[Expression of HPV16-E6 and E7 oncoproteins in squamous cell carcinoma tissues of esophageal cancer and non-cancer tissues].

Background & Objective: Evidences indicate that high-risk type human papillomavirus (HPV) are closely associated with the carcinogenesis, progression and transformation of several kinds of human tumors. This study was designed to determine the expression of HPV16- E6 and E7 oncoproteins in normal tissues, dysplasia tissues, and carcinoma tissues of patients with esophageal cancer and to investigate the biological significance of high-risk type HPV in the esophageal squamous cell carcinogenesis.

Methods: HPV16-E6 and E7 oncoproteins were determined using immunohistochemical staining in normal mucosa tissues (70 cases), dysplasia tissues (43 cases), and carcinoma tissues (18 cases).

Results: The positive rates of HPV16-E6 in the tissues of normal mucosa, dysplasia, and carcinoma of esophagus patients were 59.3%,88.4%,and 83.3%,respectively; the positive rates of HPV16-E7 protein were 62.1%, 90.7%, and 88.9%, respectively. The positive rates of HPV16-E6 and E7 in dysplasia and carcinoma of esophagus were significantly higher than those in normal mucosa (P< 0.05). Double expression of HPV16-E6 and E7 in normal mucosa was 25.7%, while in dysplasia and carcinoma were 88.3% and 83.3%,respectively.

Conclusion: HPV16-E6 and E7 are highly associated with esophageal squamous cell carcinogenesis. And cooperation of HPV16-E6 and E7 may play an important role in genesis of esophageal squamous carcinoma.