ENO2 and syphilis: Laboratory tests, including complete blood count, C-reactive protein, liver and kidney function assessments, thyroid hormones and related antibodies, autoimmune antibodies (ANA), vasculitis markers, screenings for HIV, syphilis, and tumor markers [neuron-specific enolase (NSE), cancer antigen 125 (CA125), CA199, CA153, alpha-fetoprotein (AFP), squamous cell carcinoma antigen (SCC), were all within normal ranges.