Fig. 4. Clinical impact of chemotherapy and radiation therapy on R0/R1 patients. Tendency of chemotherapy to survival difference in (A) R0 patients (27 months vs. 19 months, P = 0.303) and (B) R1 patients (21 months vs. 13 months, P = 0.056). Radiation therapy had survival benefit on both (C) R0 (30 months vs. 25 months, P = 0.034) and (D) R1 patients (29 months vs. 16 months, P = 0.009).