The primary tumor location was an independent prognostic marker in patients with RAS wild - type metastatic colorectal cancer after adjusting for age, gender, synchronous / metachronous disease, consensus molecular subtype, and
microsatellite instability and molecular
status, according to the results of an analysis (abstract 3503) of data from CALGB / SWOG 80405 presented at the 2017 American Society of Clinical Oncology (ASCO) Annual Meeting.