Radiation Oncology Journal

The Korean Society for Radiation Oncology (대한방사선종양학회)
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Association between obesity and local control of advanced rectal cancer after combined surgery and radiotherapy

  • Choi, Yunseon (Department of Radiation Oncology, Inje University Busan Paik Hospital, Inje University College of Medicine) ;
  • Lee, Yun-Han (Department of Molecular Medicine, Keimyung University School of Medicine) ;
  • Park, Sung Kwang (Department of Radiation Oncology, Inje University Busan Paik Hospital, Inje University College of Medicine) ;
  • Cho, Heunglae (Department of Radiation Oncology, Inje University Busan Paik Hospital, Inje University College of Medicine) ;
  • Ahn, Ki Jung (Department of Radiation Oncology, Inje University Busan Paik Hospital, Inje University College of Medicine)
  • Received : 2016.03.22
  • Accepted : 2016.05.19
  • Published : 2016.06.30
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Abstract

Purpose: The association between metabolism and cancer has been recently emphasized. This study aimed to find the prognostic significance of obesity in advanced stage rectal cancer patients treated with surgery and radiotherapy (RT). Materials and Methods: We retrospectively reviewed the medical records of 111 patients who were treated with combined surgery and RT for clinical stage 2-3 (T3 or N+) rectal cancer between 2008 and 2014. The prognostic significance of obesity (body mass index [BMI] ${\geq}25kg/m^2$) in local control was evaluated. Results: The median follow-up was 31.2 months (range, 4.1 to 85.7 months). Twenty-five patients (22.5%) were classified as obese. Treatment failure occurred in 33 patients (29.7%), including local failures in 13 patients (11.7%), regional lymph node failures in 5, and distant metastases in 24. The 3-year local control, recurrence-free survival, and overall survival rates were 88.7%, 73.6%, and 87.7%, respectively. Obesity (n = 25) significantly reduced the local control rate (p = 0.045; 3-year local control, 76.2%), especially in women (n = 37, p = 0.021). Segregation of local control was best achieved by BMI of $25.6kg/m^2$ as a cutoff value. Conclusion: Obese rectal cancer patients showed poor local control after combined surgery and RT. More effective local treatment strategies for obese patients are warranted.

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