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Biomedical subjects

A Torres

Publications and source records attributed to A Torres.

At least 703 records · Page 39Linked to original sources
PubMed1981

Physico-chemical and analytical studies on plafibride.

Physico-chemical and analytical studies on N-2-(p-chlorophenoxy)-isobutyryl)-N'-morpholinomethylurea (plafibride, ITA 104) are reported. Besides the usual analytical data, spectral (UV, IR, NMR, MS) and chromatographic (HPLC, TLC) properties are described. As to chemico-analytical procedures, ITA 104 is detectable by titrimetric and spectralphotometric methods and by thin-layer chromatography.

Chemical Phenomena↗
PubMed1981

Pharmacokinetic approach of plafibride in rat.

The serum concentration of N-2-(p-chlorophenoxy)-isobutyryl-N'-morpholinomethylurea (plafibride, ITA 104) and its metabolites was measured in the rat after oral and intravenous administration of the drug. Plafibride was distributed in the rat according to an open two-compartment model. Moreover, 2-(p-chlorophenoxy)isobutyrylurea and clofibric acid were detected. In the urine, 81.7% of the administered dose was recovered in the form of free clofibric acid, 0.8% as plafibride itself and 1.1% as 2-(p-chlorophenoxy)isobutyrylurea. The amount of plafibride and its metabolites present in the feces was practically negligible. A mechanistic scheme for the degradation of plafibride is proposed, which agrees with the observed pharmacological and pharmacokinetic data.

Animals↗
PubMed1981

Eradication and palliation of squamous cell carcinoma of the esophagus with chemotherapy, radiotherapy, and surgical therapy.

Between April, 1977, and March, 1981, 86 unselected patients with proved squamous cell carcinoma of the esophagus were treated with a combination of chemotherapy and radiotherapy followed by operation whenever feasible. The preoperative chemotherapeutic agents used initially were 5-fluorouracil, and mitomycin C. After December, 1979, cis-platinum was used instead of mitomycin C. Radiotherapy (3,000 rads) of the tumor was begun at the same time as the chemotherapy. An esophagectomy was performed on suitable candidates 3 to 4 weeks after the chemotherapy and radiotherapy were completed. The mucosal lesion disappeared in 69 of the 86 patients, and dysphagia was relieved at least temporarily in 57 of 62 patients. Recurrent dysphagia resulting from fibrosis at the tumor site caused a secondary stenosis in 11 patients. Excellent palliation was obtained in five patients with bronchoesophageal fistulas who had an initial substernal gastric bypass followed by chemotherapy and radiotherapy. Of the 48 patients who had an esophagectomy, 15 (31%) had no tumor in the resected specimen. Eleven of these 15 patients are still alive with no evidence of disease. All patients with a lesion less than 5.0 cm in length had complete regression of the tumor. We believe that this combination of chemotherapy, radiotherapy, and surgical therapy provides excellent palliation, increases resectability, and has a potential for cure.

Adult↗
PubMed1980

Simultaneous Hodgkin's disease in three siblings with identical HLA-genotype.

We report 3 cases of Hodgkin's disease (HD) within a family of seven children. All three children had mixed cellularity type in different stages of the disease (IV-B, III-A, and II-A). The diagnosis was made within a one-month interval. HLA typing shows an identical genotype in the 3 HD patients, which was different from the rest of the family. One of the patients developed an idiopathic thrombocytopenic purpura (ITP) with temporary response to prednisone and MOPP-C chemotherapy that subsided after splenectomy. The HLA identity, in addition to the simultaneous onset of the HD, suggests a combination of both genetic and environmental factors in the pathogenesis of this disease.

Biopsy↗
PubMed1980

Anti-factor IX circulating anticoagulant and immune thrombocytopenia in a case of Takayasu's arteritis.

A 38-year-old male with proven Takayasu's arteritis presented, in a routine investigation, with thrombocytopenia, prolonged whole blood clotting time and activated partial thromboplastin time. Further studies demonstrated low levels of factor IX caused by a circulating anticoagulant. Immunological studies revealed an IgG (with kappa chains predominance) nature of this. Corticoid therapy decreased but did not suppress the anticoagulant activity. Since similar coagulation abnormalities have been described in collagen diseases, this observation is in support of this etiology to be considered in Takayasu's arteritis.

Adult↗
PubMed1977

Pathologic findings in human scabies.

The histologic findings in the papular, vesicular, nodular, and Norwegian variant of scabies have in common a superficial and deep perivascular mixed inflammatory cell infiltrate of lymphocytes, histiocytes, and numerous eosinophils. A spongiotic vesicle occurs in the papulovesicular type, a dense cellular infiltrate in the nodular type, and a hyperkeratotic psoriasiform dermatitis in the Norwegian type. Eggs, larvae, and adult mites are abundant in the cornified layer of Norwegian scabies, are practically never found in biopsy specimens from lesions of nodular scabies, and are discovered only episodically in papulovesicular lesions.

Blood Cells↗
PubMed1976

[False basalnomas and false cutaneous metastasis of visceral cancer. Apropos of 7 observations of eccrine carcinoma].

After a review of the bibliography on the subject of eccrine sweat gland carcinomas, the authors emphasize the confusing terminology used for the designation of these cases and the difficulties for a correct clinical and histological diagnosis of these tumors. According to the data obtained from the study of 7 personal cases, the most characteristic features of the eccrine carcinomas could be the following: 1) From the clinical standpoint--Appearance of a single tumour, lasting unmodified for a long period of time.--Tendency to reccurrence of the neighbouring areas after tumour excision, and to a slow progression through the superficial lymphatic channels.--Appearance of distant metastasis a long time after the original lesion. These metastases are observed, a) on the regional lymph nodes, b) on the superficial lymphatic channels and c) in some cases in the skin by intraepidermal growth. 2) From the histological point of view--Localisation in the deep dermis of the tumoral masses in the original lesion.--Acinar or tubular structures. Abundant nitoses and considerable indifferntiation of the cellular elements.--Tendency to the formation of empty peritumoral spaces separating the tumoral masses from the connective tissue by the retraction caused by the fixative.--Styloid or trabecular growth surrounding the main mass of the tumor.--Two types of cells can be observed in some tumours; large cells with a clear cytoplasm and small deeply-stained cells resembling the mioepithelial cells.--Tendency to the formation of clear cell tumoral masses.--Squamous metaplasia of isolated cells or groups of cells.--Presence of PAS-positive cytoplasmatic granulations in some cellular elements.--Degenerative changes with secondary cystic formations.--Frequent features of tumoral lymphangitis. 3y From theions.--Frequent features of tumoral lymphangitis. 3) From the cytological standpoint Staining in yellow of the cytoplasms of the tumour cells with the Panpanicolau method. 4) From the ultrastructural standpoint--Impossibility of classifiying the cells into serous or mucous due to the considerable anaplasia.--Absence of eccrine-apocrine differentiation, of ductal formation and of embrionary sweat cell features.

Basal Cell Carcinoma↗