(Intervention study) The objective of the study is to confirm the superiority of the intensive therapy to the conventional therapy concerning the prevention of the incidence or exacerbation of vascular complications caused by diabetes mellitus by a randomized controlled study in patients with type 2 DM. The primary outcome measure is occurrence of myocardial infarction, coronary bypass surgery, percutaneous transluminal coronary angioplasty, stroke, carotid endarterectomy, percutaneous transluminal cerebral angioplasty, carotid artery stenting, or death.~(Follow-up study) The objective of the follow-up study is to evaluate the long-term efficacy of intensive versus conventional therapy in the effect on mortality and the prevention of the incidence or exacerbation of vascular complications caused by diabetes mellitus through a post-intervention follow-up research conducted after the multi-center, open-label, randomized parallel-group study comparing the efficacy of intensive versus conventional therapy in type 2 diabetic patients. The primary endpoint is identical to that in the intervention study. In addition, overall survivalall-cause mortality will be evaluated as a key secondary endpoint.
(Intervention study) The objective of the study is to confirm the superiority of the intensive therapy to the conventional therapy concerning the prevention of the incidence or exacerbation of vascular complications caused by diabetes mellitus (DM) by a randomized controlled study in patients with type 2 DM.~(Follow-up study) The objective of the follow-up study is to evaluate the long-term efficacy of intensive versus conventional therapy in the effect on mortality and the prevention of the incidence or exacerbation of vascular complications caused by diabetes mellitus through a post-intervention follow-up research conducted after the multi-center, open-label, randomized parallel-group study comparing the efficacy of intensive versus conventional therapy in type 2 diabetic patients.