title: [Variations in a 24-year period of colorectal and gastric cancer in Mexico].
abstract: OBJECTIVE
  Gastric cancer (CG) and colorectal cancer (CCR) are the two most common neoplasms of the digestive system in the world. We performed a study to determine incidence and relation between CG and CCR in five hospitals in Mexico City.
  
  
  METHODS
  Patients with admitted diagnosis of CG and CCR at Hospital General de Mexico, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Hospital Español de México, Centro Médico Nacional "20 de Noviembre" from the Instituto de Salud y Seguridad Social para Trabajadores del Estado, and Hospital Central Militar from January 1978 to December 2001 were studied.
  
  
  RESULTS
  A total of 7,136 patients were studied. (CG 3,830, CCR 3,306). At Instituto Nacional de Ciencias Médicas y Nutrición "Salvador Zubirán" CG was the most common digestive neoplasm; from 1999, ratio was inverted to < 1. At Hospital General de México, from the beginning and until 1984, ratio was > 2, and later had an average of 1.31. For Hospital Español, ratio always was < 1 without changes. At Centro Médico Nacional "20 de Noviembre", initially CCR was more frequent, then CG, and finally CCR. At Hospital Central Militar ratio was constant, > CG. At the beginning, was global behavior > CG, ratio seemed to invert, but since 1998 CG/CCR ratio was < 1 and continued that way.
  
  
  CONCLUSIONS
  In this study, we found that changes of CG/CCR ratio in a period of 24 years showed elevation of CCR incidence at five Mexican hospitals.
authors.affiliation: Departamento de Oncología, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Vasco de Quiroga 15, Del. Tlalpan, Tlalpan C.P. 14000, México, D.F.
authors.forename: José Luis
authors.initials: JL
authors.lastname: González Trujillo
authors.forename: Florencia
authors.initials: F
authors.lastname: Vargas
authors.forename: Gonzalo
authors.initials: G
authors.lastname: Torres Villalobos
authors.forename: Pilar
authors.initials: P
authors.lastname: Milke
authors.forename: José de Jesús
authors.initials: Jde J
authors.lastname: Villalobos Pérez
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015331:Cohort Studies; D015179:Colorectal Neoplasms / Q000453:epidemiology*; D004034:Diet Surveys; D005260:Female; D006801:Humans; D007297:Inpatients; D008297:Male; D008800:Mexico / Q000453:epidemiology; D008875:Middle Aged; D012307:Risk Factors; D013274:Stomach Neoplasms / Q000453:epidemiology*