MCTP1 and breast cancer: We also observed one additional noteworthy but not genome-wide significant association in the 5-year breast cancer-specific survival analyses in the subgroup of patients who received Tamoxifen with variant rs72775397, situated in the 3′ untranslated region of MCTP1 (HR [95% CI] 1.36 [1.21,1.53], P = 1.8E−07, BFDP = 0.11, per C allele).