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

Gliomas, derived from astrocytes, oligodendroglia, or ependyma, are each united into a continuum by a graduation of anaplasia. Neoplasms originate at all levels of each continuum; subsequently, some move along its declivity. Conversely, neuroblastic tumors may differentiate, whereas concomitantly in the same lesion, the glial stroma may dedifferentiate. Anaplastic glia, as in a glioblastoma multiforme, can initiate malignant transformation in alien cells.
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PMID:Nomenclature for gliomas. 20 38

Various modes of therapy, alone or in combination, have had little effect in improving the survival of patients with glioblastoma multiforme. Recently, in a pilot study, 34 patients with glioblastoma were treated by fast-neutron-beam irradiation of the whole brain. Following treatment, the patients became steroid-dependent and pursued a gradual downhill course with increasing obtundation. Although there was no improvement in the length or quality of survival of these patients, neuropathological studies in the 13 patients who came to autopsy showed the following: 1) extensive coagulative necrosis of much of the tumor mass; 2) dense infiltration by collagenous connective tissue; 3) minimal phagocytic reaction; 4) marked reduction in the amount of viable tumor; 5) abnormal astrocytic proliferation, which may represent either astrocytoma or a radiation-induced bizarre gliosis, and 6) areas of gliosis and white matter degeneration in the brain stem, remote form the tumor site. These observations suggest that continued efforts to further refine this mode of therapy for glioblastoma are warranted.
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PMID:Fast-neutron irradiation of glioblastoma multiforme. Neuropathological analysis. 20 33

Owl monkeys were inoculated intracerebrally, subcutaneously, and intravenously with JC, BK, or SV40 virus. Two of four adult owl monkeys inoculated with JC virus, a human polyomavirus, developed brain tumors at 16 and 25 months after inoculation, respectively. A grade 3 to grade 4 astrocytoma (resembling a human glioblastoma multiforme) was found in the left cerebral hemisphere and brainstem of one monkey. The second monkey developed a malignant tumor in the left cerebral hemisphere containing both glial and neuronal cell types. Impression smears prepared from unfixed tissue of this tumor showed cells that contained polyomavirus T antigen. Virion antigens were not detected. Tumor cells cultured in vitro also contained T antigen but were negative for virion antigen. Infectious virus was not isolated from extracts of this tumor.
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PMID:Brain tumors in owl monkeys inoculated with a human polyomavirus (JC virus). 21 83

Supervolt radiation therapy produced no improved survival rates in the treatment of glioblastoma multiforme as compared to orthovolt therapy. Survival times of more than one year or two years must still be considered a rarity. The application of computer techniques to the calculation of dose distributions greatly enhances the optimization of treatment planning. Tumour doses of 5,000 to 7,000 rad are considered necessary, and are dangerously close to the dose levels tolerated by brain tissue. Improvements could conceivably be expected from a) combinations of chemotherapy and radiation therapy, b) intra-arterial application of radiating substances with tumour affinity, c) neutron therapy. Whether or not such measures will in the future produce improved therapeutic results remains to be seen.
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PMID:Megavoltage therapy of glioblastoma multiforme. 21 10

The first two instances of mixed sarcoma-glioblastoma with a history of therapeutic irradiation to the head are reported, both occurring within one year of radiation therapy (for pituitary adenoma and residual meningioma). Two novel variants of mixed sarcomas of brain with extreme tumor metaplasia (fibromyxoosteochondrosarcoma and fibrochondroosteosarcoma-glioblastoma multiforme) are documented, and some of the problems concerning the origin of brain tumors with mixed population are discussed.
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PMID:Mixed intracranial sarcomas: rare forms and a new association with previous radiation therapy. 21 26

From March 1974 to December 1976, 56 patients with glioblastoma multiforme had precraniotomy computed tomography (CT) scans from which the lesion size was determined by measuring the cross-sectional area. Thirty-two patients underwent surgery followed by irradiation, and 24 had surgery followed by irradiation and chemotherapy. There was no difference in survival between the 16 patients with small lesions and the 16 patients with large lesions in the surgery plus radiation alone group, nor in the 16 patients with small and 8 patients with large lesions in the surgery, radiation and chemotherapy group. Minimum follow-up was one year. Other possible prognostic factors including age, tumor grade, radiation dose, and performance status were comparable for each subgroup. Lesion size in glioblastoma multiforme appears unrelated to prognosis.
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PMID:Prognostic significance of lesion size for glioblastoma multiforme. 22 97

