CACNB4 and alopecia: Among the SNPs analyzed in the GWAS, we identified a locus that reached genome-wide significance (rs3820706 near CACNB4, minimum P = 8.13 × 10-9, ORrec = 3.71, 95% CI: 2.24 to 6.15) and five additional loci that revealed suggestive association with chemotherapy-induced alopecia with a P value of <10-6 (Additional file 3 and Table 1).