Table 7.

Prevalence of BRCA1 and BRCA2 mutations among early onset breast cancer patients with or without familial history of breast or ovarian cancers in Korea

	Ahn et al. [26]	Kang et al. [23]	KOHBRA study-interim report [32]
No. of cases tested (Age)	183 (Age <35)	60 (Age <40)	513 (Age ≤40)
History of familial breast or ovarian cancers (%)	24 (13.1)	8 (22.0)	181 (32.0)
BRCA1 mutation (%)	13 (7.1)	6 (10.0)	48 (9.4)
BRCA2 mutation (%)	6 (3.3)	5 (8.3)	43 (8.4)
BRCA1/2 mutations (%)	19 (10.4)	11 (18.3)	91a (17.7)

^aTwo cases of both BRCA1 and BRCA2 mutations