Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UMLS:C0027651 (tumor)
 685,946 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The effects of a single application of various dose levels of acetic acid or the weak tumor promoter, phorbol-12,13-ditetradecanoate, on the incorporation of tritiated thymidine (3H-TDR), 3H-cytidine, and 3H-leucine into DNA, RNA, and protein of mouse epidermis, respectively, were determined and compared with histologic changes in the skin. Treatment with either 500 or 833 mumoles acetic acid induced a sequential and sustained stimulation of RNA, protein, and DNA synthesis, which was followed by extensive epidermal hyperplasia similar to that reported for the strong promoter and irritant, 12-O-tetradecanoyl-phorbol-13-acetate. A dose-response relationship between the amount of acetic acid and the rate of DNA synthesis was found between the dose levels of 33 to 833 mumoles of acetic acid per application. The latter dose induced the maximum activation of 3H-TDR into DNA at 723% of control at 2 days, whereas 33 mumoles stimulated DNA synthesis earlier and peaked at 210% of control at 3 hours. Phorbol-12,13-ditetradecanoate also stimulated macromolecular synthesis in a similar sequence, though to a lesser degree. No observable inflammation and only a slight hyperplastic response were noted with phorbol-12,13-ditetradecanoate. Weekly applications of 667 mumoles of acetic acid produced a maximal tumor response of 0.73 papilloma/mouse after 32 weeks of promotion. However, a weekly dose of 677 mumoles of acetic acid was essentially inactive when given in two divided doses. When croton oil was administered twice weekly at a 0.25%-dose level, 10.2 papillomas/mouse were induced after 32 weeks of promotion. The results showed that the previously considered nonpromoting inflammatory agent, acetic acid, must be a weak promoter. However, there was no correlation between stimulated macromolecular synthesis or hyperplasia and tumor promotion when phorbol esters were compared with acetic acid.
 ...
PMID:Acetic acid, a potent stimulator of mouse epidermal macromolecular synthesis and hyperplasia but with weak tumor-promoting ability. 118 13

A case of rectal carcinoid tumor with liver metastases is reported in which a markedly elevated serum acid phosphatase level was found. Tissue assays of the patient's tumor, liver metastasis, and uninvolved liver were performed which demonstrated very high tumor levels of acid phosphatase. The patient also had elevated plasma serotonin levels and urinary 5-hydroxyindole acetic acid levels and did not exhibit the carcinoid syndrome. Autopsy showed no prostate cancer or metastatic bone lesions. Serum acid phosphatase elevation may occur with carcinoid lesions of the rectum.
 ...
PMID:Elevated serum acid phosphatase levels with rectal carcinoid tumor. 124 71

A number of tricyclic and bicyclic fused thiazole-2-acetic acid derivatives were prepared and the chemistry and biological properties of these compounds are discussed. Many of the esters exhibited antitubercular activity. The bicyclic thiazole-2-acetic acids had antidepressant activity. Interesting antimetastatic activity against Lewis lung tumor in mice was found with several compounds, in particular, the thiazolo[3,2-a]benzimidazole-2-acetic acid derivative XI.
 ...
PMID:Syntheses of heterocylic fused thiazole acetic acids. 2. 126 4

We studied the influence of five cell nucleus populations taken as diploid standards with respect to the normalization of a human breast carcinoma. Four normal human tissues (lymphocytes, thyroid, liver, and bladder specimens) were taken as external standards, while the normal breast cells "contaminating" the tumor were taken as the internal diploid standard. Nuclear size and nuclear DNA assessments were performed by means of a cell image processor computing the parameters on Feulgen-stained nuclei from fresh imprint smears fixed in an ethanol-formalin-acetic acid mixture. Our results demonstrate that the choice of normal tissue as the diploid standard markedly influences the ploidy level of breast carcinoma. Normalization according to the lymphocytes led to our obtaining a major hyposextaploid G0-G1 DNA peak in the breast cancer. Using thyroid and liver cells as a standard, we obtained a major pentaploid and sextaploid G0-G1 peak, respectively. Using bladder cells or the normal contaminating breast cells within the tumor, we obtained a major tetraploid G0-G1 peak. Finally, the normalization of the normal bladder cells against the liver cells led to our obtaining a near triploid bladder specimen. The reverse feature was also observed, e.g., the obtaining of biologically nonsensical hypodiploid liver cells after normalization against the normal bladder cells. Such postnormalization variations in ploidy level depend upon the mean nuclear size and the mean nuclear DNA content of the normal tissue taken as diploid standard.(ABSTRACT TRUNCATED AT 250 WORDS)
 ...
PMID:Modification of tumor ploidy level via the choice of tissue taken as diploid reference in the digital cell image analysis of Feulgen-stained nuclei. 128 44

