Please assess the completion status of the following clinical trial:

Trial Title: A Study to Test the Safety and Efficacy of Adding Sitagliptin in Patients With Type 2 Diabetes Mellitus (MK0431-074)

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: DOUBLE
- Phase: PHASE3
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* 18 - 78 years of age~* Currently on metformin monotherapy~Exclusion Criteria:~* History of Type 1 diabetes mellitus or ketoacidosis~* Currently on a weight loss program and not in the maintenance phase or has started on a weight loss medication within the last 8 weeks~* Has undergone surgery requiring general anesthesia within the past 4 weeks or has planned major surgery~* Currently participating in a study or has participated in a study with or without an investigational compound or device within the past 12 weeks~* History of active liver disease such as chronic active hepatitis B or C, cirrhosis or symptomatic gallbladder disease~* HIV positive~* Pregnant, breast-feeding or planning to become pregnant during the study~* User of recreational or illicit drugs or has a recent history (within the past year) of drug or alcohol abuse or dependence

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 78 Years
- Healthy Volunteers: f

Study Arms:
- Sitagliptin (Type: EXPERIMENTAL): None
- Placebo (Type: PLACEBO_COMPARATOR): None

Based on this trial design, predict the completion outcome and termination type (if applicable).