Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UMLS:C0677930 (primary tumor)
 20,210 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

By flow microfluorometry the DNA distribution curve of the cell nuclei of 39 adnex tumors, mainly ovarian carcinomas, was measured. 47% of the malignant tumor cell populations were diploid, the other ones were heteroploid (i.e. polyploid, tetraploid, aneuploid stem lines). Heteroploid tumors had the worse prognosis. In 8 cases effusions were analysed (7 ascites, 1 pleura). It is possible to diagnose a malignant tumor from effussion fluid by impulse cytophotometry. But in one case a great difference was found between the primary tumor and the ascites fluid, which only shows the DNA distribution of an irritative effusion. The value of impulse cytophotometry for clinical purposes is discussed.
 ...
PMID:[Flow fluorescence-photometry in ovarian carcinomas with and without effusion]. 13 8

We have used restriction endonucleases which cleave the DNA of mouse mammary tumor virus (MMTV) at one site (Eco RI) and several sites (Pst I, Sac I and Bam HI) to study infection and mammary tumorigenesis in mice. Proviruses acquired during infection of BALB/c mice foster-nursed by virus-producing C3H females can be distinguished from the MMTV proviruses endogenous to uninfected BALB/c mice by the nature of the fragments generated with Pst I and Bam HI. Using this assay, we show that lactating mammary glands as well as mammary tumors from BALB/cfC3H mice have acquired MMTV DNA, and that a minimum of approximately 10% of normal glandular cells can be infected. The new proviruses appear to be linked to cellular DNA of mammary tumors and infected lactating mammary glands within a limited region (0.2 x 10(6) daltons) of the viral DNA; the location of this region, based upon mapping studies with unintegrated MMTV DNA, suggests that the orientation of these proviruses is colinear with linear DNA synthesized in infected cells and thus approximately colinear with the viral RNA. Comparisons of many mammary tumors and studies of lactating mammary glands with a high proportion of independently infected cells indicate that a large number of sites in the cellular genome can accommodate a new provirus; the acquired proviruses are rarely, if ever, found in tandem with each other or with endogenous proviruses. We cannot, however, distinguish between random integration and integration into a large number of preferred sites in the host genome. Since Eco RI and Bam HI cleavage of DNA from each mammary tumor generates a unique set of viral-specific fragments, we propose that the tumors are composed principally of cells derived from a subset of the many infected cells in a mammary gland; this proposal is supported by our finding that Eco RI digestion of DNA from several transplants of a primary tumor yields the pattern characteristic of the primary tumor.
 ...
PMID:Integration of the DNA of mouse mammary tumor virus in virus-infected normal and neoplastic tissue of the mouse. 22 56

The genetic basis of retinoblastoma is reviewed and the following conclusions are drawn: 1) The mode of inheritance of the hereditary variety of retinoblastoma (R) is autosomal dominant with about 90% penetrance. 2) About 68% of inherited cases are bilateral, and about 32%, unilateral. There is an intrafamilial correlation between penetrance as measured by segregation ratio and expressivity as measured by the fraction of bilaterally affected patients. 3) The vast majority of all R patients are sporadic cases, i.e., they are the only affected members of otherwise unaffected families. The porportion of bilateral cases is much lower among sporadic than among hereditary cases. 4) All bilaterally affected patients with sporadic R and patients with unilateral sporadic R with more than one primary tumor have to be regarded as germ cell mutants; they will transmit the gene to 50% of their offspring. Only 10%-12% of unilateral sporadic cases are germ cell mutants; 88%-90% are nonhereditary; in these cases the tumor is probably caused by a somatic mutation. 5) In a minority of cases, deletion of the chromosome segment 13q14(=intersitital deletion of the long arm of chromosome 13) has been observed. In addition to R, the patients show a variable degree of general or mental retardation; often there are few external indications of a chromosome aberration. Other chromosome studies suggest anomalies of chromosome 13 in tumor tissue even in cases not showing an anomaly of this chromosome in blood cultures, and possibly a slightly increased chromosome instability. 6) Patients with bilateral, and possibly in general with hereditary, R run an increased risk of becoming affected with other tumor diseases, such as osseous sarcomas, in later life. 7) Knudson's hypothesis of two mutational steps leading to both the hereditary and the nonhereditary variants of R is discussed critically, and the alternative possibility is suggested that in the nonhereditary variant a single mutational step--possibly a small chromosome aberration--could be enough to produce a tumor. 8) Evidence indicating a possible viral origin of R is cited, and animal experiments are mentioned in which R-like tumors have successfully been produced by local DNA virus inoculation. 9) As a consequence of improved survival and reproduction of R patients, an increased in the incidence of R and in the proportion of bilateral cases among all R patients must be anticipated. 10) Detailed rules for genetic counseling in families affected by R are given.
 ...
PMID:Genetics of retinoblastoma. 39 14

