MP-16.19: FISH analysis of PTEN/mmca1 gene in patients with renal cell carcinoma treated exclusivelly with surgery

Zequi, S.C.; Campos, Elisabete Aparecida; Guimarães, Gustavo Cardoso; Fonseca, Francisco Paulo da; Bachega, Wilson; Werneck, Isabela; Soares, Fernando Augusto; Lopes, Ademar

doi:10.1016/j.urology.2007.06.479

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“…There have been conflicting reports in the literature regarding the genomic status of PTEN , with investigators reporting a frequency of PTEN deletions ranging between 4% and 42% in primary RCC 25‐27. To our knowledge, PTEN gene status has not been reported in metastatic RCC lesions.…”

Section: Discussionmentioning

confidence: 90%

The mammalian target of rapamycin pathway is widely activated without PTEN deletion in renal cell carcinoma metastases

Youssif

Fahmy

Koumakpayi

et al. 2010

Cancer

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BACKGROUND: Inhibitors of the mammalian target of rapamycin (mTOR) are emerging as promising therapies for metastatic renal cell carcinoma (RCC). Because rational treatment strategies require understanding the activation status of the underlying signaling pathway being targeted at the desired stage of disease, the authors examined the activation status of different components of the mTOR pathway in RCC metastases and matched primary tumors. METHODS: The authors immunostained metastatic RCC samples from 132 patients and a subset of 25 matched primary RCCs with antibodies against phosphatidylinositol 3 0 -kinase, PTEN, phospho-Akt, phospho-mTOR, and p70S6. PTEN genomic status was assessed by fluorescent in situ hybridization. Marker expression was correlated to clinicopathologic variables and to survival. RESULTS: The mTOR pathway showed widespread activation in RCC metastases of various sites with strong correlation between different components of this signaling cascade (P<.0001), but without significant PTEN genomic deletion. Only cytoplasmic phospho-mTOR showed independent prognostic significance (P ¼ .029) and fidelity between primary RCCs and their matched metastases (P ¼ .004). CONCLUSIONS: Activation of various components of the mTOR signaling pathway in metastatic RCC lesions across various tumor histologies, nuclear grades, and metastatic sites suggests the potential for vertical blockade of multiple steps of this pathway. Patient selection may be improved by mTOR immunostaining of primary RCC. Cancer 2011;117:290-300.

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Section: Discussionmentioning

confidence: 90%