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PTEN is a potent suppressor of small cell lung cancer

Min Cui1, Arnaud Augert, Michael Rongione

  • 1Authors' Affiliations: Department of Embryology, Carnegie Institution, Baltimore, Maryland; 2Fred Hutchinson Cancer Research Center, Seattle, Washington; and 3Department of Biomedical Sciences, Cornell University, Ithaca, New York.

Molecular Cancer Research : MCR
|February 1, 2014
PubMed
Abstract

Insights

Targeting the PTEN pathway accelerates small cell lung carcinoma (SCLC) and liver metastasis in mice. This suggests PTEN pathway inhibition may be a viable therapy for certain SCLC patients.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Small cell lung carcinoma (SCLC) is a highly aggressive cancer with poor outcomes.
  • The role of the PTEN/PIK3CA pathway in SCLC development and metastasis is not well understood.

Purpose of the Study:

  • To investigate the functional relevance of the PTEN/PIK3CA pathway in SCLC using a genetically engineered mouse model.
  • To determine the impact of PTEN inactivation on SCLC progression and metastasis.

Main Methods:

  • Utilized an AdenoCre-driven mouse model with inactivated Rb and p53.
  • Inactivated one or both alleles of PTEN in the mouse model.
  • Performed exome analyses to assess mutation burden.

Main Results:

  • Inactivation of one PTEN allele accelerated SCLC and liver metastasis.
  • Exome analyses revealed a low mutation burden in mouse SCLC.
  • Inactivation of both PTEN alleles resulted in nonmetastatic adenocarcinoma with neuroendocrine differentiation.

Conclusions:

  • PTEN inactivation accelerates SCLC and metastasis, highlighting the PTEN pathway's critical role.
  • This study provides a model for testing PI3K pathway inhibitors as targeted therapies for SCLC subsets.

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