This study was based on 2,400 genital examinations performed by means of the acetic acid test looking for human papillomavirus (HPV) lesions in the male partners of women with HPV genital lesions. These peniscopies demonstrated HPV lesions in 56% of the men examined. In 109 cases, histological and virological examination revealed that 30% of them had areas of intraepithelial neoplasia of the penis, associated with potentially oncogenic papillomavirus infection. The value of this examination is to detect HPV lesions and, in particular, dysplastic lesions. The treatment of these lesions appears to allow a reduction in the incidence of recurrence of HPV lesions in women after treatment.
 ...
PMID:[Male genital examination: the usefulness of penis endoscopy and the acetic acid test for the detection of papillomavirus lesions]. 131 66

The colposcopic criteria for abnormal epithelium are leukoplakia, a white area detected after the application of acetic acid or iodine-negative areas not reacting to the acetic acid test. However, white epithelium and iodine-negative areas are not specific for abnormal tissue, condyloma or intraepithelial neoplasia. The lack of specificity of colposcopic findings has motivated the distinction between minor and major grade abnormalities in the recently proposed new colposcopic terminology. Metaplasia and dysplasia cannot be distinguished by colposcopy. All criteria proposed so far lack specificity and reproducibility. Thus, it is at present considered that colposcopy is not a diagnostic method, but an investigative technique that allows the evaluation of the extent of the lesion and localization of the squamo-columnar junction. As for the distinction between condyloma and high-grade intraepithelial neoplasia, all criteria proposed so far also lack reproducibility. Moreover, condyloma is often found at the periphery of high-grade CIN, rendering such a distinction meaningless. The only features specific of HPV infection without dysplasia are condyloma acuminatum and, to a lesser extent, non-acetowhite microcapillary surfaces. Finally, it has been shown that there is no colposcopic sign specific of HPV types.
 ...
PMID:Colposcopic diagnosis of HPV cervical lesions. 133 Sep 18

Screening of the asymptomatic male partners of women with genital condyloma or intraepithelial neoplasia has shown that about 50% of the individuals examined present genital HPV-associated lesions. Half to two thirds of these lesions are clinically invisible and are detected only after the acetic acid test. Histological studies have shown that 20% of male partners of women with high-grade intraepithelial neoplasia present lesions histologically defined as high-grade intraepithelial neoplasia. Couples in which both partners present lesions of intraepithelial neoplasia are infected by the same potentially oncogenic HPV type in at least 50% of cases. Also, 50% of subclinical lesions showing only minimal histological changes (acanthosis and papillomatosis, without clear koilocytosis) contain HPV DNA, mostly type 42. In situ hybridization of such lesions indicate HPV-positivity, suggesting that these lesions may be infectious. Cytology does not seem to be specific enough to detect HPV infection in males. Moreover, virological studies do not confirm the hypothesis of an urethral reservoir of HPV. Morphology allows the detection of HPV-associated genital lesions in males. Current treatment protocols allow a 95% cure rate by easily applicable outpatient treatment modalities.
 ...
PMID:HPV-related genital lesions in men. 133 Sep 20

