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

The carcinogenicity of sodium nitrite and methylguanidine singly and together were examined in rats. A hepatocellular carcinoma, a hemangiosarcoma and a spindle cell sarcoma were found in 3 of 15 rats fed continuously on pellet diet containing 0.16% sodium nitrite and 0.16% methylguanidine. Hemangiomas and bile duct adenomas of the liver were also found in 6 and 8, respectively, of the 15 rats in this group. Hemangiomas and bile ducts adenomas of the liver were found in 2 and 3, respectively, of the 4 rats fed on pellet diet containing 0.16% sodium nitrite. Only 1 of 5 rats fed on pellet diet containing 0.16% methylguanidine developed a hemangioma. No tumor was found in the control group. All the tumors were found in rats that survived for over 12 months. No significant changes were detected in the esophagus or stomach.
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PMID:Induction of liver tumors in rats by sodium nitrite and methylguanidine. 20 1

A 76 year-old woman suffered from the simultaneous occurrence of a malignant metastazising tumor of the thyreoid and a colonic cancer without metastases. The thyreoid tumor was composed of epithelial and mesenchymal elements, among them a malignant angiosarcoma. Both elements were found not only in the primary tumor but also in the metastases.
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PMID:[Epithelial-mesenchymal tumor of the thyreoid associated with a colonic cancer (author's transl)]. 20 46

BK virus (BKV), a human papovavirus, was inoculated iv into 3-week-old Syrian golden hamsters. Between 2 1/2 and 9 months after inoculation, 82% of the animals developed tumors. The induced neoplasms were ependymoma, carcinoma of the pancreatic islets, osteosarcoma, adenocarcinoma, angiosarcoma, angioma, lymphoma, and seminoma. Hypersecretion of insulin, glucagon, C-peptide, and calcitonin was detected in tumors of pancreatic islets. BKV etiology of tumors was supported by the following evidence: 1) No tumors with BKV-specific markers appeared in animals given injections of buffer, animals inoculated with BKV neutralized by anti-BKV-specific serum, or uninoculated controls; 2) BKV tumor (T) antigen was detected by immunofluorescence and complement fixation tests in tumors of animals inoculated with infectious BKV and in transplanted tumors; 3) antibodies to BKV T-antigen were detected in sera of animals bearing primary or transplanted tumors; 4) BKV could be activated by Sendai virus-mediated fusion of neoplastic cells with susceptible Vero cells; and 5) no endogenous hamster oncornaviruses were found in tumors.
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PMID:Ependymomas, malignant tumors of pancreatic islets, and osteosarcomas induced in hamsters by BK virus, a human papovavirus. 21 Dec 43

This report deals with a 51 years-old man who, for 23 years and 4 months of his working life, had been exposed to vinyl chloride vapors. Autopsy revealed a hepatoma associated with an angiosarcoma of the liver. The case is the first ever to be reported in the medical literature. This case raises doubts about the theory which suggests that the carcinogenic effect of vinyl chloride in man elicit a tumor of vascular nature.
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PMID:[Association of angiosarcoma of the liver and hepatoma in vinyl chloride worker]. 21 80

The present study consists of 651 cases of soft tissue tumors originating in the head and neck area. Among these tumors 628 were benign (96%), while there were only 23 malignant cases (4%). In the benign group hemangiomas showed the highest incidence (47%) followed by tumors of adipose tissue (19%) and those of peripheral nerves (12%). Rare tumors consisted of nodular fascitis, hibernoma, lipoblastomatosis, glomus tumor, granular cell tumor, and chondroma. The majority of cases in the malignant group were either those of muscle origin or blood vessel origin. Excepting for two cases of rhabdomyosarcoma of the embryonal type and two cases of angiosarcoma, all showed recurrence and/or metastasis and terminated in death. Three cases of liposarcoma of either well-differentiated or myxoid type had a good prognosis with all three living for 3 or more years without any recurrence. Other malignant tumors consisted of malignant schwannoma, fibrosarcoma, malignant fibrous histiocytoma, alveolar soft part sarcoma, and chordoma. The age, sex, anatomical location, and differential diagnosis have also been described.
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PMID:A clinicopathological study on soft tissue tumors of the head and neck. 22 15

