主要目的：评价DF203在晚期实体瘤患者中的安全性及耐受性，并确定最大耐受剂量（MTD）以及Ⅱ期推荐给药剂量（RPⅡD）次要目的：评价DF203在晚期实体瘤患者中的药代动力学（PK）特征；评价DF203在晚期实体瘤患者中的初步抗肿瘤疗效。探索性目的：基于外周血中特异性免疫细胞因子和特异性T细胞以及肿瘤组织中特异性T细胞和基因组的相关变化，评估DF203在晚期实体瘤患者中的药效动力学（PD）特征。

开始日期2021-04-02

申办/合作机构

苏州丁孚靶点生物技术有限公司

100 项与重组抗人EGFR抗体/IL-10双特异Fc融合蛋白(苏州丁孚靶点生物技术有限公司) 相关的临床结果

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100 项与重组抗人EGFR抗体/IL-10双特异Fc融合蛋白(苏州丁孚靶点生物技术有限公司) 相关的转化医学

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100 项与重组抗人EGFR抗体/IL-10双特异Fc融合蛋白(苏州丁孚靶点生物技术有限公司) 相关的专利（医药）

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项与重组抗人EGFR抗体/IL-10双特异Fc融合蛋白(苏州丁孚靶点生物技术有限公司) 相关的文献（医药）

2008-07-01·Breast Cancer Research and Treatment2区 · 医学

Mechanisms of acquired resistance to 2-(4-Amino-3-methylphenyl)benzothiazole in breast cancer cell lines

2区 · 医学

Article

作者: Tracey D. Bradshaw ; Robert te Poele ; Malcolm F. G. Stevens ; Erica L. Stone ; Valentina Trapani ; Charles S. Matthews ; Chee-Onn Leong

Compounds within the 2-(4-aminophenyl)benzothiazole class represent extremely potent and selective experimental antitumour agents. The lysylamide prodrug of 2-(4-amino-3-methylphenyl)-5-fluorobenzothiazole is undergoing phase I clinical evaluation. Extensive studies to elucidate mechanisms underlying the stark selectivity demonstrated potent cytosolic AhR ligand binding and cytochrome P450 1A1-catalysed bioactivation. Two human derived breast cell lines, initially exquisitely sensitive to this class of agent (GI50 < 5 nM) have been derived displaying acquired resistance to 2-(4-amino-3-methylphenyl)benzothiazole (DF 203; GI50 > 50 microM). Cross resistance to 2-(4-amino-3-iodophenyl)benzothiazole and 2-(4-amino-3-cyanophenyl)benzothiazole is observed (GI50 > 30 microM) as is > 100-fold reduced sensitivity of the two variant lines to 2-(4-amino-3-methylphenyl)-5-fluorobenzothiazole (5F 203). In contrast, cell lines possessing acquired resistance to DF 203 (203R) retain sensitivity to benzo[a]pyrene and doxorubicin. Examination of DF 203-treated cells by confocal microscopy and HPLC analyses of nutrient media concur revealing diminished depletion of DF 203 from medium and impaired intracellular DF 203 retention. In contrast to cytosolic arylhydrocarbon (AhR) receptors of wild type cells, AhR appears constitutively localised within nuclei of 203R cells; consequently, DF 203 fails to drive transcription of cyp1a1. DF 203- and 5F 203-derived DNA adducts fall significantly in 203R cells. Reduced number and intensity of gamma H2AX foci report protection against DF 203-evoked DNA double strand breaks. In conclusion, aberrant AhR signalling underlies at least in part acquired resistance to DF 203. Intriguingly, comparisons of gene transcription profiles between sensitive and resistant paired lines reveal > 5-fold up-regulation of cyp1b1 expression, a protein implicated in resistance to therapeutic agents.

