Please assess the completion status of the following clinical trial:

Trial Title: ALPHA Sitagliptin Add on to Metformin (0431-103)

Study Design Characteristics:
- Allocation: NON_RANDOMIZED
- Intervention Model: SINGLE_GROUP
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: NONE
- Phase: PHASE4
- Number of Arms: 1.0

Eligibility Criteria:
Inclusion Criteria:~Patient Is Currently On Monotherapy With Metformin For At Least 10 Weeks Prior To Study Entry

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: None
- Healthy Volunteers: f

Study Arms:
- 1 (Type: EXPERIMENTAL): Sitagliptin

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