Knowledge of the cellular changes that lead to hepatic neoplasia in humans is limited. Cirrhosis is a common antecedent or accompaniment of liver cell carcinoma and it seems that both its etiology and its time of duration are relevant risk factors. Many cellular changes have been observed in patients and among populations considered to be at risk. Of these, liver cell dysplasia is the most striking, and studies of its prevalence, natural history, and association with particular forms of cirrhosis suggest that it is a precancerous change. Bile duct carcinoma may follow infestation with liver flukes and duct epithelial hyperplasia is present before the development of cancer. Angiosarcoma from several causes is commonly preceded by a peculiar fibrosis, vascular changes, and Kupffer cell hyperplasia.
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PMID:Precancerous changes in the human liver. 22

Undiluted, fivefold-diluted, and 25-fold-diluted doses of a stock of Moloney murine sarcoma virus were injected directly, in a volume of 0.025 ml, into the backs of fetal Sprague-Dawley rats by laparotomy through the uterine wall at 18 days of gestation. During the first 8 weeks after birth the young responded to the virus with remarkably high but dose-dependent incidences of neoplasms. When a one-fifth dilution of the virus preparation was inoculated at fetal ages 16, 18, and 20 days, the incidences of lesions decreased with advancing fetal age. The tumors developed preferentially at the virus inoculation site and/or in the proximal parts of the extremeties; all were considered to be of mesenchymal derivation, i.e., malignant mesenchymoma, rhabdomyosarcoma, osteosarcoma, fibrosarcoma or fibromyxosarcoma, hemangiosarcoma, plasmacytoma, and a giant cell tumor. This injection procedure provided us with a valuable experimental tool for the rapid screening or testing of potential chemical carcinogens and other biologic studies.
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PMID:Enhancement of tumor induction in rats with Moloney murine sarcoma virus by a "new" method based on direct injection into fetuses. 26 91

An unusual case of primary angiosarcoma of the left atrium in a heart with chronic rheumatic valvulitis is described. The tumor which was detected at autopsy 2 years after the second valvotomy operation was restricted to the endocardium only and metastasized to the brain.
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PMID:Primary angiosarcoma of the heart. 31 60

Four cases of hepatic angiosarcoma are reported with a review of 99 other cases in the English literature. Angiosarcoma of the liver is associated with chronic exposure to thorotrast, vinyl chloride, arsenicals, radium and possibly copper and with chronic idiopathic hemochromatosis. Although 40% of patients have hepatic fibrosis or cirrhosis at autopsy, the nature of the association between chronic liver disease and hepatic angiosarcoma is unknown. The clinical presentation of hepatic angiosarcoma is nonspecific with abdominal pain, weakness and weight loss common complaints and with hepatomegaly, ascites and jaundice common findings. Liver function tests are usually abnormal but there is no one liver function test or set of tests specific for the tumor. The occurrence of thrombocytopenia and disseminated intravascular coagulation is characteristic of hepatic angiosarcoma and may be related to local consumption of clotting factors and formed blood elements in the tumor. Catastrophic intraabdominal bleeding is also characteristic and occurs in one-fourth of all cases. This complication is likely related to the high incidence of clotting abnormalities and the vascular nature of the neoplasm. Selective hepatic arteriogram and open liver biopsy are the foundations of diagnostic evaluation. Percutaneous liver biopsy should be avoided. Failure to appreciate the possibility of hepatic angiosarcoma in the proper clinical setting, leading to blind percutaneous biopsy, may result in failure to make the diagnosis at the cost of significant morbidity and mortality. Survival of patients with hepatic angiosarcoma is brief; only 3% live longer than 2 years. Treatment of the tumor to date is empirical. There are probably a few patients who might benefit from radical surgery with curative intent. For all others chemotherapy is indicated. Adriamycin is active against hepatic angiosarcoma, but optimal dose and mode of administration require further investigation. Further study is also required to delineate the cause of hepatic angiosarcoma in the 60% of cases without definite epidemiologic association.
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PMID:The clinical features of hepatic angiosarcoma: a report of four cases and a review of the English literature. 36 8

Lymphangiosarcomas were found in 5 out of 82 observations of vascular malignant tumours in children, according to the data of the pathological department of Children's Clinical Hospital No. 1, for 60 years. Differential diagnosis of relapsing lymphangiomas and rarely found malignant lymphangioendetheliomas presents considerable difficulties for morphologists because of poorly manifest cell polymorphism in the primary node of neoplasia and the presence of areas of lymphangioma and malignant hemangioendothelioma among fields of lymphangiosarcoma. Cytological studies assist in specification of the degree of malignancy and histologenesis of the neoplasias.
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PMID:[Malignant tumors of lymphatic vessels in children]. 42 36


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