Practical molecular pathologic diagnosis of pilocytic astrocytomas

Surgical Pathology Clinics
Gerald F Reis, Tarik Tihan

Abstract

The pilocytic astrocytoma is predominantly a tumor of childhood and the most common type of circumscribed astrocytoma. The indolent nature of this tumor allows for prolonged survival for most patients, rendering the disease a rather "chronic" one, with potential long-term sequelae that are occasionally related to treatment. Two critical features of this tumor are its tendency to remain dormant, or involute even after subtotal resection, and the exceptional anaplastic transformation, sometimes following adjuvant therapy. The biological behavior of pilocytic astrocytoma can often be related to molecular alterations in the MAPK pathway.

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