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Glutathione‐associated enzymes in head and neck squamous cell carcinoma and response to cisplatin‐based neoadjuvant chemotherapy
Author(s) -
Cabelguenne Arnauld,
Loriot MarieAnne,
Stucker Isabelle,
Blons Hèléne,
KoumBesson Elisabeth,
Brasnu Daniel,
Beaune Philipe,
Laccourreye Ollivier,
LaurentPuig Pierre,
De Waziers Isabelle
Publication year - 2001
Publication title -
international journal of cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.475
H-Index - 234
eISSN - 1097-0215
pISSN - 0020-7136
DOI - 10.1002/ijc.1392
Subject(s) - gstp1 , head and neck squamous cell carcinoma , genotype , chemotherapy , glutathione , carcinogenesis , biology , medicine , cancer research , oncology , cisplatin , cancer , head and neck cancer , gastroenterology , enzyme , gene , genetics , biochemistry
Glutathione S‐transferases (GSTs) are metabolic phase II enzymes that promote reactive metabolite elimination by conjugating them to glutathione (GSH). Because of their important role in xenobiotic metabolism and detoxification, they have been implicated in carcinogenesis processes, especially epithelium transformation. Moreover, their influence on response to chemotherapy in cancer patients has been demonstrated. Genetic polymorphisms for GSTM1, GSTT1 and GSTP1 have been found in human populations and have been shown to have phenotypic consequences. To investigate the role of GST enzymes in carcinogenesis and in response to chemotherapy in patients with head and neck squamous cell carcinoma (HNSCC), GSTP1, GSTM1 and GSTT1 were studied prospectively in a large series of HNSCC patients. Correlations between GST alterations, p53 mutation status and clinical response to chemotherapy were investigated. We showed that the risk of developing laryngeal cancer was increased by 2.6‐fold [95% CI 1.6–6.1] in patients with the GSTM1 null genotype and by 2.8‐fold [95% CI 0.9–8.1] in patients with the homozygous GSTP1 val105 genotype. Furthermore, individuals with this latter genotype were over‐represented in the p53 mutation group ( p = 0.05). After storage duration and hemolysis adjustement, a significantly lower plasmatic GSTP1 level was observed in complete responders compared with partial and non‐responders (mean: 4.4 ± 0.06 μg/l, 4.7 ± 0.06 μg/l and 4.7 ± 0.07 μg/l; p = 0.05), respectively. The prevalence of p53 ‐mutated tumors was significantly higher in the group of non‐responders (81%) compared with partial (60%) and complete responders (64%) ( p = 0.05). Two types of multivariate analysis were performed including parameters that have been shown to influence response to chemotherapy significantly in univariate analysis. p53 mutations and high tumor stage are independent factors of non‐response to chemotherapy, whereas plasmatic GSTP1 levels and low tumor stage are independent factors of complete response. Our data suggest that GST enzymes are associated with larynx cancer and that their use as predictive factors and treatment targets should be further explored. © 2001 Wiley‐Liss, Inc.