head and neck neoplasms/glutathione

We examined the correlation between response to platinum-based chemotherapy and expression of glutathione S-transferase (GST), gamma-GGT (both by immunohistochemistry) and gamma-GCS (by in situ hybridization) in 51 patients with head and neck cancer, who received a total of 56 courses of

BACKGROUND Cytochrome P450 (CYP) and glutathione S-transferase (GST) gene variants have been intensively investigated for their implication in the development of different neoplasms. METHODS In the present study, we analyzed genetic polymorphisms of CYP1A1, GSTM1, GSTP1, and GSTT1 in 127 head and

OBJECTIVE To examine the prognostic significance of expression of glutathione s-transferase pi (GST-pi) and p53 in patients treated with radiation alone for locally advanced head and neck cancer [Radiation Therapy Oncology Group (RTOG), trial 9003] or radiation +/- concomitant chemotherapy as

Glutathione labelled with 99mTc was used to study blood clearance and normal distribution in 3 healthy volunteers and in 10 patients with biopsy-proven tumors in the head and neck region. Static scintigrams were obtained at 1, 3, 6, and 24 h. ROIs over tumors and normal soft tissues were compared to

Twenty-two patients with advanced head and neck carcinoma were treated with 5FU 400 mg-2 m-1 week and folinic acid 500 mg m-2 week-1 plus CDDP in escalating doses from 20 to 40 mg m-2 week-1 without forced diuresis. Reduced glutathione at the dose of 1.5 g m-2 was employed to protect patients from

Drug resistance is a major problem in chemotherapy of squamous cell head and neck cancers (SCHNC). Since glutathione (GSH) plays a crucial role in mediating tumor cell resistance against various toxic insults, GSH metabolism in SCHNC xenografts was investigated. Xenografts from lymph node metastases

OBJECTIVE Glutathione has been shown to be an effective chemoprotector against cisplatin-induced side effects in patients with ovarian cancer. In view of this fact, we performed a randomized clinical pilot-trial in the management of other solid tumors in order to compare application of Glutathione

Neoadjuvant cisplatin-based chemotherapy has been widely used in the last decade for organ preservation or unresectable disease in advanced stage head and neck cancer. We examined the expression of a series of tumor markers that have been associated with chemotherapy resistance in pretreatment

OBJECTIVE To correlate cellular glutathione content and gamma-glutamyl cysteine synthetase (gamma GCS) mRNA expression with cisplatin sensitivity in a panel of seven head and neck squamous cancer cell lines. METHODS Cisplatin IC50 was determined for each cell line using a sodium tetreazolium (XTT)

In this study glutathione (GSH), a natural tripeptide which plays an important role in detoxification reactions, protecting cells against damage from xenobiotics, has been labelled with 99Tc(m) for the demonstration of head and neck cancer. Twenty-eight patients (10 females and 18 males) with

Since glutathione is considered to be an important mediator of cancer cell resistance to cisplatin-based chemotherapy, we investigated glutathione in head and neck cancer by both laboratory and clinical investigations. METHODS Intracellular glutathione concentration was measured in 7 different cell

BACKGROUND Several enzymatic systems, including glutathione S-transferases, are involved in the metabolism of environmental agents. The absence of glutathione S-transferases mu (GSTM1) and theta (GSTT1) results in decreased detoxification of carcinogens, for example, chemicals in cigarette smoke.

The glutathione S-transferases (GSTs) play an important role in the cell's defense against toxic substances. The GSTs are a family of enzymes produced by several genes that interact with distinct but overlapping substrates and that may play a role in resistance of tumor cells to several

BACKGROUND Head and neck squamous cell carcinoma (HNSCC) accounts for about 6% of all malignant cancers. In the epidemiology of oral cavity neoplasm, important risk factors include: tobacco smoking, alcohol abuse, bad oral hygiene, papilloma virus infection, riboflavin and iron