Men and women differ in thyroidal C-cell mass and calcitonin secretion. This difference may have implications for the definition of calcitonin thresholds to distinguish sporadic C-cell hyperplasia from occult medullary thyroid cancer. This retrospective study examined the hypothesis that gender-specific calcitonin thresholds predict occult medullary thyroid cancer more accurately among patients with increased basal calcitonin levels than unisex thresholds. A total of 100 consecutive patients were evaluated with occult sporadic C-cell disease no larger than 10 mm who were referred for increased basal calcitonin levels and underwent pentagastrin stimulation preoperatively at this institution. Altogether, gender-specific calcitonin thresholds predicted medullary thyroid cancer better than unisex thresholds. At lower (
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