Abstract
The development of advanced imaging techniques has increased the detection of subclinical pheochromocytomas. Because of the substantial proportions of subclinical pheochromocytomas, measurement of urine metanephrine concentrations is crucial due to detect or exclude pheochromocytoma. Although urine metanephrines are elevated in symptomatic subjects, diagnostic cut-offs according to the presence of adrenergic symptoms have not been studied. Pheochromocytomas patients who underwent adrenalectomy at Samsung Medical Center and a control group were compared to determine cut-off concentrations of urine metanephrines. An independent population was analyzed for urine metanephrines with different kits to validate the improvement in diagnostic accuracy using adjusted cut-offs. Symptom-dependent cut-offs of urine metanephrines were higher for symptomatic patients (307 μg/day in males, 235 μg/day in females for urine metanephrine, and 1,045 μg/day in males and 457 μg/day in females for urine normetanephrine) than for asymptomatic patients (206 μg/day in males, 199 μg/day in females for urine metanephrine, and 489 μg/day in males and 442 μg/day in females for urine normetanephrine). Symptom-dependent cut-offs of urine metanephrines improved a specificity from 92.7 % to 96.3 % and a high sensitivity of 97.8 % was maintained. Using the Symptom-dependent cut-offs raised diagnostic accuracy by 5.5 % (p <0.001). Similar trend was also observed in an independent population using different hormone kits. Using symptom-dependent cut-offs of urine metanephrines in symptomatic patients for pheochromocytomas resulted in a significant improvement in diagnostic accuracy in two separate cohorts.
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This study was supported by a grant from Dong-A ST (Seoul, Republic of Korea, project No. 2011-04-090) and from the Asan Institute for Life Sciences (Seoul, Republic of Korea, project No. 2014-1215). The funding source had no role in the oversight or design of the study, in the analysis or interpretation of the data, or in the decision to submit the manuscript for publication.
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Yoon Young Cho and Kee-Ho Song are the joint first authors.
Seung Hun Lee and Jae Hyeon Kim are the joint senior authors.
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Cho, Y.Y., Song, KH., Kim, Y.N. et al. Symptom-dependent cut-offs of urine metanephrines improve diagnostic accuracy for detecting pheochromocytomas in two separate cohorts, compared to symptom-independent cut-offs. Endocrine 54, 206–216 (2016). https://doi.org/10.1007/s12020-016-1049-8
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DOI: https://doi.org/10.1007/s12020-016-1049-8