作者单位:Columbia Univ Coll Phys & Surg, Div Digest & Liver Dis, 1130 St Nicholas Ave, New York, NY 10032 USA[1]Dana Farber Canc Inst, Dept Med Oncol, 450 Brookline Ave, Boston, MA 02215 USA[2]Columbia Univ Coll Phys & Surg, Dept Pathol, Div Clin Pathol & Cell Biol, 630 W 168th St, New York[3]