Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0376358 (prostate cancer)
 59,338 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

One hundred patients with prostate cancer and two different control series [100 benign prostatic hyperplasia (BPH) patients and 100 general hospital patients] were matched to each other upon hospital admittance, age (+/- 3 years) and date of admission (+/- 3 months), and directly interviewed during admission from 1981 to 1984 in Kyoto, Japan. Major dietary findings derived from a quantitative food frequency technique for estimating usual diet are as follows. (a) The smaller the dietary intake of beta-carotene and vitamin A as well, the higher the risk, with a highly significant linear trend. From the beta-carotene analyses, the relative risk (95% confidence interval) for the lowest intake quartile relative to the highest was 2.10 (0.98-4.47) for the uncorrected intake, 2.35 (1.08-5.12) for the intake per kg, and 2.94 (1.34-6.44) for the intake per kcal in the comparison with BPH patients; 2.88 (1.31-6.32), 2.56 (1.14-5.76), and 3.50 (1.52-8.06), respectively, in the comparison with hospital controls. The corresponding relative risk obtained from the vitamin A analyses was 2.82 (1.30-6.14), 2.64 (1.24-5.60), and 3.29 (1.47-7.35) in due order in the comparison with BPH patients; 2.69 (1.22-5.94), 4.78 (1.98-11.52), and 3.50 (1.52-8.06) in the comparison with hospital controls. (b) beta-Carotene as well as vitamin A contained in green/yellow vegetables were significantly protective, and those in seaweeds and kelp suggestively protective. But those in fruits appeared to enhance the risk. (c) The risk reduction by dietary beta-carotene and vitamin A was significant in the older men (70-79 years), but not in the younger men (50-69 years). (d) Total energy intake and the dietary intake of fat, protein, carbohydrate, water, fiber, ash, such vitamins as retinol, B1, B2, C, and niacin, and such minerals as calcium, potassium, sodium, phosphorus, and iron were not linked with prostate cancer risk. (e) A protective effect of dietary beta-carotene and vitamin A against prostate cancer could be related to the low overall fat intake in Japan.
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PMID:Dietary beta-carotene and cancer of the prostate: a case-control study in Kyoto, Japan. 244 78

Recently, there has been interest over detection of malignant tumors by water-Suppressed Proton Nuclear Magnetic Resonance Spectroscopy (1 HNMR) of plasma lipoproteins (N. Engl. J. Med., 1986, 315, 1369-76). We performed a similar prospective and blinded study comprising 75 subjects; 40 control (C), 15 untreated prostate cancer patients (PC) and 20 patients with benign prostate tumors (BT). We measured the parameter W 1/2, as mean of the full width at half height of the resonances of the methyl and methylene groups of the lipids of the plasma lipoproteins which is inversely related to the spin-spin apparent relaxation time (T2*). W 1/2 values were determined at a fixed baseline of 310 Hz. The W 1/2 mean values were 37.6 +/- 3.7 Hz for C, 37.4 006 5.2Hz for PC and 36.4 +/- 3.9 Hz for BT, essentially identical for all three groups. Furthermore, no difference was seen between any group on scatter pattern that could serve as a basis for a useful detection test. The major difficulty in the determination of W 1/2 was due to interference of metabolite protons (lactate) within the lipoprotein resonance signal. There was no correlation seen between W 1/2 triglyceride, total cholesterol, HDL-cholesterol and (LDL + VLDL)-cholesterol levels. We conclude the Water-Suppressed 1HNMR Spectroscopy of plasma lipoproteins as performed, is not a valid method for detection of prostate cancer.
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PMID:[Prostatic tumors. Detection by proton nuclear magnetic resonance spectroscopy of plasma lipoproteins]. 247 63

The results of a study on the optimization of external irradiation of prostatic cancer are discussed. The study was performed with the aid of an automatic water phantom, an automatic densitometer, and a computerized treatment planning system using an anthropometric phantom Alderson. The following parameters were studied: Dose gradient, the size of areas of selected isodoses, and the shape of the 90% isodose. At present, we consider that the twosector biaxial arc technique characterized by an arc angle of 120 degrees, a distance of the arc axes of 3 cm, employing a 20 MeV X-ray of a linear accelerator is the optimal technique for target irradiation of carcinomas of the prostate.
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PMID:Optimization of radiation therapy in prostatic cancer. 318 42

In 1985, a dosimetry intercomparison was performed at all 20 radiotherapy centres in The Netherlands. Absorbed dose was determined with an ionization chamber under reference conditions in a water phantom for cobalt-60 gamma-ray and megavoltage X-ray beams. The mean difference between measured and stated dose values was 0.5% with a standard deviation of 1.9%, but up to 6% at maximum. As soon as all institutes apply a common dosimetry protocol, this maximum difference will reduce to about 2%. In addition, an anthropomorphic phantom was irradiated to simulate the treatment of a prostatic cancer. The dose, determined with an ionization chamber at the isocentre and thermoluminescent dosimeters (TLD) powder at several points situated in the target volume, the bladder and the rectum, was compared with the stated dose calculated with the local planning system. Only small differences were found between the measured and stated dose at the isocentre: on the average 1.5%, with a standard deviation of 1.5%. The difference between stated and measured dose at several points situated in the target volume was on the average 0.4%, with a standard deviation of 5.2%. Almost the same result was found for a point situated in the bladder. In the rectum, the average difference was about 4%, however, with a large standard deviation, 18%, due to the relatively steep dose gradient at these points.
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PMID:Dose intercomparison at the radiotherapy centres in The Netherlands. 1. Photon beams under reference conditions and for prostatic cancer treatment. 360 28

