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Query: UMLS:C0027651 (tumor)
 685,946 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The abundant soluble proteins of the eye lens, the crystallins, are encoded by several gene families which are developmentally regulated in the embryonic lens. We have studied the expression of the murine alpha A-crystallin gene. Transfection experiments using the pSVO-CAT vector and explanted lens epithelia from embryonic chickens demonstrated proximal (-88 to -60) and distal (-111 to -85) regulatory sequences which interact when the alpha A-crystallin promoter is activated in the lens cells. Transgenic mouse experiments showed that the sequence between positions -366 to +46 of the alpha A-crystallin promoter can drive foreign genes selectively in the lens. A fusion gene consisting of this alpha A-crystallin promoter sequence and the T-antigen gene of SV40 produced a lens tumor in transgenic mice. Thus, crystallin promoters provide a useful model for tissue-specific gene expression and permit targeting the expression of foreign genes to a highly differentiated tissue during development.
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PMID:Crystallin genes: lens specificity of the murine alpha A-crystallin gene. 369 37

Selection modes for surgery were studied in a group of lung cancer patients. Selection is based: on the certain diagnosis of the disease, its histological classification and stage respiratory function tests and the assessment of any surgical indications. A total of 714 lung cancer cases were examined. Of these, 28.4% were at stage 1, 19.8% at stage 2 and 51.8% at stage 3. Only 141 patients or 19.8% of all cases examined were judged fit for radical exeresis. In the absence of metastasis all three stages of epidermoid carcinomas and adenocarcinomas were judged operable. In the case of microcytomas indication to surgery was limited to very few cases and only those in the first two stages. In the presence of metastasis to the hilar lymph nodes, surgery was only indicated where the metastasis was small. Exeresis was also indicated in the presence of single metastases to mediastinal lymph nodes on the same side as the neoplasia especially if these were considered intranodal. The difficulty of precise assessment of metastases to the hilar and mediastinal lymph nodes even with the aid of modern techniques like CAT scanning and mediastinoscopy was also noted. In 87 of 141 patients operated it was possible to check the result which was radical in 84 cases. In all, 19 pneumonectomies, 49 lobectomies and 16 bilobectomies were performed. The operative mortality rate was 3.4%. The various surgical indications were also examined in relation to the diverse clinical situations presented by lung cancers. In conclusion the modalities to be followed in order to enhance the value of radical resections in lung cancer are outlined. Above all diagnostic means must be refined to a point where the disease can be staged with maximum precision, patients for surgery must be selected with the utmost care and diagnosis must be as early as possible.
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PMID:[Indications for surgical intervention in patients with pulmonary cancer. Observations on 714 cases]. 370 28

Two hundred twenty-eight patients with acoustic neuromas were seen between 1974 and 1985. Twenty-eight received no surgical treatment. Five patients who had undergone previous partial excision were excluded. The mean age was 71 years. The mean expected survival was 14.3 years. The mean follow-up interval was 51 months (range 12 to 120 months). All patients underwent at least two CAT scans (mean = 4). Tumor size ranged from 4 mm to 30 mm. Three patients underwent insertion of ventricular-peritoneal shunt for hydrocephalus (mean 16 months after presentation) and two patients partial tumor removal (mean 30 months after presentation). Tumor growth was measured in each patient using CAT scanning. Monitoring by clinical examination and regular CAT scanning is possible, but in this study 20% of patients required surgical treatment within one third of their expected survival time. This suggests that an expectant attitude for this group of patients may be a debatable form of management.
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PMID:Is no treatment good treatment in the management of acoustic neuromas in the elderly? 373 95

Six patients with malignancies in a solitary kidney were treated with conservative renal parenchymal-sparing surgery utilizing the Neodymium Yttrium Aluminum Garnet (Nd:YAG) laser. Three patients had transitional cell carcinoma in an upper pole calyx of a solitary kidney. The transitional cell carcinoma was treated definitively by the Nd:YAG laser through a nephroscope prior to partial nephrectomy. The 3 patients have been followed up for twenty-eight, eighteen, and six months, respectively. None of the patients has shown evidence of recurrent cancer on follow-up retrograde ureterograms or on urine cytology obtained from the renal pelves. Three patients with renal cell carcinoma in a solitary kidney had the tumor surgically excised utilizing the Nd:YAG laser in conjunction with standard surgical techniques. All the patients were elderly with compromised renal vasculature that prevented bench surgery with autotransplantation or occlusion of the renal artery. At sixteen, fourteen, and three months, respectively, there is no evidence of recurrent cancer on CAT scans obtained on these patients.
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PMID:Renal preservation utilizing neodymium:YAG laser. 375 8

Patients with dumbbell neuroblastoma present with a wide variety of spinal cord problems. We recently treated an infant with a large dumbbell neuroblastoma who was neurologically intact. Because a CAT scan showed a retroperitoneal mass to be abutting the right vertebral body at T12-L1, a precautionary myelogram was performed, which revealed extensive intraspinal extension. We report this case to emphasize the need to have a high index of suspicion of spinal cord involvement in light of a normal neurologic examination since, any attempt at removing the extraspinal part, first, could cause serious neurologic sequelae. We also wish to emphasize avoiding radiation therapy when the tumor has been removed grossly to lessen the development of kyphoscoliatic deformity. The infant will be routinely followed with serial VMAs and ultrasound.
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PMID:Dumbbell neuroblastoma presenting without spinal cord findings. 379 63

