title: Higher frequency of left-breast cancer: a possible explanation.
abstract: A study of 1027 women with unilateral breast cancer showed that ipsilateral breast cancer was more common before age 45 and contralateral thereafter. The data suggest a possible explanation of the higher incidence of left-breast cancer in American women. A higher percentage of left-handed women developed breast cancer before age 45, but the over-all incidence of unilateral breast cancer was not greater in left-handed women than in right-handed or ambihanded subjects.
mesh_terms: D000328:Adult; D000367:Age Factors; D001940:Breast / Q000473:pathology; D001943:Breast Neoplasms / Q000473:pathology*; D005260:Female; D007839:Functional Laterality; D006801:Humans; D008875:Middle Aged