Human prostatic tissue and expressed prostatic secretions (EPS) from patients with benign prostatic hyperplasia (BPH) and prostate cancer were incubated with (1 beta 3H) androstenedione. The extent of aromatization was determined by measuring the transfer of 3H from the 1 beta position into water. The amount of 3H2O recovered corresponds to the estrogens formed. Tissue from 5 patients with BPH yielded 2.13 (+/- 1.05) pmol/mg protein/h while the EPS from the same patients yielded 727 fmol/mg protein/h. In patients with prostate cancer the mean formation of estrogens was 388 fmol/mg protein/h (+/- 75). 4-hydroxy-androstenedione, an aromatase inhibitor, successfully inhibited aromatization in BPH and prostate cancer 53-98%.
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PMID:Aromatization of androstenedione to estrogen by benign prostatic hyperplasia, prostate cancer and expressed prostatic secretions. 362 51

Prostatic cancer is frequently associated with new bone formation although the tumor-derived factors responsible for changes in bone cell function have not been identified. We have examined the synthesis of osteoblast-stimulating factors in a cultured human prostatic cancer cell line (PC-3) and show that conditioned medium from PC-3 cells stimulate mitogenesis and alkaline phosphatase in cells with the osteoblast phenotype (cultured rat osteosarcoma cells) and collagen synthesis in fetal rat calvaria. In order to characterize tumor-derived gene products which stimulate cells of the osteoblast phenotype messenger RNA (mRNA) was isolated from PC-3 cells and microinjected into Xenopus laevis oocytes. mRNA-directed translation products which were secreted into the oocyte medium were collected and assayed for a number of osteoblast stimulating properties. Translation products from PC-3 mRNA-injected oocytes stimulated division of cultured osteosarcoma cells by 8-fold and increased DNA synthesis as measured by incorporation of [3H]thymidine into these cells. In addition, tumor-derived translation products stimulated the production of alkaline phosphatase activity, a marker enzyme for bone formation, in cultured osteosarcoma cells. Oocytes injected either with water or with mRNA from a tumor not associated with bone formation were devoid of these activities. Total mRNA from the human prostatic cancer cells was then denatured and fractionated by size by agarose gel electrophoresis. When individual fractions of mRNA were eluted from the gel, translated in Xenopus oocytes, and the secreted translation products were tested for alkaline phosphatase-stimulating activity on osteoblast-like cells, the majority of the activity could be recovered in a mRNA fraction which was approximately 1800 bases in length. These results indicate that the PC-3 prostatic cancer cell line synthesizes a mRNA of approximately 1800 bases which codes for a heretofore unrecognized osteoblast-stimulating factor.
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PMID:Identification of a messenger ribonucleic acid fraction in human prostatic cancer cells coding for a novel osteoblast-stimulating factor. 386 13

Vasography is a common diagnostic procedure utilized in evaluating the male genital tract for causes of azoospermia, for evaluation of persistent perineal pain and seminal vesiculitis, and recently used in the staging of prostate cancer. In order to evaluate the effects of injectable agents on the healthy vas deferens, 7 groups of 10 rats had the left vas deferens injected by vasopuncture with saline, 4 contrast agents, doxycycline and absolute alcohol. The animals were sacrificed 8 weeks later, and were examined for patency of the vas and inflammatory response. Results revealed that vasopuncture did not produce obstruction. Vasography with water-soluble contrast media does entail a low risk of inflammation in the rat, but produces no obstruction. Intra-vas injection of doxycycline, injected by some for treatment of chronic seminal vesiculitis and perineal pain, is not deleterious in the rat model.
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PMID:Vasography: effect of various agents on vas deferens patency. 403 62

Ten patients with metastatic prostatic cancer no longer responsive to conventional doses of estrogens (stilbestrol 15 mg. daily or equivalent) were treated with high doses of diethylstilbestrol diphosphate. Objective responses lasting from three to fifteen months were obtained in four patients; three of the patients had previously shown progressive disease following orchidectomy.Toxic manifestations consisted mainly of increased gynecomastia and water retention. No serious cardiovascular complications were encountered. This dose-response effect of estrogens indicates the persistence of hormone-dependent tumours in some patients with recurrent disease despite conventional estrogen therapy.
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PMID:High-dose diethylstilbestrol diphosphate therapy of prostatic cancer after failure of standard doses of estrogens. 474 28

Thirty-five patients with advanced cancers were treated with estramustine phosphate tablets (Estracyt). Doses ranged between 420 mg and 700 mg daily. One partial response was documented in a hormone resistant prostatic cancer patient. Four minor responses (less than 50% responses, or less than one month more than 50% response) were obtained; one in a hormone resistant prostatic cancer, two in metastatic colorectal cancers; and another in a malignant melanoma. Toxicity phenomena included nausea (9/35 - 25%), water retention (4/35 - 11.5%) and mild elevation of alkaline phosphatase (2/35 - 6%). Other toxicity effects were vaginal bleeding in two women, acne in one woman and mild pruritus in another patient. Myelosuppression and immune suppression were not significantly detected.
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PMID:Oral estramustine phosphate (Estracyt): a broad phase II study. 659 4

A high frequency radiator has been developed for the treatment of prostate cancer by hyperthermia. The applicator produces a deep seated hot spot. The radiator has an outer diameter of 20 mm and an insertable length of about 175 mm. A high frequency cylindrical slot antenna inside the applicator is cooled by water. The frequency used is 433.9 MHz, one of the frequencies allowed for medical therapy in the F.R.G. A control system regulating the power output of the radiator avoids damage to the tissue around the prostate, especially the rectum mucosa and the tissue between rectum and prostate. About 60 experiments with male dogs proved that local heating of the prostate is possible with the help of the developed applicator without any damage in the surrounding tissue.
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PMID:Radiofrequency-induced hyperthermia in the prostate. 692 92


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