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Biomedical subjects

S Saez

Publications and source records attributed to S Saez.

At least 73 records · Page 4Linked to original sources
PubMed1981

[Tamoxifen induced fluorescence as a marker of hormone receptors: cytological study of fine needle biopsy of malignant breast tumors in treated women].

Tamoxifen-induced fluorescence was used as a marker of hormone receptors in breast tumor cytology. Patients receiving Tamoxifen were compared to patients without such a therapy. Only those receiving this treatment showed fluorescence in their malignant cells. Moreover, in this group, such a fluorescence was noticed only in those patients with hormonal receptors in their tumor cells and not in the patients without estrogen and progesterone receptors. Such a technique seems to be a good method for predicting response to hormonal therapy.

Biopsy, Needle↗
PubMed1981

Androgen, estrogen and progestin binding sites in human leukemic cells.

Sex steroid binding capacity was investigated in malignant cells from 32 patients with acute non-lymphoblastic leukemia (25 patients with acute myeloid leukemia, 4 with subacute leukemia, 3 with chronic myeloid leukemia in blast crisis) and 30 patients with acute lymphoblastic leukemia. Specific binding of labelled steroids was characterized either by competition assay in cytosol fraction or by whole-cell incorporation. In some cases further characterization of the receptor complex was attempted by sucrose gradient centrifugation and gel filtration column. The results show the presence of specific binding sites for dexamethasone (22/32 in non ALL and 30/30 in ALL), for estrogens (11/15 in non-ALL and 5/12 in ALL), for progestins (8/25 in non-ALL and 5/13 in ALL) for androgens when R1881 was used as ligand (8/21 in non-ALL and 5/10 in ALL patients) but only 1/13 non-ALL patients and no ALL patients when labelled 5 alpha DHT was used. These results indicate that the blast cells from patients with acute leukemia contain specific proteins binding steroids with a high affinity. Our results for dexamethasone receptors are similar to those described in the literature in ALL and non-ALL.

Binding, Competitive↗
PubMed1980

[Operable carcinoma of the breast. Prognostic value of estradiol receptors. Preliminary report (author's transl)].

151 women were treated for potentially curable breast cancer. Their tumors were routinely analysed for estrogen receptors by the dextran-coated charcoal technic. Data were analyzed in relation to several parameters: age, age of menstruation, menopausal status, tumor size, TNN staging, axillary node status, nature of treatment. We have examined the pronostic implication of an ER negative content (ER-) in the primary tumor. We have found that the absence of detectable estrogen receptor in primary breast tumor appears to be correlated with a short disease free interval. In positive axillary node patients the value of the disease free interval is significantly shorter in ER- than in ER+ group: 11.5 months versus 23.5 (p less than 0.01).

Adult↗
PubMed1979

Diamine oxidase and polyamine oxidase activities in normal and transformed cells.

1. The activity of diamine oxidase (EC 1.4.3.6) in normal rat kidney cells and in normal rat kidney cells transformed by avian sarcoma virus (B77 strain) growing in tissue culture varies with the stage of growth. There is an initial stimulation of activity by 24h after seeding, followed by a steep decline during exponential growth (48-72h). Enzyme activity decreases even further as the cells reach saturation density (confluence) after 4 days in culture when the activity in normal rat kidney cells is twice as high as that in transformed cells. 2. Differences of about the same order of magnitude are observed between transformed human cells HeLa, HEp2 (a human epithelioid carcinoma) and normal human fibroblasts, in chicken cells between normal myeloblasts and leukaemic myeloblasts, and in rats between biopsy material from normal mammary tissue and 9,10-dimethylbenz[a]anthracene-induced mammary tumours. 3. Polyamine oxidase activity also varies with the growth of transformed rat kidney cells, but shows no significant variation with the growth of normal rat kidney cells between 24 and 96h after seeding. The activity in cells at confluence is from 3- to 5-fold lower in the transformed than in the normal rat kidney cells. 4. A similar 5-10-fold decrease in activity has been found in 9,10-dimethylbenz[a]anthracene-induced mammary tumours in rats and in human oesophageal tumours. 5. Possible reasons for these observations and the contribution of these two enzymes to cellular putrescine concentrations are discussed.

Amine Oxidase (Copper-Containing)↗
PubMed1979

Evidence for natural antibodies (IgG) to polyamines in human sera.

Human sera contain IgGs that react with latex-putrescine spheres. Identification of the IgGs has been achieved by polyacrylamide gel electrophoresis and their reaction with peroxidase-labeled antihuman gamma-chain-specific antibodies. The inhibition of IgG fixation to latex-putrescine spheres by free spermine and putrescine provides evidence that these IgGs are specific for polyamines.

Antibody Specificity↗
PubMed1979

Mammary carcinogenesis in Sprague--Dawley rats following 3 repeated exposures to 14.8 MeV neutrons and steroid receptor content of these tumor types.

