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Vol. 89. Issue 3.
Pages 152-158 (March 2011)
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Vol. 89. Issue 3.
Pages 152-158 (March 2011)
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Is Body Mass Index a prognostic factor of survival in colonic cancer? A multivariate analysis
¿Es el índice de masa corporal un factor pronóstico de supervivencia en el cáncer de colon? Análisis multivariable
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Miguel Juan Garcia-Oria Serranoa,*, Manel Armengol Carrascob, Aránzazu Caballero Millánc, Christine D. Chingd, Antoni Codina Cazadore
a Servicio de Cirugía General y Digestiva, Hospital Universitario de Getafe, Madrid, Spain
b Cátedra de Cirugía, Universitat Autònoma de Barcelona, Servicio de Cirugía General y Digestiva, Hospital Universitari Vall d’Hebron, Barcelona, Spain
c Servicio de Urgencias, Hospital Clínico Universitario Lozano Blesa, Zaragoza, Spain
d Surgical Oncology, Palo Alto Medical Foundation, California, United States
e Servicio de Cirugía General y Digestiva, Hospital Universitari de Girona Dr. Josep Trueta, Girona, Spain
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Abstract
Introduction

The long-term survival of patients operated on for colonic cancer depends on many factors. Obesity decreases the life expectancy of the general population who suffer from it, but it is not clear whether obesity, measured by the Body Mass Index (BMI), is a prognostic factor of survival for patients operated on for colonic cancer.

Material and methods

The patients included in this study had TNM stage I, II y III, and were subjected to elective surgery for cancer of the colon in the Girona University Hospital between 1990 and 2001. The BMI was classified according to the WHO classification. A total of 38 different variables were studied using a bivariate analysis with BMI. A Cox model was subsequently constructed with the most clinically relevant parameters, and with those most strongly associated with survival in the bivariate analysis.

Results

BMI was not associated with survival in the bivariate analysis. Neither did the multivariate analysis show that BMI was an independent prognostic factor of long-term survival in cancer of the colon without metastasis, but it did show that the TNM stage, ASA score, surgical technique, age at surgery, and the immune cell response were prognostic factors.

Conclusions

The body mass index is not a prognostic factor of the long-term survival of patients with colonic cancer.

Keywords:
Colorectal neoplasia
Obesity
Body mass index
Prognostic factors
Survival
Resumen
Introducción

La supervivencia a largo plazo de los pacientes intervenidos por cáncer de colon depende de múltiples factores. La obesidad disminuye la expectativa de vida de la población general que la padece, pero no está claro si la obesidad, medida con el índice de masa corporal (IMC), es un factor pronóstico de supervivencia para los pacientes intervenidos por cáncer de colon.

Material y métodos

Hemos incluido en este estudio a pacientes en estadios TNM I, II y III, sometidos a cirugía electiva por cáncer de colon en el Hospital Universitari de Girona entre 1990 y 2001. El IMC se ha categorizado siguiendo la clasificación de la OMS. Hemos estudiado 38 parámetros distintos realizando un estudio bivariable con el IMC. El modelo de Cox ha sido construido posteriormente con los parámetros más clínicamente relevantes y con los más fuertemente asociados con la supervivencia en el estudio bivariable.

Resultados

El IMC no se asoció con la supervivencia en el análisis bivariable. El análisis multivariable tampoco mostró que el IMC sea un factor pronóstico independiente de supervivencia a largo plazo en el cáncer de colon sin metástasis, pero sí lo fueron el estadio TNM, la puntuación ASA, la técnica quirúrgica, la edad a la cirugía y la respuesta inmunitaria celular.

Conclusiones

El IMC no es un factor pronóstico de supervivencia a largo plazo en pacientes con cáncer de colon.

Palabras clave:
Neoplasia colorrectal
Obesidad
Índice de masa corporal
Factores pronósticos
Supervivencia
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This study is prepared with data from the first author's doctoral thesis, read on 11 June 2009 and carried out in the Universitat Autònoma de Barcelona (Autonomous University of Barcelona).

Copyright © 2011. Asociación Española de Cirujanos
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