title: Study of the association between blood types and breast cancer among Isfahanian women with breast cancer.
abstract: BACKGROUND
  Previous studies suggest a possible association between ABO blood group and the risk of breast cancer. The aim of this study is to investigate the presence of a possible association between breast cancer and blood groups ABO and Rh.
  
  
  METHODS
  549 women including 173 cases and 376 controls were selected. The case group included patients with breast cancer and the cancer diagnosis was confirmed for all of them. The control group included women with no reports of breast cancer. Blood group sampling of all cases was performed. The obtained information regarding presence or absence of cancer, blood type, age group and type of cancer were analyzed.
  
  
  RESULTS
  There is no significant association between blood types ABO (Rh) and the breast cancer. (P > 0.05) It has been found that the prevalence of invasive intraductal carcinoma was 85% among the cases. About 5% of the total diagnosed cancers in the case group were allocated to modularly carcinoma, invasive lobular carcinoma and Paget's disease. There was no relative frequency in specific blood group for these three types of cancer. The blood types ABO (Rh) and breast cancer type showed no significant relation (P = 0.2).
  
  
  CONCLUSIONS
  According to the obtained results from this study, there was no relative frequency in specific blood group for these three types of cancer and the blood type could not be influenced as a risk factor in breast cancer.
authors.affiliation: Internal Medicine Department, School of Medicine, Najafabad Islamic Azad University, Najafabad, Isfahan, Iran.
authors.forename: Amir Hossein Mirlohi
authors.initials: AH
authors.lastname: Flavarjani
authors.affiliation: School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Behnood
authors.initials: B
authors.lastname: Hedayatpour
authors.affiliation: Internal Medicine Department, School of Medicine, Najafabad Islamic Azad University, Najafabad, Isfahan, Iran.
authors.forename: Nasrollah
authors.initials: N
authors.lastname: Bashardoost
authors.affiliation: Department of Science, California State University, Stanislus, California, USA.
authors.forename: Sayed Mohammad
authors.initials: SM
authors.lastname: Nourian
keywords: Blood group; breast cancer; risk factor