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The  HOXB13  p.G84E mutation has been firmly established as a prostate cancer susceptibility allele. Although  HOXB13  also plays a role in breast tumor progression, the association of  HOXB13  p.G84E with breast cancer risk is less evident. Therefore, we comprehensively interrogated the entire  HOXB13  coding sequence for mutations in 1,250 non- BRCA1/2  familial breast cancer cases and 800 controls. We identified two predicted deleterious missense mutations, p.G84E and p.R217C, that were recurrent among breast cancer cases and further evaluated their association with breast cancer risk in a larger study. Taken together, 4,520 familial non- BRCA1/2  breast cancer cases and 3,127 controls were genotyped including the cases and controls of the whole gene screen. The concordance rate for the genotyping assays compared with Sanger sequencing was 100%. The prostate cancer risk allele p.G84E was identified in 18 (0.56%) of 3,187 cases and 16 (0.70%) of 2,300 controls (OR = 0.81, 95% CI = 0.41–1.59,  P  = 0.54). Additionally, p.R217C was identified in 10 (0.31%) of 3,208 cases and 2 (0.087%) of 2,288 controls (OR = 3.57, 95% CI = 0.76–33.57,  P  = 0.14). These results imply that none of the recurrent  HOXB13  mutations in the Dutch population are associated with breast cancer risk, although it may be worthwhile to evaluate p.R217C in a larger study.

Recurrent HOXB13 mutations in the Dutch population do not associate with increased breast cancer risk