To investigate the relationship between human papillomavirus (HPV) infection and concurrent esophagus and gastric cardia cancer from the same patient (CC) and examine the significance of P16(INK4A) protein expression.
Henan Key Laboratory for Esophageal Cancer Research, Department of Gastroenterology, The First Affiliated Hospital, College of Basic Medicine, Zhengzhou University, Zhengzhou 450052, Henan Province, China.