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epipodophyllotoxin/cáncer de mama
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Enhanced DNA cross-link removal: the apparent mechanism of resistance in a clinically relevant melphalan-resistant human breast cancer cell line.
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Resistance to the cytotoxic effects of alkylating agents is a major limitation to their clinical efficacy. Although a number of animal and human tumor cell models have been developed to study this problem, it has proven difficult to achieve very high levels of resistance to alkylating agents in
Acute myeloid leukemia and myelodysplasia following intensive chemotherapy for breast cancer.
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Two major classes of therapy-related acute myeloid leukemias (t-AML) and myelodysplastic syndromes (t-MDS) have been described following the use of conventional doses of alkylating agents and epipodophyllotoxins. They are characterized by distinct clinical presentations and chromosomal
Acute monocytic or myelomonocytic leukemia with balanced chromosome translocations to band 11q23 after therapy with 4-epi-doxorubicin and cisplatin or cyclophosphamide for breast cancer.
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OBJECTIVE
To report five cases of acute monocytic or myelomonocytic leukemia after chemotherapy with 4-epidoxorubicin for breast cancer and to evaluate the risk of leukemia after the use of this drug.
METHODS
One hundred fifty-seven patients with advanced breast cancer were randomized to either
Mouse breast cancer resistance protein (Bcrp1/Abcg2) mediates etoposide resistance and transport, but etoposide oral availability is limited primarily by P-glycoprotein.
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The breast cancer resistance protein [BCRP (BCRP/ABCG2)] has not previously been directly identified as a source of resistance to epipodophyllotoxins.However, when P-glycoprotein (P-gp)- and Mrp1-deficient mouse fibroblast and kidney cell lines were selected for resistance to etoposide,
Excellent response to gemcitabine in a massively pre-treated woman with extensive cutaneous involvement after recurrence of breast cancer.
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A 50-year-old woman presented with local relapse of breast cancer 6 years after partial mastectomy. Relapse was accompanied by extended skin induration due to tumor cell embolization of dermal lymphatics. During the following years the patient was exposed to 11 different anti-tumor regimens
Current developments in antitumor antibiotics, epipodophyllotoxins, and vinca alkaloids.
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The antitumor antibiotics, epipodophyllotoxins, and vinca alkaloids represent a major portion of the therapeutic armamentarium against almost all treatable neoplasms. However, their use has been limited by the acquisition of drug resistance as well as by serious nonhematologic toxicities such as
Early secondary acute myelogenous leukemia in breast cancer patients after treatment with mitoxantrone, cyclophosphamide, fluorouracil and radiation therapy.
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BACKGROUND
The topoisomerase II-targeted drugs, epipodophyllotoxins and anthracyclines, have been shown to induce therapy-related AML (t-AML) characterized by a short latency period after chemotherapy, the absence of prior myelodysplastic syndrome and stereotyped chromosome aberrations. Few reports
Isolation of amplified and overexpressed DNA sequences from adriamycin-resistant human breast cancer cells.
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An MCF-7 human breast cancer cell line was selected which was 200-fold more resistant to Adriamycin than the wild type cell line. This Adriamycin-resistant (AdrR) cell line exhibited a multidrug-resistant phenotype and was cross-resistant to a wide range of antineoplastic agents including Vinca
A clinical trial of the oral form of 4'-demethyl-epipodophyllotoxin-beta-D ethylidene glucoside (NSC 141540) VP 16-213.
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A clinical trial of the oral form of VP 16-213 (NSC-141540), a semisynthetic podophyllotoxin, was undertaken. In 20 patients, treatment was started at 200 mg/day p.o. for 5 days; courses were repeated after a rest period of 16 days. Five patients were treated at the same dose, repeated with only
Etoposide: a semisynthetic epipodophyllotoxin. Chemistry, pharmacology, pharmacokinetics, adverse effects and use as an antineoplastic agent.
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Etoposide (VP 16) is a semi-synthetic derivative of 4'- demethylepipodophyllotoxin , a naturally occurring compound synthesized by the North American May apple (Podophyllum peltatum ) and the Indian species Podophyllum emodi Wallich . Although podophyllotoxins are classical spindle poisons causing
Effect of P-glycoprotein expression on the accumulation and cytotoxicity of topotecan (SK&F 104864), a new camptothecin analogue.
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Topotecan (TPT, 9-dimethylaminomethyl-10-hydroxycamptothecin) is the first topoisomerase I-directed cytotoxic agent to enter clinical trials in the United States in two decades. The effect of P-glycoprotein (Pgp) overexpression on TPT cytotoxicity was examined in CHRC5 (colchicine-resistant) and
Evaluation of 2,6-diamino-N-([1-(1-oxotridecyl)-2-piperidinyl]methyl)- hexanamide (NPC 15437), a protein kinase C inhibitor, as a modulator of P-glycoprotein-mediated resistance in vitro.
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We assessed the effect of the protein kinase C inhibitor 2,6-diamino-N-([1-(1-oxotridecyl)-2-piperidinyl]methyl)hexanami de (NPC 15437) on the action of anthracyclines, epipodophyllotoxins and vinca alkaloids in P-glycoprotein (Pgp)-expressing CH(R)C5 hamster ovary and MCF-7/Adria(R) human breast
The prognostic significance of membrane transport-associated multidrug resistance (MDR) proteins in leukemia.
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A major problem in the treatment of leukemia is the development of resistance to chemotherapeutic agents. There are several ways for cancer cells to develop resistance or defense mechanisms against cytotoxic drugs. This review paper will focus on membrane transport-associated multidrug resistance
Secondary acute leukemia and myelodysplastic syndrome with 11q23 abnormalities. EU Concerted Action 11q23 Workshop.
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Forty of the 550 patients (7%) entered to the 11q23 Workshop had secondary (s) acute lymphoblastic leukemia (nine cases), s-acute myeloid leukemia (25 cases, predominantly of FAB type M5), s-acute leukemia unspecified (one case) or s-myelodysplastic syndrome (five cases) following treatment for a
Treatment of malignant gliomas and brain metastases in adults with a combination of adriamycin, VM 26, and CCNU. Results of a phase II trail.
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Forty-three patients with inoperable or recurring malignant gliomas, and 30 patients with multiple recurring brain metastases were treated with a combination of Adriamycin (45 mg/m2) and 4-dimethyl-epipodophyllotoxin D-thenylidene (VM 26) (60 mg/m2 for 2 days) with
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