Successful management of a patient with an intracardiac tumor thrombus of renal carcinoma is described. This case and a few others in the literature have led us to consider the clinical signs of cavo-atrial obstruction, frequently silent and unspecific; the diagnostic methodology, especially based upon CAT scan and cavography, and the type of surgery and surgical technique called for, especially as regards the approach and the possible use of extracorporeal circulation (ECC).
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PMID:Surgical approach to renal cell carcinoma extending into the right atrium through the inferior vena cava. 405 81

Gamma-linolenic acid has been shown to suppress the rate of proliferation of a number of malignant cell lines in culture. To test the proposal that this was a specific prostaglandin 1- or 2-series effect, 379 batches of MG63 human osteogenic sarcoma cells were seeded in Greiner flasks and cultured in media supplemented with a range of unsaturated fatty acids and prostaglandins. The monounsaturated fatty acid oleic acid enhanced the rate of cancer cell proliferation. The polyunsaturated fatty acids linoleic acid, gamma-linolenic acid, arachidonic acid, alpha-linolenic acid, eicosapentaenoic acid and docosahexaenoic acid, as well as prostaglandins E1 and A1 suppressed the rate of cell proliferation. Total suppression of colony forming and cell proliferation occurred at high levels of polyunsaturated fatty acid supplementation. In addition gamma-linolenic in the form of evening primrose seed oil and vitamin C has been given to 6 patients with histologically diagnosed primary liver cell cancer. Some clinical improvement and reduction in tumor size occurred in 3 cases. One patient has shown remarkable improvement in reduction of liver and tumor size on the CAT scan and reduction of the serum alkaline phosphatase from 2830 to 295 units and gamma-glutamyl transaminase from 274 to 82 units. Thus preliminary clinical results suggest that gamma-linolenic acid may be effective in the management of human cancer patients and further trials should be conducted. However, the cell culture results suggest that although the essential fatty acids suppress proliferation, eicosanoids of all 3 series may be involved. The proliferation suppressive effect of docosahexaenoic acid suggests that other aspects than only eicosanoid activity may also be important in the suppression of cancer cell proliferation.
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PMID:Some effects of the essential fatty acids linoleic acid and alpha-linolenic acid and of their metabolites gamma-linolenic acid, arachidonic acid, eicosapentaenoic acid, docosahexaenoic acid, and of prostaglandins A1 and E1 on the proliferation of human osteogenic sarcoma cells in culture. 608 35

Review of the 55 reported cases of glucagon-producing tumors reveals that a distinctive clinical syndrome consisting of diabetes, a peculiar dermatitis termed necrolytic migratory erythema, weight loss and an increased tendency for thrombosis is associated with these neoplasms. Normochromic normocytic anemia, hypocholesterolemia, hypoproteinemia and generalized hypoaminoacidemia are frequent laboratory findings. Definitive diagnosis of a glucagonoma requires elevation of the fasting serum glucagon level. Selective arteriography of the pancreas has been the best method for localizing these neoplasms preoperatively, but the noninvasive technics of ultrasound and CAT scanning can also be helpful. When the tumor is benign, complete surgical excision can completely reverse all the clinical manifestations of the glucagonoma syndrome and result in lasting cure. Since, however, approximately three-fourths of these tumors are malignant, palliative therapy is frequently required. Cytoreductive surgery can decrease the amount of hormone-producing tissue and can improve or even temporarily reverse the clinical symptomatology. For disseminated disease, chemotherapy is necessary. The best results have been obtained with DTIC although streptozotocin has also been used.
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PMID:Clinical aspects of glucagon-producing islet cell tumors. 627 69

The tumor within the carotid sheath described in this article is unusual in that its clinical presentation mimicked a deep-lobe parotid tumor. Despite extensive investigation with conventional sialography, technetium pertechnetate scintigraphy, and computerized axial tomography, the correct preoperative diagnosis was not established. The value of CAT scanning in the diagnosis of parapharyngeal tumors is demonstrated.
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PMID:Carotid sheath tumor--a diagnostic challenge. 628 48

A 32-year-old woman with a contraceptive history of use of combination contraceptives (Oviston, Non-Ovlon) between 1966 and 1979 (with a 1-year interruption), followed by radical hysterectomy in 1979, complained of dull right upper quadrant pain, nausea, vomiting, and fatigue in 1980. Among various diagnostic studies performed only cholecystography and cholangiography demonstrated clear areas in the gallbladder assumed to be stones. Cholecystectomy performed in 1981 showed chronic inflammation of the gallbladder without stones. The undersurface of the liver revealed a greyish tumor (3 cm in diameter). Frozen section demonstrated mature hepatocellular adenoma. Wedge excision of the tumor and cholecystectomy were performed without complications. CAT-scan follow-up showed no residual pathology. Additional literature search reports 58 cases in western European and American journals. Diagnosis of these benign tumors is difficult because the symptoms are vague. The main complication is intraabdominal hemorrhage necessitating emergency lobectomy. Ligation of a branch of the hepatic artery is done in case of inoperability. CAT-scan and ultrasonography with selective angiography are the best procedures to ascertain the diagnosis. Needle biopsy is contraindicated because of the risk of hemorrhage.
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PMID:[Hepatocellular adenoma following long-term intake of ovulation inhibitors]. 630 51


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