The long term outcome of limbal allografts: the search for surviving cells

dc.contributor.authorHenderson, Timothy R
dc.contributor.authorCoster, Douglas John
dc.contributor.authorWilliams, Keryn Anne
dc.description.abstractBACKGROUND/AIMS: Limbal allotransplantation is increasingly being used for ocular surface repair in patients with limbal stem cell dysfunction. However, it is uncertain whether donor cells survive long term on the ocular surface and whether patients maintain the early benefits of the procedure. The aims of this study were to investigate the long term outcome of clinical limbal allografts and to correlate outcome with donor cell survival. METHODS: Five patients who had undergone allotransplantation-four keratolimbal allografts and one tarsoconjunctival allograft-from 3-5 years previously, and for whom residual frozen donor ocular tissue was available, were reviewed. Survival of donor cells lifted from the recipient ocular surface by impression cytology was investigated by DNA fingerprinting using primers detecting variable nucleotide tandem repeat sequences. Recipient buccal cells and scleral samples from the remnant donor eye were used to genotype recipients and donors, respectively. Polymerase chain reaction products were sized by Genescan analysis. RESULTS: An objective long term benefit from the procedure (improved Snellen acuity, reduced frequency of epithelial defects, reduced vascularisation, and scarring) was recorded for four patients. Some subjective benefit was also reported. However, in no instances were donor cells recovered from the ocular surface at 3-5 years post-graft. Initial experiments to examine sensitivity indicated that any surviving donor cells must have constituted less than 2.5% of cells sampled. CONCLUSION: Limbal stem cell allotransplantation can provide long term benefits, as measured by objective criteria. However, such benefits do not necessarily correlate with survival of measurable numbers of donor cells on the ocular surface.en
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dc.identifier.citationTR Henderson, DJ Coster and KA Williams 2001. The long term outcome of limbal allografts: the search for surviving cells. 'British Journal of Ophthalmology', May, Vol 85, No 5, 604-9en
dc.oaire.license.condition.licenseIn Copyright
dc.publisherBMJ Publishing Group -
dc.subjectCorneal Transplantationen
dc.subjectDNA Fingerprintingen
dc.subjectGraft Survivalen
dc.subjectLimbus Corneaeen
dc.subjectPolymerase Chain Reactionen
dc.subjectStem Cell Transplantationen
dc.subjectTandem Repeat Sequencesen
dc.subjectVisual Acuityen
dc.subject.otherAustralian Standard Research Classification 321016 Ophthalmology and Vision Scienceen
dc.titleThe long term outcome of limbal allografts: the search for surviving cellsen
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