Sex-Specific Prognostic Significance of Obesity in Nonmetastatic Clear-Cell Renal-Cell Carcinoma in Korea: A Large Multicenter Cohort Analysis

Seok Soo Byun, Eu Chang Hwang, Seok Ho Kang, Sung Hoo Hong, Jinsoo Chung, Tae Gyun Kwon, Hyeon Hoe Kim, Cheol Kwak, Yong June Kim, Won Ki Lee

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Abstract

Introduction: We assessed the prognostic significance of obesity in relation to sex in patients with nonmetastatic clear-cell renal-cell carcinoma (nm-cRCC) in a large multicenter setting in Korea. Patients and Methods: A total of 2097 patients with nm-cRCC who underwent surgery with curative intent were enrolled from 6 institutions in Korea between April 2000 and February 2014. Obesity was determined by body mass index (BMI) before surgery. BMI was used as a continuous variable and was categorized as normal (≥ 18.5 to < 25.0 kg/m2, normal BMI) and overweight or obese (≥ 25 kg/m2, high BMI). The relationships between BMI, sex, recurrence-free survival (RFS), and cancer-specific survival (CSS) were evaluated. Results: Male patients had a greater high BMI ratio than female patients (P = .030). In men, the 5-year RFS and CSS rates in the high BMI group were greater than those in the normal BMI group (P = .003 and .006, respectively). Multivariate analyses revealed that in men, a high BMI was associated with greater RFS or CSS rates (hazard ratio: RFS, 0.901, P = .001; CSS, 0.822, P < .001). In women, there were no significant differences in the 5-year RFS and CSS rates according to BMI (P = .531 and .323, respectively), and high BMI was not associated with RFS or CSS (P = .250 and .180, respectively). Conclusion: In patients with nm-cRCC, obesity was a favorable prognosticator in male but not female patients. Therefore, the association between obesity and nm-cRCC prognosis might differ by sex.

Original languageEnglish
JournalClinical Genitourinary Cancer
DOIs
Publication statusAccepted/In press - 2017 Jan 1

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Keywords

  • Body mass index
  • Kidney cancer
  • Prognosis
  • Sex
  • Survival

ASJC Scopus subject areas

  • Oncology
  • Urology

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