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Currently, you can access the following clinical trials being conducted worldwide:
Clinicaltrials.gov identifier NCT03943797
Recruitment Status Recruiting
First Posted May 9, 2019
Last update posted August 13, 2020
Earlier protocol for cultivated oral mucosal epithelial transplantation (COMET) requires trypsin/EDTA to isolate epithelial cells from tissue, and uses murine 3T3 cells as feeder cells, which results in biosafety concern. This study uses collagenase instead of trypsin/EDTA to isolate epithelial cells, and does not use 3T3 cells co-culture, so as to make an animal ingredient-free cell culture product. The purpose of the study is to evaluate the feasibility of the new protocol of COMET in clinical use.
When corneal epithelial stem cells are destroyed by severe trauma such as burn or autoimmune diseases, poor regeneration of corneal epithelium, persistent inflammatory reaction, neovascular ingrowth, and conjunctivalization may ensue, and seriously reduce the vision. In treating the diseased eye, when the other eye is healthy, limbal tissue containing corneal epithelial stem cells can be harvested for direct tissue transplantation, or ex vivo cultivation and expansion for several days before transplantation. For patients with bilaterally damaged eyes, rejection rate in non-HLA matched allograft limbal stem cell transplantation is very high, in addition, adverse reaction to long-term immunosuppressive therapy may be life-threatening. Therefore, in 2004 Japanese researchers first proposed a novel technique to treat ocular surface diseases using cultivated autologous oral mucosal epithelial transplantation (COMET). From 2006 to 2009, investigators have also conducted a Phase I clinical trial approved by Taiwan FDA. In that Phase I trial, investigators have demonstrated efficacy of such cell therapy in promoting wound healing in patients with severe ocular surface burns (Ma DHK et al. Eye 2009; 23: 1442- 1450). Investigators have also identify long-term persistence of transplanted oral mucosal epithelial cells in the cornea (Chen HCJ et al. IOVS 2009;50:4660-4668), justifying this innovative surgical procedure as an effective alternative treatment modality. However, in previous protocol, animal products such as fetal calf serum and 3T3 cell culture were used, raising the biosafety concern. For this, recently investigators have developed an animal ingredient-free cell culture protocol, and our protocol can meet the GTP standards, and has obtained the accreditation by Taiwan FDA and affiliated institutes. Therefore, the focus of current Phase Ib trial is to confirm the feasibility and safety of following items: 1. To produce cell culture product not containing animal ingredient, so as to avoid zoonoses. The oral mucosal epithelial cells thus cultured are used for treating ocular surface diseases with limbal stem cell deficiency. 2. To reduce recurrence of corneal neovascularization after COMET, Bevacizumab (Avastin) is injected locally, so as to improve corneal transparency and visual acuity.
|Experimental: Cultivated oral mucosal epithelial cell transplantation
Cell therapy for treating severe limbal stem cell deficiency using cultivated autologous oral mucosal epithelial cells.
Biological: Cultivated oral mucosal epithelial cell transplantation
Cultivated oral mucosal epithelial cell transplantation (COMET) will be used to treat severe limbal stem cell deficiency so as to restore the integrity of corneal surface
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, , Learn About Clinical Studies.-->
- Severe corneal epithelial deficiency
- Having favorable prognosis potential
- Normal of the intraocular pressure
- Normal of the light perception for the optic nerve
- No retinal diseases for the inflicted eyes
- No severe dry eye
- Having unfavorable prognosis potential
- Severe systemic disorders
- Unable to use daily vision
- Mentally retarded to execute permit on surgery
- Pregnant woman
Contact: David Hui-Kang Ma, MD, PhD 03-328-1200 ext 7840 firstname.lastname@example.org
Contact: Zheng Hua Huang, MSc 03-328-1200 ext 7840 email@example.com
Core Laboratory for Cell Therapy, Veterans General Hospital
Chang Gung Memorial Hospital
Principal Investigator: David Hui-Kang Ma, MD, PhD Chang Gung Memorial Hospital
Chen HC, Chen HL, Lai JY, Chen CC, Tsai YJ, Kuo MT, Chu PH, Sun CC, Chen JK, Ma DH. Persistence of transplanted oral mucosal epithelial cells in human cornea. Invest Ophthalmol Vis Sci. 2009 Oct;50(10):4660-8. doi: 10.1167/iovs.09-3377. Epub 2009 May 20.
