title: Short-term effects of subconjunctival injections of 5-fluorouracil on conjunctival epithelium.
abstract: OBJECTIVE
  To assess the changes in the conjunctival cytology of patients given a subconjunctival injection of 5-fluorouracil (5-FU) to treat failed filtering blebs.
  
  
  METHODS
  The patients were classified into 3 groups. The first group included 15 eyes in 15 patients who were given subconjunctival injections of 5-FU after unsuccessful glaucoma surgery. The second group consisted of 15 eyes of 15 patients with primary open angle glaucoma treated with antiglaucomatous eyedrops. Twelve healthy age- and sex-matched volunteers formed the third group. Impression cytology specimens were obtained from the bulbar conjunctiva just beside the injection sites using cellulose acetate filter paper. The samples were fixed in 95% ethanol, stained with Papanicolaou stain, and evaluated under light microscopy and graded.
  
  
  RESULTS
  In the first group, grade 0-3 cytological changes were seen in 1 eye (6.6%), 9 eyes (60%), 4 eyes (26.6%), and 1 eye (6.6%). Apoptosis was observed in 2 eyes (13%) and nuclear atypia in 7 eyes (47%). In the second group, 9 eyes (60%) were grade 0, 4 eyes (27%) were grade 1, and 2 eyes (13%) were grade 2. Also, nuclear atypia was observed in 1 eye (6.6%). In the third group, 10 eyes (83%) were grade 0 and 2 eyes (17%) were grade 1. There was no significant difference in terms of the impression cytology grades between the groups because of small sample size.
  
  
  CONCLUSIONS
  The use of subconjunctival 5-FU injections after glaucoma surgery may lead to squamous metaplastic changes and nuclear atypia and apoptotic cell death in the conjunctival epithelium in short-term period.
authors.affiliation: Ulucanlar Education and Research Eye Hospital, Glaucoma Unit, Ankara, Turkey. tulaysimsek@hotmail.com
authors.forename: Tulay
authors.initials: T
authors.lastname: Simsek
authors.forename: Pinar
authors.initials: P
authors.lastname: Firat
authors.forename: Mehmet
authors.initials: M
authors.lastname: Citirik
authors.forename: Yasemin
authors.initials: Y
authors.lastname: Ozdamar
authors.forename: Ufuk
authors.initials: U
authors.lastname: Elgin
mesh_terms: D000328:Adult; D000368:Aged; D000963:Antimetabolites / Q000008:administration & dosage*; D017209:Apoptosis / Q000187:drug effects*; D003228:Conjunctiva / Q000187:drug effects* / Q000473:pathology*; D004848:Epithelium / Q000187:drug effects; D005260:Female; D005472:Fluorouracil / Q000008:administration & dosage*; D005902:Glaucoma, Open-Angle / Q000188:drug therapy / Q000601:surgery; D006801:Humans; D007267:Injections; D008297:Male; D008679:Metaplasia; D008875:Middle Aged; D014129:Trabecular Meshwork; D014130:Trabeculectomy
chemical_list: D000963:Antimetabolites; D005472:Fluorouracil