title: Age distribution of breast cancer from a Thailand population- based cancer registry.
abstract: BACKGROUND
  Breast cancer is a common cancer worldwide. With the establishment of Thailand's population- based cancer registry and availability of complete data from 2002-2011, it is of interest to investigate the epidemiologic and clinic-pathological profiles of breast cancer based on the population-based registry data.
  
  
  METHODS
  The data of all breast cancer patients in the registry for the period of 2002-2011 were included. All medical records of the patients diagnosed from documents of National Cancer Registry of Thailand were retrieved and the following information abstracted: age, clinical characteristics, and histological variables. Thailand census data for the period of 2002-2011 were used to provide the general population's statistics on age, gender, and other related demographic factors.
  
  
  RESULTS
  Over the 10 year-period, 7,711 breast cancer cases were included. The disease incidence under age 40 years was relatively low (4.13/105) while the incidence in the age groups 40 and older was very high (39.2/105). The vast majority of breast cancer cases (88.8%) were diagnosed by histology as primary lesions in the breast. The most common of patients with breast cancer (36.4%) had regional lymph node involvement and the most common of histopathology diagnosed in patients (84.2%) was an infiltrating duct carcinoma.
  
  
  CONCLUSIONS
  This study showed a high incidence of breast cancer in older subjects, and high rate of breast cancer in Thailand. Future studies should explore clinical and molecular disease patterns.
authors.affiliation: Medical Technology Program, School of Allied Health Sciences and Public Health, Walailak University, Nakhon Si Thammarat, Thailand. manas.ko@wu.ac.th
authors.forename: Manas
authors.initials: M
authors.lastname: Kotepui
authors.forename: Chaowanee
authors.initials: C
authors.lastname: Chupeerach
mesh_terms: D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D000368:Aged; D001943:Breast Neoplasms / Q000453:epidemiology* / Q000473:pathology; D002648:Child; D002675:Child, Preschool; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D015994:Incidence; D007223:Infant; D007231:Infant, Newborn; D008875:Middle Aged; D009367:Neoplasm Staging; D011379:Prognosis; D012042:Registries / Q000706:statistics & numerical data*; D013785:Thailand / Q000453:epidemiology; D055815:Young Adult