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Joint prognostic effect of obesity and chronic systemic inflammation in patients with metastatic colorectal cancer
Author(s) -
Shah Manasi S.,
Fogelman David R.,
Raghav Kanwal Pratap Singh,
Heymach John V.,
Tran Hai T.,
Jiang ZhiQin,
Kopetz Scott,
Daniel Carrie R.
Publication year - 2015
Publication title -
cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.052
H-Index - 304
eISSN - 1097-0142
pISSN - 0008-543X
DOI - 10.1002/cncr.29440
Subject(s) - medicine , hazard ratio , colorectal cancer , proportional hazards model , body mass index , oncology , confidence interval , cancer , gastroenterology
BACKGROUND Obesity is strongly linked with chronic systemic inflammation, and each has been linked with disease progression and survival in patients with colorectal cancer (CRC). The authors investigated the joint prognostic effects of obesity and circulating cytokines in patients with metastatic CRC (mCRC), an understudied patient group. METHODS In 242 chemotherapy‐naive patients with mCRC, the authors measured a multiplex cytokine panel and abstracted clinicopathological features, height, and weight from medical records. Overall survival (OS) was calculated from the date of mCRC diagnosis until the date of death from any cause and evaluated by Kaplan‐Meier analysis and multivariable Cox proportional hazards regression models. Cut points for cytokines were determined by restricted cubic spline regression. RESULTS In multivariable models, elevated interleukin (IL)−8, IL‐2 receptor alpha, and lactate dehydrogenase (LDH) emerged as significant predictors of poor OS (hazard ratio [HR] and 95% confidence interval [95% CI] for above vs below the (referent) knot point: 2.5 [95% CI, 1.7‐3.7], 1.9 [95% CI, 1.3‐2.7], and 2.2 [95% CI, 1.6‐3.1], respectively; all P <.001). Obesity (body mass index ≥30 kg/m 2 ) was not found to be associated with OS, but appeared to modify the relationships observed with IL‐8 and LDH, which were associated with a significant 4‐fold and 5‐fold risk of death, respectively, in obese patients compared with a 2‐fold risk of death in nonobese patients ( P for interaction of .06 and .04, respectively). Similar results emerged from joint effects analysis, in which obese patients with high IL‐8 (or LDH) experienced the highest risk of death. CONCLUSIONS Although obesity itself was not found to be independently associated with survival in patients with mCRC, the adverse prognostic significance of LDH and IL‐8 was found to be enhanced in obese patients. Cancer 2015;121:2968–2975. © 2015 American Cancer Society .

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