Tumor weight significantly correlated with serum ionized calcium concentration(Spearman’s rank-order correlation: R = 0.254, P =0.004) and PTH expression (Spearman’s rank-order correlation: R =0.432, P < 0.001) and was inversely correlated with serum phosphateconcentration (Spearman’s rank-order correlation: R = –0.268,P = 0.002). The gene discussed is PTH; the disease is neoplasm.