2004-12-01·Drug Metabolism and Disposition2区 · 医学

FLUORINATED 2-(4-AMINO-3-METHYLPHENYL)BENZOTHIAZOLES INDUCE CYP1A1 EXPRESSION, BECOME METABOLIZED, AND BIND TO MACROMOLECULES IN SENSITIVE HUMAN CANCER CELLS

2区 · 医学

Article

作者: Bradshaw, Tracey D. ; Stevens, Malcolm F. G. ; Brantley, Eileen ; Hose, Curtis D. ; Alley, Michael C. ; Stinson, Sherman F. ; Sausville, Edward A. ; Trapani, Valentina

Fluorinated 2-(4-amino-3-methylphenyl)benzothiazoles possess potent antiproliferative activity against certain cancer cells, similar to the unfluorinated 2-(4-amino-3-methylphenyl)benzothiazole (DF 203, NSC 674495). In "sensitive" cancer cells, DF 203 is metabolized by, can induce expression of, and binds covalently to CYP1A1. Metabolism appears to be essential for its antiproliferative activity through DNA adduct formation. However, a biphasic dose-response relationship compromises its straightforward development as a chemotherapeutic agent. We investigated whether fluorinated benzothiazoles inhibit cancer cell growth without the biphasic dose-response, and whether the fluorinated benzothiazoles are also metabolized into reactive species, with binding to macromolecules in sensitive cancer cells. One fluorinated benzothiazole, 2-(4-amino-methylphenyl)-5-fluorobenzothiazole (5F 203, NSC 703786) did exhibit potent, antiproliferative activity without a biphasic dose-response. The fluorinated benzothiazoles were also metabolized only in cells, which subsequently showed evidence of cell death. We used microsomes from genetically engineered human B-lymphoblastoid cells expressing cytochromes P450 (CYP1A1, CYP1A2, or CYP1B1) to clarify the basis for fluorinated benzothiazole metabolism. 5F 203 induced CYP1A1 and CYP1B1 mRNA expression in sensitive breast and renal cancer cells, whereas 5F 203 induced CYP1A1 mRNA but not CYP1B1 mRNA expression in sensitive ovarian cancer cells. 5F 203 did not induce CYP1A1 or CYP1B1 mRNA expression in any "resistant" cancer cells. The fluorinated benzothiazoles induced CYP1A1 protein expression exclusively in sensitive cells. [14C]5F 203 bound substantially to subcellular fractions in sensitive cells but only minimally in resistant cells. These data are concordant with the antiproliferative activity of fluorinated benzothiazoles deriving from their ability to become metabolized and bind to macromolecules within sensitive cells.

2004-04-01·Current Medicinal Chemistry2区 · 医学

The Development of the Antitumour Benzothiazole Prodrug, Phortress, as a Clinical Candidate

2区 · 医学

Review

作者: T D Bradshaw ; A D Westwell

This review traces the development of a series of potent and selective antitumour benzothiazoles from the discovery of the initial lead compound, 2-(4-amino-3-methylphenyl)benzothiazole (DF 203) in 1995 to the identification of a clinical candidate, Phortress, scheduled to enter Phase 1 trials in Q1 2004 under the auspices of Cancer Research U.K. Advances in our understanding of the mechanism of action of this unique series of agents are described and can be summarised as follows: selective uptake into sensitive cells followed by Arylhydrocarbon Receptor (AhR) binding and translocation into the nucleus, induction of the cytochrome P450 isoform (CYP) 1A1, conversion of the drug into an electrophilic reactive intermediate and formation of extensive DNA adducts resulting in cell death. Our understanding of this mechanistic scenario has played a crucial role in the drug development process, most notably in the synthesis of fluorinated DF 203 analogues to thwart deactivating oxidative metabolism (5F 203) and water-soluble prodrug design for parenteral administration. Aspects of mechanism of action studies, in vitro and in vivo screening, synthetic chemistry and pharmacokinetics are reviewed here.

100 项与重组抗人EGFR抗体/IL-10双特异Fc融合蛋白(苏州丁孚靶点生物技术有限公司) 相关的药物交易

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