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  • Title: Glutathione S-transferase expression in renal cell carcinoma: a new marker of differentiation.
    Author: Grignon DJ, Abdel-Malak M, Mertens WC, Sakr WA, Shepherd RR.
    Journal: Mod Pathol; 1994 Feb; 7(2):186-9. PubMed ID: 8008741.
    Abstract:
    Expression of two GST isoenzymes (alpha and pi) was assessed immunohistochemically in 46 cases of renal cell carcinoma (RCC) for which clinical follow-up was available. In the normal kidney GST alpha stained most intensely in the proximal convoluted tubules and GST pi in distal tubules/collecting ducts. All 46 tumors studied stained positively for GST alpha with most demonstrating strong cytoplasmic and nuclear reactivity. GST pi immunostaining was positive in 35/46 cases (76%). Five-year survival for patients with GST pi positive tumors was 88% versus 50% for those with GST pi negative tumors (P < 0.008). Loss of GST mRNA has been reported in RCC and it has been suggested that this may represent a dedifferentiation program in RCC. These data support this hypothesis and further indicate a potential value for GST pi as a prognostic indicator in RCC.
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