To the Editor Liu and colleagues1 have downplayed the role of hereditary factors in their study of obesity in early-onset colorectal cancers (CRCs). Family history is not reliable in excluding hereditary CRCs; an editorial in JAMA on a study identifying Lynch Syndrome (LS) noted that the “study results should remind clinicians that simply asking about a family history of CRC in a first-degree relative will miss the majority of patients with LS: only 43% of patients with LS had such a family history.”2
Venniyoor A. Becoming a Statistic in the Middle of an Epidemic—A Call to Consider Alternate Risk Factors for Early-Onset Colorectal Cancer. JAMA Oncol. 2019;5(8):1228. doi:10.1001/jamaoncol.2019.1323
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