Evaluation of Safety & Efficacy for the Prevention of Ocular GVHD With Ophthalmic Tacrolimus vs Cyclosporine in Allo-HSCT

After being informed about the study and potential risks, all patients giving written informed consent will be assigned a participant number to anonymize their data and collect information, including age, sex, diagnosis, stage of disease, type of procedure, and conditioning chemotherapy. Additionally, an ophthalmology evaluation will be conducted in the Ophthalmology Department of the University Hospital of the U.A.N.L. by the study team of ophthalmologists, following a standardized method and using a worksheet for dry eye and ocular surface evaluation. Participants will be randomized to receive either treatment arm A (cyclosporine eye drops) or treatment arm B (tacrolimus ointment) through a stratified method. After the hematopoietic stem cell transplant (HSCT), information will be collected, such as the transplant details (e.g., number of cluster of differentiation 34 [CD34] cells infused, cell source, and any complications during the procedure) and medications used for the systemic GVHD prophylaxis, as well as the graft date. In addition to the standard systemic management protocol for GVHD prevention of the transplant program of the Hematology Service of the Hospital University U.A.N.L. cyclosporine or tacrolimus will be administered to participants once grafting is demonstrated, defined as the presence in the blood count of a neutrophil count that is equal to or greater than to 500/mm3 and platelet count equal to or greater than 20,000/mm3. - Treatment arm A: topical cyclosporine 0.1% ocular drops, twice daily, one drop in each eye, with a 12-hour difference between each dose, for 12 continuous months. The commercial presentation that we will use has the following formula: Each milliliter of 0.1% solution contains Cyclosporine A 10 mg, c.b.p 1.0 ml. - Treatment arm B: tacrolimus ointment, to be applied approximately 1cm or the amount to cover the lower fornix twice a day in each eye, with a difference of 12 hours between each dose, for 12 continuous months. The presentation of the medicine in ointment has a 10 gr tube with 0.03% drug. Ophthalmological evaluations will be carried out at the initial visit (before the bone marrow transplant) and scheduled subsequent visits: at the time of transplant graft (variable depending on the type of transplant, between days +10 and +21 approximately), and 3, 6, 9, and 12 months from the start of treatment (day of graft). Also, they will be evaluated during all follow-up visits to the transplant department of the Hematology Service, assessing adherence and tolerance to the medication through direct questioning. The severity of ocular GVHD will be established based on the NIH criteria and the severity criteria of the international consensus on the severity of chronic ocular GVHD (ICCGVHD) Ophthalmological variables to be evaluated - Tear breakup time, Schirmer's test, esthesiometry, Keratograph 5M Topographer Dry Eye Assessment, upper and lower tarsus Meibomian Gland imaging (Keratograph 5M), tear osmolarity, metalloproteinase 9 levels in tears. - Corneal and conjunctival staining measured with the Oxford Scale and the Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Scale and SICCA Ocular Staining Score (OSS).