text: The << hemoglobin A1c >> (HbA1c) of all patients improved significantly from 8.1±1.2% to 7.6±1.1% after 12 weeks of add-on therapy with [[ sitagliptin ]] (p<0.01), and the insulin dosage was reduced from 27.3±15.8 U/day to 24.5±16.5 U/day (p<0.001).