Carcinoma, Squamous Cell

• Department of GI Oncology, Peking University Cancer Hospital, — Beijing, Beijing Municipality, China

• Jiangsu Provincial Cancer Hospital — Nanjing, Jiangsu, China

• Changhai hosipital — Shanghai, Shanghai Municipality, China

• Shandong Cancer Hospital and Institute, Shandong First Medical University and Shandong Academy of Medical Sciences — Jinan, Shandong, China

• Cancer Hospital, Chinese Academy of Medical Sciences/Peking Union Medical College — Beijing, Chaoyang, China

• Zhejiang Cancer Hospital — Hangzhou, Zhejiang, China

• The First Affiliated Hospital of Nanjing Medical University — Nanjing, China

• The Tenth Affiliated Hospital of Southern Medical University (Dongguan People's Hospital) — Dongguan, Guangdong, China

• National Institutes of Health Clinical Center — Bethesda, Maryland, United States

Not specified