In 77 percent of patients suffering from a malignant carcinoid syndrome, administration of the somatostatin analog, octreotide (SMS 201-995, Sandostatin) induced clinical improvement coupled with a decrease in 24-hour urinary 5-hydroxyindole acetic acid (5-HIAA). This finding prompted an evaluation to determine the correlation between the presence of somatostatin receptors in tumor tissue and the response to octreotide in patients with advanced, metastatic, neuroendocrine tumors. In tissues of 31 tumors (20 carcinoid, eight islet-cell carcinoma, three medullary thyroid carcinomas), the presence of somatostatin receptors was analyzed by binding of the somatostatin analog 125I-Tyr3-SMS 201-995 and autoradiography. Receptors were detected in 16 of 20 samples of carcinoid tissues; all but one patient with receptor-positive tumors improved clinically after treatment with octreotide, and the urine 5-HIAA level was reduced a median of 63 percent (range, 39-94 percent) compared to values before treatment. Of the receptor-negative carcinoid patients, only one showed clinical improvement, which was minimal, and there was a negligible reduction in 5-HIAA after octreotide therapy. All eight patients with metastatic islet-cell carcinomas were positive for somatostatin receptors. Symptomatic improvement and a > 50 percent decrease in the level of at least one of the pathologically elevated marker hormones was seen in all eight. None of the three patients with medullary carcinoma of the thyroid had a decrease in calcitonin, and all three were initially somatostatin receptor-negative. We conclude that the presence of somatostatin receptors in malignant neuroendocrine tumor tissue appears to correlate with the response to octreotide therapy. Analysis of somatostatin receptors in malignant neuroendocrine carcinoma tissue should be included in future prospective clinical trials of this synthetic peptide.
 ...
PMID:The presence of somatostatin receptors in malignant neuroendocrine tumor tissue predicts responsiveness to octreotide. 136 90

Inhibition of tumor blood flow appears to a major antitumor mechanism of flavone acetic acid (FAA), although non-ischemic processes may also be a significant role. To distinguish between direct and immune effector cell-mediated cytotoxicity as the basis for non-ischemic killing, effects of FAA were compared in EMT6 spheroids grown entirely in vitro and spheroids recovered from the peritoneal cavities of mice after six days of in vivo growth (ex vivo spheroids). Approximately 50% of the cells in the latter case were of host origin (macrophages and lymphocytes). Ex vivo spheroids showed specific histological changes when exposed to FAA, including tumor cell rounding, apoptosis, depression of mitotic activity and dissolution of necrotic debris in the spheroid core. Quantitation of histological changes indicated these effects to be significantly greater in ex vivo than in vitro spheroids. The histological changes in FAA treated ex vivo spheroids were partially inhibited by dexamethasone. Oxygen tension did not influence the response of spheroids to FAA. The results suggest that immune effector cells, probably macrophages, mediate blood flow-independent antitumor effects of FAA.
 ...
PMID:The role of immune effector cells in flavone acetic acid-induced injury to tumor cells in EMT6 spheroids. 148 17

The correlation between mean arterial blood pressure (MABP) and vascular perfusion in SCC-VII/St tumors in mice was compared following administration of three vasoactive drugs: flavone acetic acid (200 mg/kg), hydralazine (5 mg/kg), or nicotinamide (500, 750, and 1000 mg/kg). MABP was measured by the direct method in unanesthetized, unrestrained mice bearing a carotid catheter. Vascular perfusion of the tumor was measured using the 86RbCl extraction method. Body temperature was maintained at 36 degrees to 37 degrees C after drug administration when necessary. All three drugs reduced MABP from a control value of 125 +/- 2 (s.e.) mm Hg in mice without tumors. Flavone acetic acid at this dose had the least effect on blood pressure, with a minimum of 86% of control values at 10 to 20 min, and a return to control values by 1 hr. However, it produced a profound reduction in tumor perfusion that lasted more than 48 hr. Hydralazine and nicotinamide reduced blood pressure to minima between 55% and 69% of control values within 30 min, followed by a gradual return toward control values by about 8 hr. The reduction in tumor perfusion by hydralazine paralleled its effect on blood pressure. However, nicotinamide produced a transitory, although not statistically significant, increase in tumor perfusion at the highest dose given. These data demonstrate that tumor blood flow modification by drugs is not necessarily the result of changes in MABP, and blood pressure changes alone do not inevitably lead to changes in tumor perfusion.
 ...
PMID:Pharmacological modification of tumor blood flow: lack of correlation between alteration of mean arterial blood pressure and changes in tumor perfusion. 153 Jul 55


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