Gatekeeper for endometrium: the PTEN tumor suppressor gene.

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Abstract
The complexity of genetic alterations in invasive cancers and the heterogeneity of tumor cell populations hamper attempts to translate molecular understanding at the genetic level into accurate diagnostic and therapeutic approaches. Delineation of molecular changes in the initial stages of tumor development is, therefore, highly desirable because such information can be translated into more effective cancer prevention and treatment strategies. Significant advances have been made in understanding the molecular events that occur as normal tissues evolve—often into precancerous lesions, some of which eventually progress to cancer. In some cancers, such as colorectal carcinomas and gliomas, details of distinct molecular pathways have been identified. In most cancers, however, no consistent pattern of genetic alteration is convincingly linked to the initiation or progression of the disease.

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