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Query: UMLS:C0476089 (endometrial cancer)
 11,379 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The steroid receptor content of the primary endometrial cancer of 22 patients who were treated for recurrent or advanced disease has been measured and correlated with response to medroxyprogesterone acetate. No patient with a progesterone receptor (PR)-negative tumor responded and only 2 patients with PR-positive tumors responded, perhaps related to the low levels of PR in the tumors. It waits to be assessed whether receptor status is as good a guide to response to hormone therapy as tumor differentiation, site of recurrence, or disease-free interval.
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PMID:Endometrial carcinoma: steroid receptors and response to medroxyprogesterone acetate. 315 30

Plasminogen activator activity (PAA) has been proposed as an indicator of aggressiveness of tumors and has been shown to be hormonally modulated. To test this hypotheses in human endometrial carcinoma, tumor explants were assayed for PAA secretion and the results correlated with histopathologic criteria of aggressiveness. The effect of medroxyprogesterone acetate (MPA) on PAA secretion was also investigated. Lower levels of PAA were found to be associated with tumors displaying aggressive tendencies. MPA generally decreased PAA secretion. No apparent correlation was found between estrogen or progesterone receptor concentrations and PAA levels.
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PMID:Plasminogen activator activity in human endometrial carcinoma. 316 Jun 38

Endometrial carcinoma is the most common genital malignancy in North America. However its pathogenesis, in particular its relationship with hyperplasia is not clear. To understand steroid hormonal interactions in the genesis and growth of human endometrial hyperplasia and carcinoma, we have assayed progesterone receptors in hyperplasia and neoplastic human endometrium by immunocytochemistry. The presence of progesterone receptors in target tissues is known to be a marker of both estrogen and progesterone action. The receptors were identified in fresh-frozen sections using a mouse monoclonal antiprogesterone receptor antibody (alpha PR6). The progesterone receptor content was high in the epithelium of hyperplasia without cytological atypia and low in the epithelium of endometrial intraepithelial neoplasia (hyperplasia with cytological atypia). In carcinomas there was a heterogenous distribution of progesterone receptors in the epithelium but low as compared to hyperplastic endometria without cytological atypia. The stroma contained relatively high progesterone receptor levels irrespective of whether the epithelium was hyperplastic or neoplastic.
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PMID:Immunocytochemical study of progesterone receptors in hyperplastic and neoplastic endometrial tissues. 316 59

Estrogen (ER) and progesterone receptor (PgR) status was determined in 41 women with operable endometrial cancer before and after administration of tamoxifen (TAM). The first sample was obtained by hysteroscopy to ensure a precise biopsy of neoplastic tissue; the second was done on the surgical specimen. PgR content was significantly increased after TAM treatment and this data was compared with the degree of tumor differentiation.
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PMID:Changes in receptor status after treatment with tamoxifen in endometrial cancer. 323 50

Prognostic factors for outcome of malignant disease should be based on objective assessments whenever possible, so that the results may be reproduced. In a prospective study, tumor samples from 75 patients were subjected to flow cytometric DNA analysis. Samples were also taken from 61 patients for estradiol and progesterone receptor measurements. The course of the disease was analysed with regard to ploidy and receptor status. Receptor status was significantly correlated with ploidy, as diploid tumors were more often receptor-positive or receptor-rich (greater than or equal to 30 fmol/mg protein). Mortality and recurrence rates were highest among patients with aneuploid or receptor-poor tumors. Ploidy, receptor status, histological grade, surgical stage, and myometrial invasion were found to be of significant prognostic value. By multivariate analysis, ploidy was indicated to be the best predictor, followed by surgical stage. DNA and receptor measurements are recommended in research on endometrial carcinoma, and may become useful in routine clinical work.
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PMID:DNA ploidy and steroid receptors as predictors of disease course in patients with endometrial carcinoma. 323 84

