Breast cancer laterality among Egyptian patients and its association with treatments and survival

AbstractBackground and aimBreast cancers (BCs) involve the left side (LS) more than the right side (RS). Among the Egyptians, neither BC laterality nor its association with demographic factors, tumor locations, treatments and outcomes were previously reported.Patients and methodsLaterality was analyzed among 5459 BCs from the Gharbiah population-based cancer registry covering >5% of the Egyptian population. Cox proportional model was used to assess the independent effect of stage, ER, and laterality on overall survival (OS).ResultsIn Egypt, BCs involve LS more than RS with LS-to-RS ratio (LRR) of 1.16. LS predominance was evident among men and women and both younger (