PTH and breast cancer: Additionally, BC patients with the GG genotype (rs2736100) had higher parathyroid hormone (PTH) levels (40.64 ± 16.78 pg/mL) than heterozygotes (28.11 ± 10.67 pg/mL; p = 0.0400) and TT homozygotes (35.36 ± 10.82 pg/mL; p = 0.0469).