602), colorectal and pancreatic cancer (NCT02777710), solid tumors (NCT02452424) and, for rheumatoid arthritis (NCT01329991). This evidence concerns the gene CSF1R and cancer.