0 *P values were calculated with the use of Fisher’s Selleck YAP-TEAD Inhibitor 1 exact probability test. Figure 2 Occurrence of Peripheral Neuropathy in younger patients (left) and elderly patients (right). Abbreviation: G, Grade. Duration of Treatment The time to treatment failure (TTF) was 6.2 months in the younger group, and 4.9 months in the elderly group, being slightly shorter in the latter group (Figure 3). The major reasons for discontinuation of treatment were tumor progression in 2 patients (14.3%) and peripheral neuropathy in 3 patients
(21.4%) from the younger group versus 4 patients (50.0%) and 2 patients (25.0%),
respectively, Selleck PD332991 in the elderly group (P = 0.0963 and 0.6199 by Fisher’s exact probability test). In the younger group, there was also 1 case of discontinuation after re-resection and 2 patients discontinued treatment due to hematological toxicity (a second dose reduction was necessary according to the criteria in Table 1). Figure 3 Time to Treatment Failure (TTF). The Kaplan-Meier method was used to estimate TTF curves. Median value for each group is shown. Response Nineteen patients (12 from the younger group and 7 from the elderly group) could be evaluated for their response to treatment (Table 5). There were no patients with a complete response. The response rate was 60.0% in the younger group and 50.0% in the elderly group, while the disease control rate (PR+SD) was 100% and 83.3% in the younger and elderly groups, respectively. Thus, there was no difference of the response in relation to age. Table 5 Antitumor
Effects < 70 Years (n = 14) ≥ 70 Years (n = 8) P values* RR (%) 60.0 50.0 0.5490 DCR (%) 100 83.3 0.3750 CR/PR/SD/PD/NE 0/6/4/0/2 0/3/2/1/1 - Abbreviation: CR, complete response; PR, partial response; SD, stable disease; PD, progressive disease; NE, not evaluable; RR, response rate (CR+PR); DCR, disease control rate (CR+PR+SD). *P values were Mirabegron calculated with the use of Fisher’s exact probability test. Discussion In 1957, 5-fluorouracil (5-FU) became available clinically, and the advent of 5-FU therapy [5, 6] was followed by 5-FU/leucovorin (LV) therapy  that has remained standard chemotherapy for colon cancer for a very long time. After irinotecan and oxaliplatin became available, clinical studies including randomized comparative trials [8–10] of concomitant treatment with these agents and 5-FU/LV were performed.