Gender-specific association of uric acid and survival in sporadic amyotrophic lateral sclerosis patients.

OBJECTIVE: To investigate the relationship between serum uric acid (UA) and survival in sporadic amyotrophic lateral sclerosis (sALS) patients. METHOD: A total of 801 sporadic amyotrophic lateral sclerosis (sALS) patients fulfilled the revised El Escorial criteria were enrolled and followed up in the study. Baseline clinical data and laboratory variables including gender, age, age of onset, site of onset, disease duration, body mass index (BMI), uric acid (UA), creatinine (Cr), and creatine kinase (CK) were collected during enrollment. Multivariate Cox regression models were used to evaluate the survival-related factors after adjustment for confounders. RESULTS: The serum UA level was significantly lower in female patients than that in male patients (243.5 vs 314.9 µmol/L, p < 0.001). Gender, BMI, Cr, CK were significantly associated with the level of uric acid according to the linear regression analysis. In the multivariate Cox regression analysis, higher serum UA level (>268.0 µmol/L) was an independent protective factor for prolonged survival among female patients (HR = 0.69, P = 0.042) after adjustment for confounders. CONCLUSION: The present study provided further support that higher UA was a protective factor for survival in sALS patients, especially in female.