Langerhans Cell Histiocytosis: Single Center Experience of 25 Years.

Objectives: To review a single center outcome of patients with Langerhans Cell Histiocytosis diagnosed at a tertiary referral hospital from Turkey.Methods: The files between 1989 and 2015 of 80 patients with LCH were retrospectively analyzed.
Results: During the 25 years, 80 patients were diagnosed with LCH. The median age at diagnosis was 53 months (2-180 months) and the median follow-up time of patients was 10 years and 9 months (24 months-25 years). Bone was the most frequently affected organ (n:60, 75%). Initially, 43 patients (54%) had single system (SS) disease, 20 patients (25%) had multisystem (MS) disease without risk organ involvement (MS-RO ^- ), and 17 patients (21%) had a multisystem disease with risk-organ involvement (MS-RO ⁺ ). The overall survival (OS) rate was 91%, and event-free survival (EFS) rate was 67% at 10 years. 10-year OS rate was lower for patients with MS-RO ⁺ (65%) when compared to those with, MS-RO ^- , and SS (100%, 97%, p value=<0.001). The overall survival rate was also lower in patients with lack of response to systemic chemotherapy on 12th week (p=<0.001), younger age (<2 years) at presentation (p=<0.02), skin involvement (<0.001) and lack of bone lesions at presentation (<0.001).
Discussion: In the group with MS-RO ⁺ , OS is significantly low compared to other groups. Further efforts are warranted to improve survival in MS-RO ⁺ patients.
Competing Interests: Competing interests: The authors have declared that no competing interests exist.