title: Transdermal patches for site-specific delivery of anastrozole: In vitro and local tissue disposition evaluation.
abstract: Anastrozole is a potent aromatase inhibitor and there is a need for an alternative to the oral method of administration to target cancer tissues. The purpose of the current study was to prepare a drug-in-adhesive transdermal patch for anastrozole and evaluate this for the site-specific delivery of anastrozole. Different adhesive matrixes, permeation enhancers and amounts of anastrozole were investigated for promoting the passage of anastrozole through the skin of rats in vitro. The best in vitro skin permeation profile was obtained with the formulation containing DURO-TAK 87-4098, IPM 8% and anastrozole 8%. For local tissue disposition studies, the anastrozole patch was applied to mouse abdominal skin, and blood, skin, and muscle samples were taken at different times after removing the residual adhesive from the skin. High accumulation of the drug in the skin and muscle tissue beneath the patch application site was observed in mice compared with that after oral administration. These findings show that anastrozole transdermal patches are an appropriate delivery system for application to the breast tumor region for site-specific drug delivery to obtain a high local drug concentration.
authors.affiliation: Department of Pharmaceutical Sciences, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, Liaoning 110016, China.
authors.forename: Honglei
authors.initials: H
authors.lastname: Xi
authors.forename: Yonggang
authors.initials: Y
authors.lastname: Yang
authors.forename: Dongmei
authors.initials: D
authors.lastname: Zhao
authors.forename: Liang
authors.initials: L
authors.lastname: Fang
authors.forename: Lin
authors.initials: L
authors.lastname: Sun
authors.forename: Liwei
authors.initials: L
authors.lastname: Mu
authors.forename: Jie
authors.initials: J
authors.lastname: Liu
authors.forename: Nanxi
authors.initials: N
authors.lastname: Zhao
authors.forename: Yanyan
authors.initials: Y
authors.lastname: Zhao
authors.forename: Ni
authors.initials: N
authors.lastname: Zheng
authors.forename: Zhonggui
authors.initials: Z
authors.lastname: He
mesh_terms: D000269:Adhesives / Q000493:pharmacokinetics*; D000279:Administration, Cutaneous; D000284:Administration, Oral; D000077384:Anastrozole; D000818:Animals; D002626:Chemistry, Pharmaceutical / Q000379:methods*; D004337:Drug Carriers / Q000493:pharmacokinetics*; D016503:Drug Delivery Systems / Q000379:methods*; D005260:Female; D051379:Mice; D008815:Mice, Inbred Strains; D009570:Nitriles / Q000008:administration & dosage* / Q000493:pharmacokinetics*; D010539:Permeability; D051381:Rats; D017208:Rats, Wistar; D012867:Skin / Q000378:metabolism; D012869:Skin Absorption; D014018:Tissue Distribution; D014230:Triazoles / Q000008:administration & dosage* / Q000493:pharmacokinetics*
chemical_list: D000269:Adhesives; D004337:Drug Carriers; D009570:Nitriles; D014230:Triazoles; D000077384:Anastrozole