Expression and Prognostic Significance of Macrophage Inflammatory Protein-3 Alpha and Cystatin A in Nasopharyngeal Carcinoma

This study aims to investigate the expression of macrophage inflammatory protein-3 alpha (MIP-3 alpha) and cystatin A in nasopharyngeal carcinoma (NPC) and their association with clinical characteristics and prognosis. Primary tumor specimens from 114 NPC patients and associated clinical follow-up data were collected, and the expression of MIP-3 alpha and cystatin A proteins was investigated by immunohistochemistry. Expression of MIP-3 alpha was significantly associated with TNM stage in patients with NPC (P < 0.05). NPC patients with positive expression of MIP-3 alpha exhibited shorter median overall survival (OS) and distant metastasis-free survival (DMFS), compared with patients with negative expression (OS: 50.5 months versus 59.0 months, P = 0.013; DMFS: 50.1 months versus 60.2 months, P = 0.003). NPC patients with positive expression of cystatin A exhibited shorter median OS, local recurrence-free survival (LRFS), and DMFS, compared with patients with negative expression (OS: 51.1 months versus 60.0 months, P = 0.004; LRFS: 54.5 months versus 59.5 months, P = 0.036; DMFS: 52.3 months versus 58.8 months, P = 0.036). Both MIP-3 alpha and cystatin A overexpressions in NPC tumor tissues were strong independent factors of poor prognosis in NPC patients. MIP-3 alpha and cystatin A expressions may be valuable prognostic markers in NPC patients.