Serum anti-p53 antibodies as a diagnostic tumor marker: observations in patients with malignant and premalignant oral cavity lesions.

AIM: To determine whether serum anti-p53 antibody (p53-Abs) positivity in patients with oral carcinoma corresponds with tumor localization, histological grade, stage, and recurrence. METHODS: The study population was divided into three groups: controls; patients with a premalignant lesion; and patients with oral squamous cell carcinoma (SCC). The third group was composed of patients attending outpatient services for pathological diagnosis or for follow-up monitoring only. The cancer patients had undergone resective surgery in local anesthesia. Serum p53-Abs levels were measured using a commercial enzyme-linked immunosorbent assay (ELISA) and monitored over a 3-year follow-up period. RESULTS: Controls and patients with premalignant lesions did not test positive for p53-Abs at ELISA testing. Patients with a malignant lesion tested positive at initial diagnosis when a high histopathological grade lesion was present or localized to the posterior region of the oral cavity. Postoperative serum p53-Abs levels gradually declined until complete seronegativity. Patients with a recurrent tumor tested positive for p53-Abs. CONCLUSION: Seropositivity for p53-Abs may be associated with histopathological tumor grade, localization, and recurrence. The findings suggest that serum p53-Abs analysis is a useful diagnostic marker for oral SCC.