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Dietary intake of branched‐chain amino acids and survival after colorectal cancer diagnosis
Author(s) -
Long Lu,
Yang Wanshui,
Liu Li,
Tobias Deirdre K.,
Katagiri Ryoko,
Wu Kana,
Jin Lina,
Zhang FangFang,
Luo Xiao,
Liu Xing,
Ogino Shuji,
Chan Andrew T.,
Meyerhardt Jeffrey A.,
Giovannucci Edward,
Zhang Xuehong
Publication year - 2020
Publication title -
international journal of cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.475
H-Index - 234
eISSN - 1097-0215
pISSN - 0020-7136
DOI - 10.1002/ijc.33449
Subject(s) - medicine , quartile , hazard ratio , valine , colorectal cancer , confounding , proportional hazards model , confidence interval , cancer , gastroenterology , endocrinology , amino acid , biology , biochemistry
Branched‐chain amino acids (BCAAs), including leucine, isoleucine and valine, may potentially influence cancer progression by various mechanisms including its role in insulin resistance. However, the association of BCAAs with survival among patients with established colorectal cancer (CRC) remains unclear. We evaluated the associations between postdiagnostic BCAA intake with CRC‐specific mortality and overall mortality among 1674 patients with nonmetastatic CRC in the Nurses' Health Study and the Health Professionals Follow‐up Study. Patients completed a validated food frequency questionnaire. Multivariable hazard ratios (HRs) were calculated using Cox proportional‐hazards regression model after adjustment for tumor characteristics and potential confounding factors. Comparing the highest with the lowest quartile intake of postdiagnostic total BCAA, the multivariable HRs were 1.18 (95% confidence interval [CI], 0.75‐1.85, P for trend = .46 across quartiles) for CRC‐specific mortality and 1.30 (95% CI, 1.01‐1.69, P for trend = .04) for all‐cause mortality. The multivariable HRs (the highest vs the lowest quartile) for all‐cause mortality were 1.33 (95% CI, 1.03‐1.73, P trend = .02) for valine, 1.28 (95% CI, 0.99‐1.66, P for trend = .05) for leucine and 1.25 (95% CI, 0.96‐1.61, P for trend = .06) for isoleucine. No statistically significant associations with each of the BCAA intake were observed for CRC‐specific mortality (all P for trend > .30). Our findings suggest positive associations between higher intake of dietary BCAAs and risk of all‐cause mortality in CRC patients. These findings need to be confirmed and potential mechanisms underlying this association need to be elucidated.