A three-dimensional reconstruction and display technique (THREAD SYSTEM) for serial computed tomography (CT) was employed in monitoring tumor volumes in two children under chemotherapy for glioblastoma multiforme of the cerebral hemispheres. Progressive diminution of tumor bulk was documented in the first patient and an increase in volume in the second. The first patient expired of the complications of his therapy and the second of transtentorial herniation. Independent measurements of the tumors as determined by a CT scan near the times of death and tumor dimensions measured at autopsy revealed good correlations between the radiographic and the anatomical data. The final CT measurement of tumor volume of 20 cm3 compared with an autopsy calculation of 13.3 cm3 in the first case. In the second case, CT volume was 417 cm3 and the actual volume of the primary tumor mass at autopsy was 437 cm3. The results suggest that the THREAD system is a practical method for monitoring the results of radiotherapy and chemotherapy in certain types of cerebral neoplasms.
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PMID:Correlation between volumetric CT imaging and autopsy measurements of glioblastoma size. 22 7

Papovaviruses can induce experimental brain neoplasms in animals, and some papovaviruses have been implicated in the formation of various human tumors. We examined a series of seven human brain tumors removed at craniotomy for the presence of viral DNA sequences by the technique of DNA-DNA hybridization. Simian virus 40 (SV40) DNA was labeled in vitro and used as a "probe" for detecting related DNA sequences in cellular DNA extracted from brain tumors. SV40-related DNA sequences were found in DNA extracted from one tumor, a glioblastoma multiforme. It was calculated that approximately 1.2 viral genome equivalents per diploid cell were present in the tumor. Since the rate of reassociation of the probe deviated from ideal second-order kinetics, it is surmised that either only a portion of the SV40 genome was present in tumor cells or, alternatively, that the probe detected a related human papovavirus.
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PMID:Simian virus 40-related DNA sequences in a human brain tumor. 22 17

From September, 1972 to December, 1976, 102 consecutive patients operated on for glioblastoma multiforme were randomized, after total or subtotal tumor resection, to receive irradiation alone, irradiation plus BCNU or irradiation plus CCNU. BCNU and CCNU adjuvant chemotherapy was repeated every 6--8 weeks as long as the patients remained in complete remission. Patients were comparable for median age, type of surgery, and histological grade III and IV. Radiotherapy was administered at the tumor dose of about 5000 rads in all three groups. The percent of optimal dose administered was 96% for BCNU and 93% for CCNU. In the group treated with radiotherapy alone (32 cases) the median survival was 10.5 months, while in the groups treated with BCNU (34 cases) and CCNU (36 cases) the median survival was 12 and 16 months, respectively. Both relapse-free (P = 0.05) and total survival (P = 0.03) were significantly improved only in patients who were treated with radiotherapy plus CCNU compared to patients receiving radiotherapy alone after surgery. Present results show that in resectable glioblastoma multiforme, a slightly improved survival rate can be achieved by the prolonged use of adjuvant CCNU following maximal surgical resection and radiotherapy. The cure rate was not improved.
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PMID:Controlled study with BCNU vs. CCNU as adjuvant chemotherapy following surgery plus radiotherapy for glioblastoma multiforme. 22 83

26 patients, average age of 7.3 years, has biopsies of a brain stem tumor. 62% of the patients presented with hydrocephalus, and ventriculoperitoneal shunts were placed 7-10 days prior to biopsy. The midbrain was biopsied 13 times, the pons 3 and the medulla 12 times. Tissue for histopathologic examination was obtained at each operation and demonstrated astrocytoma in 13 patients, glioblastoma in 6, 'no tumor seen' in 5 and ependymoma in 2. Astrocytomas were usually located in the upper brain stem, and all of the glioblastomas were located in the medulla. The operative mortality was zero, and the morbidity was largely related to increased cranial nerve deficit. All the astrocytoma patients were treated with radiation only; whereas, 4 patients with glioblastoma were treated with vincristine, CCNU and methylprednisone in addition to radiation as described by the Children's Cancer Study Group (CCG-944). 3 patients with 'no tumor' were not treated and are alive and well 15-41 months following operation. 2 patients with no tumor were treated, one as a glioblastoma multiforme, subsequently verified at postmortem examination, and one as a midbrain astrocytoma. 1 patient with astrocytoma died 3 months following operation, all the remainder are living and well 4-51 months following operation. Irrespective of the treatment, all 7 patients with glioblastoma expired within 9 months of diagnosis. The prognosis for survival for patients with brain stem astrocytoma is superior to those with glioblastoma multiforme. Specific histopathologic correlation with clinical management may lead to improved and prolonged survival for patients with brain stem glioma.
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PMID:Biopsy of pediatric brain stem tumors. 45 7


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