Experimental tumors developed in white Pekin ducks after intramuscular implantation of 20-methylcholanthrene. Cells derived from the primary tumor were adapted successfully to grow in vitro and have growth characteristics similar to that of established cell lines of mammalian origin. The cell density rises rapidly and the doubling time is approximately 17 hr. The duck cells have been cultured successfully for at least 80 passages in votro. The continuously cultured cells have the characteristic chromosome pattern of duck, and the DNA of the duck cell line hybridized with duck liver DNA. We believe we have established a continuous cell line of avian origin. Electron-microscopic examinations of the tumor cells and RNA-directed DNA polymerase of the cell-free supernate show no evidence of endogenous virus production.
 ...
PMID:Establishment of duck cell line derived from experimental tumor induced by 20-methylcholanthrene. 56 48

Cannabinoids represent a novel class of drugs active in increasing the life span mice carrying Lewis lung tumors and decreasing primary tumor size. In the present studies, the effects of delta9-THC, delta8-THC, and cannabidiol on tumor macromolecular biosynthesis were studied. These drugs inhibit thymidine-3H incorporation into DNA acutely, but did not inhibit leucine uptake into tumor protein. At 24 h after treatment, cannabinoids did not inhibit thymidine-3H incorporation into DNA, leucine-3H uptake into protein or cytidine-3H into RNA.
 ...
PMID:In vivo effects of cannabinoids on macromolecular biosynthesis in Lewis lung carcinomas. 61 22

Two dimethyltriazenoimidazoles, DTIC and BRL 51308, and a benzenoid dimethyltriazene, CB 10286, have been examined for their effects in mice bearing Lewis lung carcinoma. A slight reduction of primary tumor growth was found after treatment with DTIC and BRL 51308, whereas CB 10286 caused no significant effect. On the contrary, all the tested compounds sharply reduced the number of lung metastases and also resulted in a high proportion of animals free of metastases at death. No significant cytotoxic effect of the triazenes was observed in small established pulmonary tumors, as determined by evaluating the effects of treatment on the fractional incorporation of 3H-TdR into DNA of the lung colonies. These results are in contrast to those obtained with a purely cytotoxic agent, cyclophosphamide, and indicate that all three triazene derivatives tested have selective antimetastatic properties.
 ...
PMID:Antimetastatic action of some triazene derivatives against the Lewis lung carcinoma in mice. 65 57

Pyran copolymer (NSC 46015) therapy markedly enhanced host resistance to a murine lung carcinoma (M109) implanted s.c. Multiple dose schedules were not significantly better than single doses at increasing lifespan. Although tumor necrosis was much more extensive in the lesions of pyran-treated mice, pyran copolymer was not directly toxic to M109 cells in vitro. A comparative histopathological study revealed an intense histiocytic reaction in the connective tissue surrounding the primary tumor in mice receiving pyran as compared to 0.9% NaCl solution-treated controls. Macrophages were often associated with necrobiotic tumor cells. Morphologically activated macrophages were recovered from pyran-treated animals which potently inhibited DNA synthesis of M109 tumor cells in vitro. This response peaked 6 days after drug treatment and was to a large extent specific for neoplastic cells. Our results from both in vivo and in vitro studies support the concept that pyran enhances host resistance to neoplasia by mobilization and activation of the reticuloendothelial elements of the host's defense.
 ...
PMID:Macrophage involvement in the protective effect of pyran copolymer against the Madison lung carcinoma (M109). 83 62

