351
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Rojas A, Stewart FA, Smith KA, Soranson JA, Randhawa VS, Stratford MR, Denekamp J. Effect of anemia on tumor radiosensitivity under normo and hyperbaric conditions. Int J Radiat Oncol Biol Phys 1987; 13:1681-9. [PMID: 3667375 DOI: 10.1016/0360-3016(87)90165-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The effect of chronic anemia on tumor radiosensitivity in a murine tumor has been investigated. Anemia was induced by bilateral kidney irradiation given several months before tumor implantation. Anemic, anemic transfused, and normal non-anemic age-matched tumor bearing animals were irradiated with X rays (2 F/24 hr) either in air, air plus misonidazole, or under hyperbaric oxygen. The most resistant response was that of tumors grown in normal mice treated in air. Anemia produced an increase in radiosensitivity which was further enhanced by red blood cell replacement. The most sensitive overall response was seen in the anemic-transfused group treated with HBO.
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352
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Belloso RM, Benaim de Hammer V, Sánchez E, Mariñan I, Souchón EA, Santaella C, Rojas A. [Benefits of the nutritional support in esophageal pathologies]. G.E.N 1987; 41:132-7. [PMID: 3151889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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353
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Dartevelle P, Chapelier A, Navajas M, Levasseur P, Rojas A, Khalife J, Lafontaine E, Merlier M. Replacement of the superior vena cava with polytetrafluoroethylene grafts combined with resection of mediastinal-pulmonary malignant tumors. Report of thirteen cases. J Thorac Cardiovasc Surg 1987; 94:361-6. [PMID: 3626598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
From 1979 to 1986, we replaced the superior vena cava with polytetrafluoroethylene grafts in 13 patients to enable resection of malignant mediastinal or pulmonary tumors. Five prostheses could be interposed between a tumor-free proximal superior vena cava and right atrium while eight required separate innominate anastomoses (Y grafts constructed intraoperatively). There were no deaths. Phlebograms obtained 15 to 30 days after the operation demonstrated patency in 12 of 13 patients. Long-term (average 24 months) patency was evident in eight. Five patients are alive at 1, 3, 40, 49, and 60 months, a cumulative survival rate of 27% at 3 years.
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354
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Campino C, Bruggendieck B, Pumarino H, Rojas A, Ferreiro F. [Development of a radioimmunoassay for mid-parathyroid hormone fragment. Comparison of 2 commercial kits for carboxyl terminal]. Rev Med Chil 1987; 115:763-7. [PMID: 3453541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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355
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Schenone H, Rojas A, Villarroel F, Schenone H. [Epidemiology of human and animal hydatidosis in Chile, with special reference to the 1975-1984 decade]. BOLETIN CHILENO DE PARASITOLOGIA 1987; 42:49-58. [PMID: 3504154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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356
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Schenone H, Contreras MC, Castro M, Villarroel F, Rojas A. [Epidemiology of toxoplasmosis in Chile. IV. Prevalence of infection in domestic animals from rural-periurban localities of the first 7 regions of Chile, 1982-1985]. BOLETIN CHILENO DE PARASITOLOGIA 1987; 42:76-9. [PMID: 3504159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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357
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Schenone H, Contreras MC, Salinas P, Tello P, Sandoval L, Peña AM, Villarroel F, Rojas A. [Epidemiology of toxoplasmosis in Chile. III. Prevalence of the human infection, studied by means of indirect hemagglutination reaction, in the Metropolitan region of Santiago. 1982-1987]. BOLETIN CHILENO DE PARASITOLOGIA 1987; 42:28-32. [PMID: 3442591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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358
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Schenone H, Contreras MC, Salinas P, Sandoval L, Peña AM, Villarroel F, Rojas A. [Epidemiology of toxoplasmosis in Chile. II. Prevalence of human infection, studied by means of indirect hemagglutination reaction, in Regions IV, V and VI, 1982-1986]. BOLETIN CHILENO DE PARASITOLOGIA 1986; 41:82-6. [PMID: 3620082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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359
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Rojas A, Stewart FA, Soranson JA, Smith KA, Denekamp J. Fractionation studies with WR-2721: normal tissues and tumour. Radiother Oncol 1986; 6:51-60. [PMID: 3012656 DOI: 10.1016/s0167-8140(86)80109-8] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
We have studied the ability of WR-2721 to protect skin, kidney and an anaplastic murine tumour against single or fractionated X-ray treatments. Skin reactions, four different kidney assays, regrowth delay and local control of tumours have been used to construct dose-response curves from which the degree of radioprotection can be quantified as a protection factor. Low doses of WR-2721 (0.2-0.3 mg X g-1) were used before each of 1, 5 or 10 fractions. The degree of protection was similar in all three systems and it did not change significantly with fractionation.
