epipodophyllotoxin/sarkom

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Granulocytic sarcoma preceding leukaemic transformation in myelofibrosis.

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A granulocytic sarcoma expanded the malar region in a patient with proven myelofibrosis over a 22 month period before undergoing rapid increase in size concomitantly with transformation to acute granulocytic leukaemia in the marrow and the widespread appearance of subcutaneous tumour deposits. Rapid

Ewing's Sarcoma and Second Malignancies.

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Ewing's sarcoma (ES) is a rare tumor that is most common in children and young adults. Late effects of ES therapy include second cancers, a tragic outcome for survivors of such a young age. This paper will explore the frequencies and types of malignancies that occur after ES. Additionally, it will

Second cancers in patients with the Ewing sarcoma family of tumours.

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BACKGROUND Patients are at risk of second malignancies (SM) after treatment for Ewing sarcoma family of tumours (ESFT). METHODS We performed a retrospective review of 237 patients with ESFT treated at our institution from September 1979 through to February 2004. Cumulative incidence (CI) of SM by

In vitro test-system for chemo- and thermosensitivity: an analysis of survival fractions and cell-cycle distributions in human Ewing's sarcomas as a modelfor tumors in pediatric oncology.

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BACKGROUND Tumor cell resistance to anticancer drugs is the primary reason for treatment failure in childhood cancer. Resistance can exist at the onset of treatment or can become clinically apparent under selective pressure of drug exposure. In vitro predictive tests are important for the

Pharmacodynamics and long-term toxicity of etoposide.

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Etoposide has been used in the treatment of a wide variety of neoplasms, including small-cell lung cancer, Kaposi's sarcoma, testicular cancer, acute leukemia, and lymphoma. Its current therapeutic use is limited by myelosuppression, particularly neutropenia. Pharmacodynamic studies of etoposide

Thiol manipulation as a means of overcoming drug resistance in a novel cyclophosphamide-induced resistant cell line.

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Acquired drug resistance is a major obstacle in the successful treatment of cancer by chemotherapy. To study mechanisms of resistance to alkylating agents, we have derived an in vitro subline of the murine KHT-iv sarcoma, KHT-rcp/iv, that has acquired resistance to cyclophosphamide. Compared to the

Second malignant neoplasm following childhood cancer: A nested case-control study of a recent cohort (1987-2004) from the Childhood Cancer Registry of the Rhône-Alpes region in France.

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From a population-based cohort of cases of first cancers diagnosed between 1987 and 2004, before the patient's age of 15 years, the authors conducted a nested case-control study, matching 64 patients who experienced a second malignant neoplasm (SMN) with 190 controls. SMNs comprised 10 leukemia or

Molecular mechanisms of multidrug resistance in cancer chemotherapy.

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The occurrence of multidrug resistance (MDR) is one of the main obstacles in the successful chemotherapeutic treatment of cancer. MDR cell lines are resistant to the so-called naturally occurring anti-cancer drugs, such as anthracyclines, Vinca alkaloids and epipodophyllotoxins, but are not

The pharmacology of intravenous and oral etoposide.

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The epipodophyllotoxin derivative etoposide (VP-16) has been in widespread use both alone and in combination chemotherapy for the past decade. It has phase-specific cytotoxicity that acts in the last S and G2 phases of the cell cycle. Although its mode of action is not certain, it appears to act by

Secondary acute myeloid leukemia after etoposide therapy for retinoblastoma.

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Retinoblastoma is the most common eye tumor in children and is highly curable. Patients with hereditary retinoblastoma, have an increased risk of developing additional tumors, predominantly sarcomas. Most chemotherapy regimens used in retinoblastoma include etoposide, an epipodophyllotoxin

Antitumor agents. II: Regio- and stereospecific syntheses of 1-beta-alkyl-1-desoxypodophyllotoxin derivatives and biological activity.

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1-beta-Alkyl derivatives of 1-desoxypodophyllotoxin were synthesized, and their cytotoxicity and inhibitory effects on DNA topoisomerase II (Topo-II) and tubulin polymerization were examined. The reaction of epipodophyllotoxin derivatives (1a-c) with trimethylallylsilane in the presence of boron

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