Monoclonal antibodies were used to investigate progesterone receptor structure (isoforms) in 33 primary human endometrial tumors. The monoclonal antibodies recognized on protein blots two progesterone receptor proteins with molecular weights of 116,000 and 81,000. The Mr 116,000 protein appeared as a triplet, while a single band was found for the Mr 81,000 protein. The triplet/singlet structure was found in all progesterone receptor-positive tumors, regardless of the degree of tumor differentiation. Protease activity, which gave rise to a false-negative pattern on protein blots, was found in approximately one-half of the tumors in which it was investigated. Inclusion of a cocktail of protease inhibitors during sample preparation resulted in the maintenance of the triplet/singlet progesterone receptor structure. Mixing experiments using a progesterone receptor-rich human endometrial carcinoma (EnCa 101), which lacks protease activity, and protease-containing primary tumor homogenates indicated that the protease was leupeptin sensitive. Interestingly, while the proteolytic activity reduced or eliminated the triplet/singlet progesterone receptor structure seen on protein blot analysis, it did not affect progesterone receptor concentration measured by Scatchard analysis. Sample preparation in the presence of protease inhibitors is therefore a requisite for structural analysis of the progesterone receptor in endometrial tumors.
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PMID:Progesterone receptor structure and protease activity in primary human endometrial carcinoma. 327 7

The relative incidence of endometrial carcinoma is obviously increasing as a disease of post-menopausal women with the ageing of the population in Japan. Growth of malignant endometrium tends to develop there both into the muscle and into the cavity. However, diagnosis in most cases is made by stage 1a (39.7%) and 1 b (19.0%) in FIGO classification. In the treatment of endometrial carcinoma, even after a simple hysterectomy in 89.2% of total cases 5-year cure rate may be reached to 80%, which has compared well with the 60% cure rate for cervical cancer. Some fractions of endometrial adenocarcinoma are estrogen-dependent and could therefore respond to antagonistic influences of progestogens. In a recent understanding, above theoretical grounds for hormone dependency and responsiveness of endometrial malignant lesions has been substantiated by data provided by steroid receptor determination. The high estrogen and progesterone receptor concentrations found in 70% of endometrial adenocarcinoma support the principle that endometrial adenocarcinoma is related to abnormal estrogenic stimulation. Those cancer are used as a model for in vitro and clinical evaluation of progestogen therapy.
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PMID:[Recent progress in cancer therapy in gynecology--endometrial cancer]. 338 37

Nuclear progesterone receptor (PR) concentrations were measured in 40 samples of endometrial adenocarcinoma and in 13 samples of normal endometrium taken from the same hysterectomy specimen. The levels of PR, expressed in pmol/mg DNA, were correlated with clinical and histopathologic characteristics of endometrial cancer and with the concentrations of progesterone in ovarian blood. The results suggest that PR levels might serve as a additional qualitative and quantitative prognostic risk factor in patients with endometrial cancer.
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PMID:Clinical importance of nuclear progesterone receptor (PR) in endometrial adenocarcinoma. 339 Dec 3

Three hundred forty-nine cases of primary endometrial carcinoma (endometrioid, adenosquamous, and clear-cell) were studied to investigate the relative prognostic importance of age, menopausal status, stage, histology, myometrial invasion, and estrogen and progesterone receptor content. Excluding menopausal status, all of these variables had a significant relationship to overall survival in a univariate analysis. Using a Cox multivariate regression analysis, stage, age, and an estrogen receptor value of more than 70 fmol/mg protein, combined with a progesterone receptor value of more than 30 fmol/mg protein, were independently associated with survival. The results demonstrate that for maximum prognostic information, both estrogen and progesterone content of tumors should be measured. Maximum prognostic information is obtained by using cutoff levels that are much higher than those traditionally accepted. This has particular relevance for patient stratification in clinical trials investigating receptor information and response to adjuvant or therapeutic treatment.
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PMID:The prognostic importance of steroid receptors in endometrial carcinoma. 340 54

Estradiol and progesterone receptor concentrations have been measured and their hormonal regulation extensively studied in normal human endometrium. However, in endometrial cancer, the biochemical assays presently used face the complex problem of tumor and tissue heterogeneity. This problem may be circumvented by immunocytochemistry on tissue sections proven to be histologically malignant. The in vivo experimental model developed in our laboratory is an ideal source of tissue necessary for purification of the progesterone receptor and antibody production. Hopefully, the physiology of the receptor may be studied under ideal conditions in this experimental system.
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PMID:Sex steroid receptors in normal and malignant endometrium. 352 89


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