TTC28 and breast cancer: Similarly, variant rs738200, located on locus 22q12 in the tetratricopeptide repeat domain 28 gene (TTC28), falls within a 610 kb interval (Build 37 coordinates chr22: 28,314,612-28,928,858) on chromosome 22 recently shown to be associated with breast cancer risk (smallest P = 8.2×10−22, for rs62237573).