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360
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Schenone H, Contreras MC, Salinas P, Sandoval L, Peña AM, Rodríguez H, Villarroel F, Rojas A. [Epidemiology of toxoplasmosis in Chile. I. Prevalence of human infection, studied by the indirect hemagglutination reaction, in the 1st 3 regions. 1982-1985]. BOLETIN CHILENO DE PARASITOLOGIA 1986; 41:36-9. [PMID: 3828030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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361
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Schenone H, Villarroel F, Contreras MC, Borgoño JM, Sandoval L, Rojas A, Valdés J, López IM. [Chagas' disease in Chile. Rural and periurban Sectors. Positivity rates of the indirect hemagglutination reaction for the diagnosis of the parasitosis according to the number of persons examined per housing]. BOLETIN CHILENO DE PARASITOLOGIA 1986; 41:27-30. [PMID: 3103642] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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362
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Schenone H, Villarroel F, Rojas A. [Laboratory study on measuring the insecticidal activity, on Triatoma infestans, of lindane stored for 20 years]. BOLETIN CHILENO DE PARASITOLOGIA 1986; 41:31-6. [PMID: 2435299] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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363
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Contreras P, Rojas A, Biagini L, González P, Massardo T. Regression of metastatic adrenal carcinoma during palliative ketoconazole treatment. Lancet 1985; 2:151-2. [PMID: 2410748 DOI: 10.1016/s0140-6736(85)90251-x] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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364
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Schenone H, Contreras MC, Borgoño JM, Rojas A, Villarroel F, Valdés J. [Chagas' disease in Chile. Rural and periurban sectors of the endemo-enzootic area. Relationship between housing conditions, domicilliary triatomid infestation and infection by Trypanosoma cruzi of the vector, humans and domestic mammals. 1982-1985]. BOLETIN CHILENO DE PARASITOLOGIA 1985; 40:58-67. [PMID: 3939408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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365
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Schenone H, Christensen HA, de Vásquez AM, González C, Méndez E, Rojas A, Villarroel F. [Feeding sources of domestic triatomas and their epidemiological involvement in relation to Chagas' disease in rural areas of 7 regions of Chile]. BOLETIN CHILENO DE PARASITOLOGIA 1985; 40:34-8. [PMID: 3939406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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366
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Valderrama M, Scotti M, Rojas A. Fluorinated barrelene-ruthenium(II) complexes with anionic chelating ligands. Polyhedron 1985. [DOI: 10.1016/s0277-5387(00)87232-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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367
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Schenone H, Contreras MC, Borgoño JM, Rojas A, Villarroel F. [Congenital Chagas' disease in Chile. Longitudinal study of the reproductivity of women with or without Chagas' disease and of some parasitological and clinical parameters of them and their corresponding children]. BOLETIN CHILENO DE PARASITOLOGIA 1985; 40:24-9. [PMID: 3939404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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368
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Contreras P, Altieri E, Liberman C, Gac A, Rojas A, Ibarra A, Ravanal M, Serón-Ferré M. Adrenal rest tumor of the liver causing Cushing's syndrome: treatment with ketoconazole preceding an apparent surgical cure. J Clin Endocrinol Metab 1985; 60:21-8. [PMID: 3964792 DOI: 10.1210/jcem-60-1-21] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Ketoconazole, an imidazole derivative known to inhibit cytochrome P450-dependent adrenal enzymes was given to a patient with a functioning adrenal rest tumor of the liver in preparation for surgery. The drug was administered in a stepwise manner for 42 days starting with 400 mg and reaching 1 g the last 4 weeks of the trial. Clear clinical improvement was evident early in the trial and was associated with evidence of amelioration of her hypercortisolism and striking changes in serum and urinary levels of steroid hormones and metabolites. Sex steroids in serum and urine fell dramatically from the first day to the end of the trial. Urinary 17-ketosteroid excretion fell from a basal average of 139 mg/24 h to near normal levels within a week of therapy; serum testosterone fell from a basal level of 2.4 to 0.18 ng/ml; serum 17 beta-estradiol fell likewise from 1096 to 150 pg/ml. In contrast, cortisol levels in serum and urine increased in the first 2 weeks of the trial and subsequently fell to values below the basal levels. Similarly, serum 17 alpha-OH-progesterone levels increased 63% above the basal levels by day 6 of the trial and declined afterwards. Nine months after successful tumor resection the patient is apparently cured as judged by steroid hormone levels and physical appearance. We conclude that ketoconazole was effective in blocking tumoral steroidogenesis which resulted in clinical benefit.