Chen HC, Yeh LK, Tsai YJ, Lai CH, Chen CC, Lai JY, Sun CC, Chang G, Hwang TL, Chen JK, Ma DH. Expression of angiogenesis-related factors in human corneas after cultivated oral mucosal epithelial transplantation. Invest Ophthalmol Vis Sci. 2012 Aug 17;53(9):5615-23. doi: 10.1167/iovs.11-9293.
Inatomi T, Nakamura T, Koizumi N, Sotozono C, Yokoi N, Kinoshita S. Midterm results on ocular surface reconstruction using cultivated autologous oral mucosal epithelial transplantation. Am J Ophthalmol. 2006 Feb;141(2):267-275.
Inatomi T, Nakamura T, Kojyo M, Koizumi N, Sotozono C, Kinoshita S. Ocular surface reconstruction with combination of cultivated autologous oral mucosal epithelial transplantation and penetrating keratoplasty. Am J Ophthalmol. 2006 Nov;142(5):757-64. Epub 2006 Sep 20.
Li W, Sabater AL, Chen YT, Hayashida Y, Chen SY, He H, Tseng SC. A novel method of isolation, preservation, and expansion of human corneal endothelial cells. Invest Ophthalmol Vis Sci. 2007 Feb;48(2):614-20.
Ma DH, Kuo MT, Tsai YJ, Chen HC, Chen XL, Wang SF, Li L, Hsiao CH, Lin KK. Transplantation of cultivated oral mucosal epithelial cells for severe corneal burn. Eye (Lond). 2009 Jun;23(6):1442-50. doi: 10.1038/eye.2009.60. Epub 2009 Apr 17.
Nakamura T, Inatomi T, Sotozono C, Amemiya T, Kanamura N, Kinoshita S. Transplantation of cultivated autologous oral mucosal epithelial cells in patients with severe ocular surface disorders. Br J Ophthalmol. 2004 Oct;88(10):1280-4.
Nakamura T, Takeda K, Inatomi T, Sotozono C, Kinoshita S. Long-term results of autologous cultivated oral mucosal epithelial transplantation in the scar phase of severe ocular surface disorders. Br J Ophthalmol. 2011 Jul;95(7):942-6. doi: 10.1136/bjo.2010.188714. Epub 2010 Nov 19.
Petsoglou C, Balaggan KS, Dart JK, Bunce C, Xing W, Ali RR, Tuft SJ. Subconjunctival bevacizumab induces regression of corneal neovascularisation: a pilot randomised placebo-controlled double-masked trial. Br J Ophthalmol. 2013 Jan;97(1):28-32. doi: 10.1136/bjophthalmol-2012-302137. Epub 2012 Oct 20.
Satake Y, Higa K, Tsubota K, Shimazaki J. Long-term outcome of cultivated oral mucosal epithelial sheet transplantation in treatment of total limbal stem cell deficiency. Ophthalmology. 2011 Aug;118(8):1524-30. doi: 10.1016/j.ophtha.2011.01.039. Epub 2011 May 14.
Takeda K, Nakamura T, Inatomi T, Sotozono C, Watanabe A, Kinoshita S. Ocular surface reconstruction using the combination of autologous cultivated oral mucosal epithelial transplantation and eyelid surgery for severe ocular surface disease. Am J Ophthalmol. 2011 Aug;152(2):195-201.e1. doi: 10.1016/j.ajo.2011.01.046. Epub 2011 Jun 8.
Hsueh YJ, Huang SF, Lai JY, Ma SC, Chen HC, Wu SE, Wang TK, Sun CC, Ma KS, Chen JK, Lai CH, Ma DH. Preservation of epithelial progenitor cells from collagenase-digested oral mucosa during ex vivo cultivation. Sci Rep. 2016 Nov 8;6:36266. doi: 10.1038/srep36266.