A radioimmunoassay for ng quantities of DNA was developed. [125l]lododeoxyuridine-labeled DNA was used as the antigen, and the serum of a lupus erythematosus patient served as the source of antibody. The level of free DNA in the serum of 173 patients with various types of cancer and in 55 healthy individuals was determined by this radioimmunoassay. DNA concentration in the normal controls had a range of 0 to 100 ng/ml with a mean of 13 +/- 3 ng/ml (S.E.). For comparison purposes, the range of 0 to 50 ng/ml was designated as normal, and 93% of controls were found in this range. In the cancer patients, the DNA concentration ranged from zero to mug levels with a mean of 180 +/- 38 ng/ml. Fifty % of the patients values were found in the range of 0 to 50 ng/ml; the other 50% were between 50 and 5000 ng/ml. No correlation could be seen between DNA levels and the size or location of the primary tumor. Significantly higher DNA levels, however, were found in the serum of patients with metastatic disease (mean of 209 +/- 39 ng/ml), as compared to nonmetastatic patients (mean 100 +/- 30, p less than 0.02). After radiation therapy in lymphoma, lung, ovary, uterus, and cervical tumors, the levels decreased in 66 to 90% of the patients, whereas in glioma, breast, colon, and rectal tumors, the DNA levels decreased only in 16 to 33% of the patients. Generally, the decrease in DNA concene of tumor size and reduction of pain. Conversely, when DNA levels either increased or remained unchanged, a lack of response to the treatment was noted. Of 17 patients who died within a year, 13 showed DNA levels that remained high or unchanged, whereas only 4 showed lower levels during treatment. Persistent high or increasing DNA levels in the circulation, therefore, may signal a relapse and are probably a poor prognostic sign. The relatively high percentage (50%) of cancer patients with apparently normal DNA levels would suggest that this test may have low diagnostic value. It should be pointed out, however, that all these patients represent a selected group considered for radiation therapy, usually after surgery and/or chemotherapy. It is possible that a better correlation between DNA levels and cancer will be obtained prior to the initiation of treatment. On the other hand, DNA in the serum may be an important tool for the evaluation of therapy or the comparison of different regimens.
 ...
PMID:Free DNA in the serum of cancer patients and the effect of therapy. 83 66

The Madison 109 (M109) tumor was discovered in 1964 in the lung of a BALB/c mouse. This experimental carcinoma is maintained in vivo by sc passage in the right axillary region. When implanted im (5 X 10(5) cells) into the right hind leg of BALB/c mice for testing, the primary progresses with metastases to the lung, spleen, and liver. The metastases to the lung are visible within 3 weeks and result in the death of the host in about 35 days after tumor implant. Implantation of a lung nodule is tumorigenic and lethal. Pyran polymer therapy delayed the appearance of lung metastases, inhibited the growth of the primary tumor, and significantly increased the lifespan of BALB/c mice inoculated with the M109 tumor. No spontaneous regression has been observed and very few "no takes" have occurred in untreated BALB/c mice inoculated with at least 500 M109 cells. Of the 82 agents tested so far, the M109 model has selected active agents such as actinomycin D, adriamycin, daunorubicin, DNA, procarbazine, and pyran polymer. It has not shown sensitivity as tested to several standard therapeutic agents including cytosine arabinoside, BCNU, hydroxyurea, mechlorethamine, melphalan, triethylenemelamine, and vincristine.
 ...
PMID:Characterization and responsiveness of the Madison 109 lung carcinoma to various antitumor agents. 92 51

The presence of epidermal growth factor receptor (EGF-R) gene was determined in 84 patients with squamous cell carcinoma (SCC) of the oropharyngeal region--a highly prevalent, chewing-tobacco associated malignancy in India, using Southern hybridisation analysis of DNA extracted from primary tumor tissues. We observed a 3- to 8-fold amplification of EGF-R gene in 19/66 (29%) of the SCCs of the oral cavity, and about 30-fold EGF-R amplification in 2/18 (11%) hypopharyngeal cancers. Dot blot analysis of total RNA from several tumour tissues, revealed overexpression of the EGF-R gene in the examined patients, with the EGF-R gene amplified. 4 patients with single copy EGF-R gene, did not exhibit overexpression of the gene. Within our sample set, no correlation was evident between EGF-R gene amplification and clinico-pathological parameters of the malignancy. The amplification and overexpression of the EGF-R gene observed in the primary tumour tissues of 25% (21/84) of the human oropharyngeal cancers, indicate possible involvement of the gene in the pathogenesis of these cancers.
 ...
PMID:Amplification and overexpression of epidermal growth factor receptor gene in human oropharyngeal cancer. 130 31


1 2 3 4 5 6 7 8 9 10 Next >>