The AIB1 glutamine repeat polymorphism is not associated with risk of breast cancer before age 40 years in Australian women

Table 2 AIB1 genotype and risk of breast cancer

Genotype^a	Cases (n [%])	Controls (n [%])	OR (95% CI)^b
0	298 (76)	330 (76)	1.00 (reference)
1	86 (22)	97 (23)	0.97 (0.68–1.38)
2	9 (2)	5 (1)	2.17 (0.69–6.85)
1 or 2	95 (24)	102 (24)	1.03 (0.73–1.44)

^aGenotype defined as number of alleles with 26 or fewer repeats. ^bAdjusted for study centre (Melbourne/Sydney), reference age (years), country of birth (Australia/other), education level (three levels), marital status (ever/never), number of live births, height (cm), current oral contraceptive use (yes/no) and affected first-degree relative (yes/no). CI, confidence interval; OR, odds ratio.

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