An adult patient with permanent neonatal diabetes successfully discontinued insulin therapy after initiating sitagliptin added to sulphonylurea. Issue 5 (4th February 2021) - Oshiro, Ayaka; Ohkuma, Toshiaki; Sakamoto, Wakako; Komorita, Yuji; Oku, Yutaro; Hirakawa, Yoichiro; Kitazono, Takanari