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Elevated levels of telomerase activity in malignant pheochromocytoma

Although malignant pheochromocytoma is a life‐threatening illness, there is no excretory profile that is predictive of malignancy. Reliable prediction of malignant behavior on the basis of histopathology is also notoriously difficult. Although DNA ploidy can be a helpful indicator, aneuploidy per se is not considered to be a specific marker of malignancy. Mutations in p53 have been reported to occur frequently in cases of benign pheochromocytoma. Thus, molecular analysis of this protein is not a useful diagnostic tool. The authors analyzed telomerase activity in benign and malignant pheochromocytomas and assessed its utility as a prognostic marker.