In this 8-week , parallel-group , randomized , open-label trial , 62 Japanese adults with type 2 diabetes treated with insulin glargine and 50 mg of sitagliptin were randomized into the following two arms : the single-bolus group , in which once-daily insulin glulisine was initiated at a main meal at a fifth ( i.e. , 20 % ) the dose of insulin glargine , and the control group , in which the dose of sitagliptin was maximized to 100 mg .