Evaluating Patients With Varying Degrees of Renal Function

"S-1 administration will be determined by degree of renal impairment as follows:~Group A (Control): 30 mg/m2 BID Group B (Mild renal dysfunction): 30 mg/m2 BID Group C (Moderate renal dysfunction): 20 mg/m2 BID Group D (Severe renal dysfunction): 20 mg/m2 QD~Pharmacokinetic Phase (Part 1):~On Days -2 and 14 of the Pharmacokinetic Phase, patients will receive a single dose of S-1 administered orally in the morning.~Treatment will be followed by 1 week of recovery (Days 15 through 21).~Extension Phase (Part 2):~S-1 will be administered orally for 2 weeks (Day 1 through Day 14) followed by a 1-week recovery period (Day 15 through Day 21). This cycle will be repeated every 3 weeks."