Introduction: Breast cancer is one of the most common and feared health problems for wo men world wide, it is also the most common malignant disease in western wo men, the leading cause for cancer death within these cancer patients is due to cancer invasion and metastasis at distant sites. Aim: to compare certain risk factors of breast cancer between Baghdad's and Kirkuk's patients in order to determine which factor increases the risk o f breast cancer including: Age, Martial state, Educational level, Occupation, Age at marriage, Age at menarche, Age at menopause, Age of first pregnancy, Breast feeding, Oral contraceptive use and number of children. Method: Across sectional study was conducted on patients with d iagnosed breast cancer attending both Al-Yarmoo k teaching hospital and Kirku k oncology center from 1 st June 2018 till 1 st June 2019. The study included the patients with diagnosed breast cancer exclusively and conducted on females only, we met the patients and interviewed them face to face, asked the questions from our questioner that we already prepared . The questioner included 13 questions including age, age at diagnoses of disease , marital status , educational level, occupation, height and weight, age at marriage, age at menarche and menopause, age at first pregna ncy, breast feeding, and questions about oral contraceptive use. Result: Both in Baghdad and Kirkuk most of patients was 45 years or more with no significant differences between the two groups ,also there is no significant difference regarding marital status ,most of patients was married in both cities.In Baghdad most of patients was highly educated, wh ile in (50%) was not educated with significant differences and hence the significant differences concerning the occupation of patients where (66.4%) in Baghdad were workers while in Kirku k (65.38%) patients were house wives. Taking the age of menarche and menopause as a risk factors (45.9%) in Baghdad started menarche at age ≥12 co mpared to (90.38%) in Kirkuk with highly significant d ifference ,while no significant differences concerning menopause . In Bagh dad(58%) marry at ageless than18 year wh ile those in Kirkuk most of them (75%) marry at age equal or mo re than18 with significant difference, again significant differences between two study settings is present concerning age of first pregnancy, in Baghdad(25%) get first pregnancy at 14-18 years o ld while in Kirku k (32.68%) have never get pregnancy at all. No significant differences between two study settings concerning breast feeding, while h ighly significant difference concerning duration of using oral contraceptive, in Baghdad (43.7%) have <12 year using contraceptive pills while in Kirkuk (59.61%) never use. A significant differences also noticed concerning number of ch ildren with (22.9%) in Baghdad having 4-6 ch ild co mpared to (42.30%) in Kirkuk having only 1-3 ch ildren .No significant differences Mahgoob et al ( 2021): Comparati ve study regarding breast cancer risk factors
