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Editorial
October 2017

Prognostic and Predictive Ability of Tumor SidednessAnother Vexing Difference Between Localized and Advanced Colon Cancer

Author Affiliations
  • 1Departments of Surgical Oncology and Health Services Research, The University of Texas, MD Anderson Cancer Center, Houston
  • 2Department of Epidemiology and Biostatistics, Memorial Sloan Kettering Cancer Center, New York, New York
JAMA Oncol. 2017;3(10):1314-1315. doi:10.1001/jamaoncol.2017.1905

There has been a flurry of recent interest in the effect of primary tumor sidedness on prognosis and treatment response among patients with colorectal cancer (CRC). This interest has largely been sparked by recent observations that among patients with metastatic CRC (mCRC), primary tumor sidedness was associated not only with prognosis but also, among those patients without KRAS mutations, with response to epidermal growth factor receptor (EGFR).1,2 Based on these findings, a number of investigators now advocate for the inclusion of tumor sidedness as an important stratification criteria in the design of future clinical trials. Naturally, these observations have led many investigators to question if tumor sidedness is also prognostic in patients with localized disease.

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