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Brief Communications

Nature 436, 642 (4 August 2005) | doi:10.1038/436642a

Tumour biology:  Senescence in premalignant tumours

Manuel Collado1, Jesús Gil2, Alejo Efeyan1, Carmen Guerra1, Alberto J. Schuhmacher1, Marta Barradas1, Alberto Benguría3, Angel Zaballos3, Juana M. Flores4, Mariano Barbacid1, David Beach5 & Manuel Serrano1

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Oncogene-induced senescence is a cellular response that may be crucial for protection against cancer development1, 2, but its investigation has so far been restricted to cultured cells that have been manipulated to overexpress an oncogene. Here we analyse tumours initiated by an endogenous oncogene, ras, and show that senescent cells exist in premalignant tumours but not in malignant ones. Senescence is therefore a defining feature of premalignant tumours that could prove valuable in the diagnosis and prognosis of cancer.

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