ALDH1B1 predicts poor survival for locally advanced nasopharyngeal carcinoma patients.

Background: Distant metastasis and local recurrence remain the major reasons of treatment failure in locally advanced nasopharyngeal carcinoma (NPC). Therefore, exploring novel biomarkers for prognosis and sensitivity of radiotherapy in locally advanced NPC is crucial. This retrospective study evaluates the expression and prognostic value of aldehyde dehydrogenase 1B1 (ALDH1B1) for locally advanced NPC patients. Methods: Sixty-seven locally advanced NPC patients and 22 chronic nasopharyngitis patients between September 2012 to November 2016 at The First Affiliated Hospital of University of South China were enrolled in this study. The expression of ALDH1B1 in tumor tissues were detected by using immunohistochemistry (IHC). Results: Significant difference was observed between NPC groups and Pharyngitis tissues groups, and NPC groups has a higher ratio of high ALDH1B1 expression. ALDH1B1 expression were significantly associated with age and radiotherapy response. The Kaplan-Meier analysis indicated that patients with high ALDH1B1 expression had a poor prognosis both in overall survival (OS) and progression-free survival (PFS). Univariate analysis found that age, radiotherapy response and ALDH1B1 expression were correlated with OS. Besides, factors affecting PFS are radiotherapy response and ALDH1B1 expression. Multivariate analysis revealed that radiotherapy response and ALDH1B1 expression were the independent prognostic factors for OS, whereas radiotherapy response was for PFS. Conclusions: The expression of ALDH1B1 was correlated with age and radiotherapy response. Patients with high ALDH1B1 expression show a poor prognosis both in OS and DFS. ALDH1B1 expression were the independent prognostic factors for OS.