RESUMEN
PURPOSE: To see if changes in tumor/blood glutathione (GSH) levels after one fraction of radiotherapy can be correlated with the treatment response in patients with carcinoma of the uterine cervix. METHODS AND MATERIALS: The study was done on 45 patients with squamous cell carcinoma of the uterine cervix, FIGO Stages IIB (17 patients) and IIIB (28 patients). Stage IIB patients received 35 Gy of cobalt-60 external radiotherapy (RT) in 16 fractions over 4 weeks with a concurrent high-dose-rate intracavitary dose of 8.5 Gy to point A once a week. Stage IIIB patients were given 45 Gy of RT in 20 fractions over 5 weeks, followed by two doses of intracavitary therapy once a week. Blood and tumor samples were collected before and after one dose of RT and GSH was estimated. Tumor response was assessed clinically at 1 month after treatment. RESULTS: Glutathione levels in both blood and tumor showed a significant decrease after one fraction of RT, but the degree of decrease varied among patients. There was a good correlation between the extent of GSH decrease and the tumor response. All patients who had complete response (CR) (seven Stage IIB and eight Stage IIIB) showed > or =70% decrease in both tumor and blood GSH, while those who had <50% regression (NR) (five Stage IIB and 13 Stage IIIB) showed <50% decrease in GSH. The partial responders recorded an intermediate level (50-70%) of depletion in blood and tumor GSH. CONCLUSIONS: The results indicate that the changes in tumor/blood GSH levels after one fraction of RT could serve as an index of tumor response to therapy and may help in identifying radioresistant tumors, at least in the case of cervix carcinoma.
Asunto(s)
Carcinoma de Células Escamosas/metabolismo , Carcinoma de Células Escamosas/radioterapia , Glutatión/efectos de la radiación , Neoplasias del Cuello Uterino/metabolismo , Neoplasias del Cuello Uterino/radioterapia , Biomarcadores/sangre , Carcinoma de Células Escamosas/patología , Femenino , Glutatión/metabolismo , Humanos , Estadificación de Neoplasias , Neoplasias del Cuello Uterino/patologíaRESUMEN
Cyclophosphamide induced a depletion in liver glutathione (GSH) and high rate of lipid peroxidation. GSH depletion was evident from 20 min onwards and the maximum depletion was observed at 3 hr post treatment. Lipid peroxidation was significant only after the maximum depletion of GSH. Pretreatment with either MPG or WR-77913 individually, or in combination could prevent the depletion of GSH and induction of lipid peroxidation after cyclophosphamide treatment.
Asunto(s)
Amifostina/análogos & derivados , Ciclofosfamida/antagonistas & inhibidores , Glutatión/metabolismo , Peroxidación de Lípido/efectos de los fármacos , Tiopronina/farmacología , Amifostina/farmacología , Animales , Femenino , Masculino , RatonesRESUMEN
The protective effect of WR-1065 against the side effects of Adriamycin was studied in tumor bearing mice. It has been noticed that WR-1065 pretreatment improved the Adriamycin toxicities such as increased enzyme levels, pathological lesions in lung, liver and heart and increased rate of lipid peroxidation, without reducing its anticancer property.