166 Sprague-Dawley Rats (148 males and 118 females) submitted to different hormonal conditions were exposed to 3 repeated whole-body irradiations of 14.8 MeV neutrons or sham-irradiated between 50 and 65 days of age (total absorbed doses: 3 x 2 rad and 3 x 8 rad). They were observed for 11 months. In the male group, a small number of tumors was obtained. In the female group, 75 breast neoplasms were scored in 41 of 78 irradiated animals (54 fibroadenomas, 20 adenocarcinomas and 1 fibrosarcoma). A second group of benign and malignant tumors was observed from 200 days on. The neoplastic response to fast neutron fractionated irradiations was increased by pregnancy with subsequent lactation. Estradiol and progesterone receptors were measured in 34 tumor samples. Fibroadenomas (1;5) and adenocarcinomas (1;3) bound labelled steroids. Like in human breast cancer metastases, steroid receptors are found in recurrences only if present in the primary tumor.

Adenocarcinoma↗
PubMed1978

Increases in steroid binding globulins induced by tamoxifen in patients with carcinoma of the breast.

The effects of tamoxifen on cortisol binding globulin (CBG) and sex hormone binding globulin (SHBG) were studied in 25 women and one man with breast cancer. These patients were in various endocrine states according to age (15 post-menopausal women) or previous endocrine surgery (ovariectomy, two patients; ovariectomy plus adrenal surgery, five patients; hypophysectomy, three patients; ovariectomy plus hypophysectomy, two patients). The administration of tamoxifen (20-40 mg/day) resulted in increases in the level of CBG in all patients (mean rise in binding capacity 10.8 microgram cortisol/100 ml plasma) and in the level of SHBG in 21 patients (mean rise in binding capacity 0.79 microgram dihydrotestosterone/100 ml plasma for all patients). These increases were positively correlated. They were not associated with any alteration in the association constants of the steroid binding globulins. The effect of tamoxifen on CBG diminished with increasing age. The changes in the levels of CBG and SHBG were independent of the endocrinological state of the patient. It is inferred that tamoxifen has a direct oestrogen-like action on the liver which results in increased production of CBG and SHBG. Tamoxifen therapy for carcinoma of the breast appeared to be least effective in those patients in whom the drug caused the highest increase in the concentration of CBG.

Adult↗
PubMed1978

Estradiol and progesterone receptor levels in human breast adenocarcinoma in relation to plasma estrogen and progesterone levels.

Plasma estrogen and progesterone levels were determined in 77 premenopausal and 137 menopausal women at the same time that estradiol receptor (ER) and progesterone receptor (PGR) assays were carried out on their breast cancers. The frequency of ER and PGR is approximately the same in premenopausal and postmenopausal women, but the ER content is much higher in postmenopausal women. Although this is usually ascribed to the occupancy of receptors by endogenous estrogen in premenopausal women, our observations suggest that this is unlikely. The higher ER content in postmenopausal women is probably due to the fact that the cyclic progesterone increase in premenopausal women limits estrogen stimulation of ER synthesis. Our data suggest that the circulating levels of estrogen in postmenopausal women are sufficient to stimulate ER and PGR when ER is functional. In premenopausal women, on the other hand, high levels of circulating progesterone may inhibit PGR, and the absence of PGR in the breast cancers of premenopausal women should be interpreted warily if the plasma level of progesterone is unknown.

Adenocarcinoma↗
PubMed1978

Relation between steroid receptor content and the response to hormone addition in isolated human breast cancer cells in short-term culture.

The hormone dependence of human breast tumors has been investigated in two ways: (a) estradiol and progesterone receptor determination in tumor tissue; and (b) measurement of the growth-stimulating effect of hormones on cells in short-term culture. Preliminary results from 15 tumors suggest that such a model may be used for human breast tumors. The behavior of the cultures under hormonal stimulation depended on their receptor content. In this series of patients, the tumors containing both estradiol and progesterone receptors were stimulated by addition of insulin and estradiol while the tumors containing either estradiol receptor alone or no steroid receptor were not modified by hormonal addition.

Breast Neoplasms↗
PubMed1977

[Hormonal factors in the prediction of hormonedependency of breast cancer].

Biological diagnostic of hormonedependency of breast tumors is important for the choice of treatment. Modifications of the metabolism of steroids, oestrogens, androgens, and glucocorticoids allowed a first approach. More recently, investigations have been made on breast tissue receptors for hormones that are involved in the growth of the normal gland. It is actually suggested that one could predict the hormonedependency of a tumor when it contains both receptors for oestradiol and progesterone.

Breast Neoplasms↗
PubMed1976

Existence of receptors bound to endogenous estradiol in breast cancers of premenopausal and postmenopausal women.

The amounts of free and occupied estrogen receptors were determined in cytosols and cellular (cytoplasmic + nuclear) extracts of 23 human breast cancers. In vivo undersaturation of the receptors was observed in all tumors. A positive correlation was found between the degree of saturation and the concentration of circulating estrogens in premenopausal women. The saturation of the sites was higher in cellular extracts than in cytosols, pointing to the existence of receptor-estradiol complexes bound to nuclei. Our results suggest that the absolute number of occupied receptors depends upon the level of available cytoplasmic receptors as well as upon the level of tissue estradiol.

Adenocarcinoma↗