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Preoperative PTH is higher in patients with low EC50 tumors. Scatter plots of individual preoperative PTH levels among patients with high EC50 tumors (n = 18) and low EC50 tumors (n = 11). Horizontal black lines represent the mean preoperative PTH levels for each group. The mean preoperative PTH level in low EC50 tumors is significantly higher than in high EC50 tumors (P = 0.0171 by 2-tailed Student t test).
