Application of new silicone gel to sustained release dosage form of antitumor drug.

Drug design and delivery Pub Date : 1989-05-01
K Imasaka, H Ueda, T Azuma, T Kawaguchi, T Nagai
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Abstract

The object of this study was to develop a sustained release implantable dosage form of a new silicone gel (PHYCON 6600R) which undergoes addition polymerization to produce a solid gel at ordinary temperature. Implantable PHYCON-drug composites were studied as a means of tumor therapy using 3',5'-diesters of 5-fluoro-2'-deoxyuridine (FUdR-Cn) as a model for antitumor drugs. Using an in vitro dissolution test, we found that the release characteristics of drugs from these preparations could be controlled by the addition of powdered L-alanine. In vivo studies of antitumor activity were carried out, using preparations containing the dodecyl ester (FUdR-C12) by measuring the lifespan of lymphoma-inoculated mice. Antitumor activity, reflected in increased lifespan, was shown to be greater following intraperitoneal administration of the PHYCON formulations (drug and L-alanine) than following injections of the drug alone. Our results suggest that sustained release implantable formulations of antitumor drugs in PHYCON might be suitable for tumor chemotherapy.

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新型有机硅凝胶在抗肿瘤药物缓释剂型中的应用。
本研究的目的是开发一种新型硅凝胶(PHYCON 6600R)的缓释植入剂型,该剂型在常温下经过加成聚合生成固体凝胶。以5-氟-2'-脱氧尿苷(FUdR-Cn)的3',5'-二酯作为抗肿瘤药物模型,研究了可植入PHYCON-drug复合物作为肿瘤治疗手段。通过体外溶出试验,我们发现这些制剂的药物释放特性可以通过添加粉末l -丙氨酸来控制。使用含有十二烷基酯(FUdR-C12)的制剂,通过测量淋巴瘤接种小鼠的寿命,进行了体内抗肿瘤活性研究。通过延长寿命可以看出,腹腔注射PHYCON制剂(药物和l -丙氨酸)比单独注射PHYCON具有更强的抗肿瘤活性。我们的研究结果表明,PHYCON中抗肿瘤药物的缓释植入制剂可能适合肿瘤化疗。
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