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Methyl-p-hydroxyphenyllactate-esterase activity in breast cancer: a potentially new prognostic factor in short-term follow-up.

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We assayed methyl-p-hydroxyphenyllactate esterase (MeHPLAase) activity in 48 cases of primary breast cancer. MeHPLAase activity did not show significant correlation with estrogen receptor and progesterone receptor levels. No significant relationship was found between enzymatic activity and tumor

Genetically engineered human neural stem cells with rabbit carboxyl esterase can target brain metastasis from breast cancer.

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Neural stem cells (NSCs) led to the development of a novel strategy for delivering therapeutic genes to tumors. NSCs expressing rabbit carboxyl esterase (F3.CE), which activates CPT-11, significantly inhibited the growth of MDA-MB-435 cells in the presence of CPT-11. F3.CE cells migrated selectively

Inverse changes of serum glucuronidase and esterase of breast cancer patients on estrogen therapy.

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Comparative two-dimensional polyacrylamide gel electrophoresis (2D-PAGE) of human milk to identify dysregulated proteins in breast cancer.

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Breast cancer (BC) remains a major cause of mortality, and early detection is considered important for reducing BC-associated deaths. Early detection of BC is challenging in young women, due to the limitations of mammography on the dense breast tissue of young women. We recently reported results of

Estradiol esters can replace 17 beta-estradiol in the stimulation of DNA and esterase synthesis by MCF-7 cells: a possible role for the estrogen-sensitive MCF-7 cell esterase.

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In this communication we extend our earlier observations on estrogen-sensitive carboxyl esterases in MCF-7 human breast cancer cells able to hydrolyze esters of estradiol. Using either estradiol acetate or p-nitrophenyl hexanoate as substrates, esterase activity was found to increase 2-3-fold in

Nuclear type-ii [h-3] estradiol binding-sites in mcf-7 human breast-cancer cells - binding interactions with 2,6-bis-([3,4-dihydroxyphenyl]-methylene)cyclohexanone esters and inhibition of cell-proliferation.

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Previous studies from this laboratory demonstrated that 2,6-bis-([3,4-dihydroxyphenyl]methylene)cyclohexanone (BDHPC) and related compounds mimic methyl p-hydroxyphenyllactate (MeHPLA) as endogenous ligands for nuclear type II [H-3]estradiol binding sites. Occupancy of type II sites by these agents

Therapeutic potential of stem cells expressing suicide genes that selectively target human breast cancer cells: evidence that they exert tumoricidal effects via tumor tropism (review).

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Breast cancer is the most prevalent cancer in women worldwide and is classified into ductal and lobular carcinoma. Breast cancer as well as lobular carcinoma is associated with various risk factors such as gender, age, female hormone exposure, ethnicity, family history and genetic risk

Reduced nonspecific steroidal esterase activity in human malignant tumor tissue from liver, colon and breast when compared to peritumoral and normal tissue levels.

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The levels of a nonspecific steroidal esterase estimated as alpha naphthyl acetate esterase (ANAE) activity were measured in apparently normal (peritumoral) tissue of liver, colon and breast cancer patients, in malignant tumor tissue from the same patients and in normal colon tissue from healthy

Transcriptional targeting of human liver carboxylesterase (hCE1m6) and simultaneous expression of anti-BCRP shRNA enhances sensitivity of breast cancer cells to CPT-11.

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BACKGROUND The major factor limiting the efficacy of breast cancer chemotherapy is multidrug resistance due to overexpression of the breast cancer resistance protein ATP-binding cassette, sub-family G (WHITE), member 2 (ABCG2). We hypothesized that conversion of camptothecin-11 (CPT-11) to its

[Differentiation of lymphocyte populations in the blood of breast-cancer patients].

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The number of T lymphocytes has been determined in the peripheral blood of 90 women (65 patients with breast cancer and 25 healthy controls) using a sheep-erythrocyte rosetting technique and a cytochemical method for intracellular localization of a nonspecific acid esterase. Both tests were in

Intracellular esterase activity in living cells may distinguish between metastatic and tumor-free lymph nodes.

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BACKGROUND One of the major clinical problems in breast cancer detection is the relatively high incidence of occult lymph node metastases undetectable by standard procedures. Since the ascertainment of breast cancer stage determines the following treatment, such a "hypo-diagnosis" leads to

[Plasma granulocyte-macrophage colony stimulating factor (GM-CSF) and activity of enzymes in granulocytes of breast cancer patients].

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GM-CSF (granulocyte-macrophage colony stimulating fractor) is a hematopoietic growth factor. In vitro it stimulates the proliferation of myeloid progenitors and formation of granulocyte and macrophage colonies. It was found that GM-CSF in vitro also stimulates the phagocytic function of mature

Dual stimuli polysaccharide nanovesicles for conjugated and physically loaded doxorubicin delivery in breast cancer cells.

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The present work reports the development of pH and enzyme dual responsive polysaccharide vesicular nano-scaffolds for the administration of doxorubicin via physical loading and polymer-drug conjugation to breast cancer cells. Dextran was suitably modified with a renewable resource 3-pentadecyl

Esterase, estradiol and sex hormone-binding globulin in breast cyst fluid.

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Women who have palpable breast cysts lined by apocrine epithelium (intracystic Na/K < 3) may have a higher risk of developing breast cancer than those with breast cysts lined by flattened epithelium (intracystic Na/K > 3). Esterase converts fatty acid esters of E2 to unconjugated E2 and could

An estrogen-dependent esterase activity in MCF-7 cells.

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The presence of steroidal esters in hormonally sensitive tissues lends importance to the esterases which convert the biologically inactive adducts to the parent potent forms. Accordingly, esterase-activities were studied in a human breast cancer model--the MCF-7 cell line. Tritiated estradiol

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