PTH and breast cancer: In terms of the routine biochemical parameters, Ca (p = 0.001), PTH (p = 0.001), serum creatinine (p = 0.012), and serum urea (p = 0.012) levels were found to be high in BC patients, while urine creatinine (p = 0.003) and serum uric acid (p < 0.001) levels were found to be significantly low.