Evaluation of Tranilast to Treat Pterygium Before Excision

Summary

Recurrent or secondary pterygium often has often a growing fibrovascular tissue more exuberant than the primary. Histological findings differ from the primary, since the typical changes in the degenerate connective tissue are absent. The strong immunoreactivity and release of basic fibroblast growth (b-FGF) in cultured fibroblasts of recurrent pterygia suggest that fibroblasts may play an important role in pterygium recurrence. Tranilast used is an antiallergic drug that has an inhibitory effect on the release of chemical transmitters, such as histamine and leukotrienes from mast cells as well as a suppressive effect on vascular permeability.This drug also reduces TGF-β1 production and collagen synthesis in various cells. Tranilast might reduce pterygium recurrence by suppressing TGF-β1 synthesis in conjunctival fibroblast after pterygium surgery. The investigators want to confirm these findings and also compare the recurrence rate between the two types of surgery. Tranilast might be an alternative of mitomycin use, and also less toxic. This study aim to compare the effectiveness of preventing recurrence by using tranilast by topical subconjunctival administration previous to conjunctival autograft transplantation surgery in cases of primary pterygium, and will be perform clinical evaluation and TGF-beta-1 immunohistochemical detection by the anti-TGF-beta 1 antibody as well as fibroblast culture.

Timeline

Start

2009-02

Primary completion

2011-07

Completion

2012-03

Publications

• Results Wang M, Zhang JJ, Jackson TL, Sun X, Wu W, Marshall J. Safety and efficacy of intracapsular tranilast microspheres in experimental posterior capsule opacification. J Cataract Refract Surg. 2007 Dec;33(12):2122-8. doi: 10.1016/j.jcrs.2007.07.041.
• Results Ji CN, Hu YZ, Ding ZP, Li GG. [The investigation of tranilast on the proliferation and migration of human Tenon's capsule fibroblasts]. Zhonghua Yan Ke Za Zhi. 2004 Mar;40(3):165-9. Chinese.
• Results Yasukawa T, Kimura H, Dong J, Tabata Y, Miyamoto H, Honda Y, Ogura Y. Effect of tranilast on proliferation, collagen gel contraction, and transforming growth factor beta secretion of retinal pigment epithelial cells and fibroblasts. Ophthalmic Res. 2002 Jul-Aug;34(4):206-12. doi: 10.1159/000063884.
• Almeida Junior GC, Arakawa L, Santi Neto Dd, Cury PM, Lima Filho AA, Sousa SJ, Alves MR, Azoubel R. Preoperative tranilast as adjunctive therapy to primary pterygium surgery with a 1-year follow-up. Arq Bras Oftalmol. 2015 Jan-Feb;78(1):1-5. doi: 10.5935/0004-2749.20150002.

Drugs

Indications