Vitamin D Deficiency and Oral Mucositis in Hematopoietic Stem Cell Transplantation: A Cross-Sectional Observation

Backgrounds: One of the most frequent complications of high-dose chemotherapy regimen before hematopoietic stem cell transplantation (HSCT) is oral mucositis (OM). Vitamin D (VD) has well-known immunoregulatory, anti-inflammatory, and antioxidant properties. Objectives: This study aimed to evaluate the association of baseline VD levels with OM as well as neutrophil and platelet engraftments in patients with multiple myeloma, Hodgkin’s and non-Hodgkin’s lymphoma after autologous HSCT. Methods: A sample of 71 patients was included after obtaining informed consent. Serum samples were collected in the morning prior to the administration of conditioning regimen to measure the baseline 25-OH-D. OM was examined daily during hospital stay. The WHO scale was used for scoring the OM. Absolute neutrophil count and platelet count were determined daily from transplantation until engraftment. Results: Patients aged between 18 to 65 years. Mean length of hospital stay was 15.8±5.7 days. OM was detected in 44/71 (62.0%) of patients. Mean time to the engraftment of neutrophils and platelets were 11.8±4.0 and 17.2±7.3 days, respectively. Mean level of baseline 25-OH-D was 17.5±14.0 ng/ml. VD deficiency (