Cautious about interpretation
Dr. Cheng and colleagues concluded their publication with a disclaimer: “Our finding of a survival advantage associated with early-onset CRC among younger individuals should be interpreted cautiously, given that the advantage had a small magnitude and was heterogeneous by age and stage,” they wrote. “Further study is needed to understand the underlying heterogeneity of survival by age and stage among individuals with early-onset CRC.”
Kirbi L. Yelorda, MD, of Stanford (Calif.) University, and colleagues, had a similar interpretation.
“These results offer support for effectiveness of treatment in patients diagnosed with CRC at younger ages; however, they must be interpreted within the context of epidemiological and biological factors,” Dr. Yelorda and colleagues wrote in an accompanying editorial.
The findings also suggest that the recent reduction in recommended screening age by the U.S. Preventive Services Task Force – from 50 years to 45 years – is warranted, they added, but screening younger patients remains unnecessary.
“While these results do not suggest that screening should start for patients younger than 45 years, they do support the benefit of early detection in young patients,” Dr. Yelorda and colleagues wrote, noting a “fairly low incidence rate” among individuals younger than 45, which is insufficient to justify the risk-to-benefit ratio and increased costs associated with expanded screening.
Important but not surprising
It’s “not surprising” that early-onset patients typically have better survival than later-onset patients, according to Joseph C. Anderson, MD, associate professor at White River Junction Veterans Affairs Medical Center, Hartford, Vt.; Geisel School of Medicine at Dartmouth, Hanover, N.H.; and the University of Connecticut, Farmington.
“They’re younger, have less comorbidities, and can tolerate chemotherapy,” Dr. Anderson said in an interview. “It’s not surprising that people do poorly with later stages. Younger people are no exception.”
Dr. Anderson, who previously coauthored an editorial weighing the pros and cons of earlier screening, noted that earlier screening is needed because of the rising incidence of late-stage diagnoses among younger patients, which, as the study found, are associated with worse outcomes.
Beyond adherence to screening recommendations, Dr. Anderson urged clinicians to be aggressive when doing a workup of CRC symptoms in younger patients, among whom delayed diagnoses are more common.
“We can’t just say it’s something more benign, like hemorrhoids, like we used to,” Dr. Anderson said. “Somebody who’s 30 years old and having rectal bleeding needs to be evaluated promptly – there can’t be a delay.”
The study was supported by the National Institutes of Health and Stand Up To Cancer (grant administered by the American Association for Cancer Research). The investigators disclosed relationships with Evergrande Group, Janssen, Revolution Medicines, and others. One editorialist reported serving as a member of the USPSTF when the guideline for colorectal cancer was developed, and being a coauthor on the guideline. No other disclosures were reported among editorialists. Dr. Anderson reported no relevant conflicts of interest.