camptothecin/sarcoma

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Camptothecin-based regimens for treatment of ewing sarcoma: past studies and future directions.

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New therapies are needed to improve survival for patients with Ewing sarcoma. Over the past decade, camptothecin agents such as topotecan and irinotecan have demonstrated activity against Ewing sarcoma, especially in combination with alkylating agents. Previous studies have shown camptothecin-based

Studies of the effect of chloramphenicol, ethidium bromide and camptothecin on the reproduction of Rous sarcoma virus in infected chick embryo cells.

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A function for mitochondria in the reproduction of Rous sarcoma virus (RSV) in chronically and newly infected chick embryo cells was studied by using chloramphenicol and ethidium bromide. Chloramphenicol (CAM) and ethidium bromide (EB) were both shown to decrease the rate of growth of infected chick

Phase II study of 9-nitro-camptothecin in patients with advanced chordoma or soft tissue sarcoma.

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OBJECTIVE The purpose of this trial was to assess the objective clinical response, toxicity, and time to progression of treatment with 9-Nitro-Camptothecin (9-NC) in patients with advanced chordoma, soft tissue sarcoma (STS), and gastrointestinal stromal tumor (GIST). METHODS Patients with locally

Changes in the nuclear membrane surface following transformation of chick embryo fibroblasts by rous sarcoma virus: the effect of camptothecin.

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Phase II study of topotecan (NSC 609 699) in patients with recurrent or metastatic soft tissue sarcoma.

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BACKGROUND New drugs are needed for treatment of unresectable or metastatic soft tissue sarcoma. Topotecan, a semisynthetic derivative of the alkaloid, camptothecin, exerts its cytotoxic effect through inhibition of topoisomerase I. METHODS Thirty-two adult patients with locally advanced or

PLK1 is a critical determinant of tumor cell sensitivity to CPT11 and its inhibition enhances the drug antitumor efficacy in squamous cell carcinoma models sensitive and resistant to camptothecins.

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Intrinsic and acquired tumor drug resistance limits the therapeutic efficacy of camptothecins (CPTs). Downregulation of the mitotic kinase PLK1 was found associated with apoptosis induced by SN38 (CPT11 active metabolite). We investigated the role of PLK1 in the cell response to CPTs in squamous

A phase II window study of irinotecan (CPT-11) in high risk Ewing sarcoma: a Euro-E.W.I.N.G. study.

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BACKGROUND The prognosis for patients with nonpulmonary metastatic Ewing sarcoma remains poor with survival in the order of 15-20%. The need to introduce effective new agents into clinical practice is clear. Based on a preclinical rationale of responses in xenografts and backed by a phase I study in

Exatecan in pretreated adult patients with advanced soft tissue sarcoma: results of a phase II--study of the EORTC Soft Tissue and Bone Sarcoma Group.

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No standard treatment is established for patients with advanced soft tissue sarcoma after previous chemotherapy with anthracyclines and ifosfamide, given either in combination or sequentially. Exatecan (DX-8951f) is a totally synthetic analogue of the topoisomerase I-inhibitor camptothecin, which

Camptothecin and taxol: historic achievements in natural products research.

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The research team of Dr. Monroe E. Wall and Dr. Mansukh C. Wani of Research Triangle Institute discovered two first-in-class life-saving chemotherapeutic agents. Camptothecin, first isolated and identified from Camptotheca acuminata, was found to kill cancer cells uniquely via topoisomerase I

Small-molecule screen identifies modulators of EWS/FLI1 target gene expression and cell survival in Ewing's sarcoma.

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Ewing's sarcoma family of tumors (EFT) is characterized by the presence of chromosomal translocations leading to the expression of oncogenic transcription factors such as, in the majority of cases, EWS/FLI1. Because of its key role in Ewing's sarcoma development and maintenance, EWS/FLI1 represents

9-methoxycamptothecin from Nothapodytes foetida induces apoptosis in murine sarcoma S180 cells.

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9-Methoxycamptothecin (MCPT) was found to have antitumour activities through topoisomerase inhibition. However, the type of cell death induced in the tumour cells treated with MCPT was not elucidated. In this study, MCPT and camptothecin were isolated from Nothapodytes foetida distributed in Hubei

[Studies on the preparation of camptothecin niosomes].

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OBJECTIVE To study the non-ion surfactant vehicle (niosome) entrapped-camptothecin. METHODS The niosome loaded with camptothecin was prepared from Span and cholesterol using aqueous dispersion of film. The vehicles were visualised by transmission electron microscopy and sized by laser particle

Trabectedin Followed by Irinotecan Can Stabilize Disease in Advanced Translocation-Positive Sarcomas with Acceptable Toxicity.

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Background. Preclinical data indicate that trabectedin followed by irinotecan has strong synergistic effects on Ewing sarcoma. This is presumably due to hypersensitization of the tumor cells to the camptothecin as an effect of trabectedin in addition to synergistic suppression of EWS-FLI1 downstream

Antitumour potential of a polysaccharide-rich substance from the fruit juice of Morinda citrifolia (Noni) on sarcoma 180 ascites tumour in mice.

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An immunomodulatory polysaccharide-rich substance (Noni-ppt) from the fruit juice of Morinda citrifolia has been found to possess both prophylactic and therapeutic potentials against the immunomodulator sensitive Sarcoma 180 tumour system. The antitumour activity of Noni-ppt produced a cure rate of

Activity of camptothecin, harringtonin, cantharidin and curcumae in the human tumor stem cell assay.

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The antitumor activity of four investigational natural products (camptothecin, harringtonin, cantharidin and curcumae) obtained from China were tested on human tumor biopsies in an in vitro soft agar clonogenic assay system. Significant antitumor activity was seen with camptothecin against human

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