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369
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Rojas A, Smith KA, Soranson JA, Minchinton AI, Middleton RW, Denekamp J. Enhancement of misonidazole radiosensitization by buthionine sulphoximine. Radiother Oncol 1984; 2:325-32. [PMID: 6522642 DOI: 10.1016/s0167-8140(84)80075-4] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The influence of glutathione (GSH) depletion on the radiation response and on the radiosensitizing efficiency of misonidazole (miso) has been studied in two types of mouse tumour and in mouse skin. Buthionine sulphoximine (BSO) has been administered in a variety of regimes, leading to a maximal depletion of GSH to 37% of control values in one tumour (CA MT) and 61% in the other (SA FA). Pretreatment with BSO did not alter the radiosensitivity of either tumour when treated with X-rays. It had a slight effect on the sensitizing efficiency of miso, corresponding to a factor less than three, which was detectable only at the highest X-ray doses used. No enhancement of miso efficiency was seen with 5 daily fractions. Prolonged administration of BSO resulted in a slight radiosensitization of mouse skin. When combined with miso the effect was very small and was only detectable at high X-ray doses. BSO however produced a marked enhancement of the acute toxicity of miso, as judged by lethality after large single doses.
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370
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Rojas A, Denekamp J. The influence of X ray dose levels on normal tissue radioprotection by WR-2721. Int J Radiat Oncol Biol Phys 1984; 10:2351-6. [PMID: 6096318 DOI: 10.1016/0360-3016(84)90244-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
A variation in the degree of radioprotection by WR-2721 with X ray dose level is detectable in several normal tissue studies. A similar effect in tumors has been attributed to differential protection of oxic and hypoxic cells. For normal tissues it was previously postulated that it resulted from greater protection of 1 hit damage at low doses, with less protection of multihit damage. However, more extensive analysis of the normal tissue data, including both single dose and fractionated results show that it is not a universal effect in all normal tissues. It now seems more likely that varying PF values result from differential protection of cells at different oxygen tensions, even though the heterogeneity of oxygenation may not be detectable in the response to X rays alone.
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371
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Rojas A, Soranson J, Smith K, Minchinton A, Middleton R, Denekamp J. Effect of glutathione depletion on radiosensitivity in vivo. Int J Radiat Oncol Biol Phys 1984. [DOI: 10.1016/0360-3016(84)90562-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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372
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Williams MV, Rojas A, Denekamp J. Tumor sensitization and protection: influence of stromal injury on estimates of dose modification. Int J Radiat Oncol Biol Phys 1984; 10:1545-9. [PMID: 6090359 DOI: 10.1016/0360-3016(84)90500-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Tumor regrowth delay is an assay which reflects tumor cell kill but can be modified by growth rate changes resulting from damage to the stroma (tumor bed effects). If the stromal damage is modified by radiosensitizers and radioprotectors to a different degree from the tumor cells, the overall measurement of dose modifying factors may be influenced by the choice of a regrowth size for the growth delay analysis. We have studied the response of two mouse tumors; a fibrosarcoma which showed only a small TBE and a carcinoma which showed a very large TBE. Sensitizer enhancement ratios and protection factors have been obtained by assessing regrowth to a variety of endpoint sizes. The dose modifying effects on the stroma have then been determined by analyzing the regrowth rates of tumors after irradiation. The choice of endpoint size modified both the sensitizer enhancement ratio and the protection factor for both tumors. It appears that stromal damage may be the cause of the radioprotection observed in the carcinoma, whereas direct tumor cell radioprotection is indicated in the fibrosarcoma. Both direct tumor cell killing and cell death secondary to stromal damage will play an important role in determining the local control of irradiated tumors.
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373
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Minchinton AI, Rojas A, Smith KA, Soranson JA, Shrieve DC, Jones NR, Bremner JC. Glutathione depletion in tissues after administration of buthionine sulphoximine. Int J Radiat Oncol Biol Phys 1984; 10:1261-4. [PMID: 6469748 DOI: 10.1016/0360-3016(84)90329-8] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Buthionine sulphoximine (BSO) an inhibitor of glutathione (GSH) biosynthesis, was administered to mice in single and repeated doses of 0.5, 1 and 5 mmol kg-1 (i.p.). The resultant pattern of GSH depletion was studied in liver, kidney, skeletal muscle and three types of murine tumor. Liver and kidney exhibited a rapid depletion to GSH levels of ca. 20% of controls after single doses of 1-5 mmol kg-1 BSO. Muscle was depleted to a similar level, but at a slower rate after a single dose. All three tumors required repeated administration of BSO over several days to obtain a similar degree of depletion to that shown in the other tissues.
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374
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Flores B, Hernández G, Lepe A, Contreras MC, Sandoval L, Villarroel F, Rojas A, González O, Schenone H. [Epidemiology of Chagas' disease in Chile. Rural sectors. Domiciliary triatomid infestation and Trypanosoma cruzi infection of the vector and domestic mammals in Region V 1983]. BOLETIN CHILENO DE PARASITOLOGIA 1984; 39:62-65. [PMID: 6443179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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375
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Villarroel F, Rojas A, Contreras MC, Schenone H. [Epidemiology of Chagas' disease in Chile. Rural sectors. Domiciliary triatomid infestation and Trypanosoma cruzi infection of vectors and domestic mammals of the metropolitan region]. BOLETIN CHILENO DE PARASITOLOGIA 1984; 39:65-8. [PMID: 6443180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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