Please assess the completion status of the following clinical trial:

Trial Title: The Cancer Pain and Unmet Needs Study

Study Design Characteristics:
- Allocation: None
- Intervention Model: None
- Observational Model: COHORT
- Primary Purpose: None
- Time Perspective: PROSPECTIVE
- Masking: None
- Phase: None
- Number of Arms: None

Eligibility Criteria:
Inclusion Criteria:~* Willing to take part in the study.~* Age ≥ 18.~* Able to give written informed consent.~* Able to complete study questionnaires, in conjunction with a researcher.~Exclusion Criteria:~* Cognitive impairment.~* Transient pain- if pain is not present for most of the time or does not require regular analgesia

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

Study Arms:
- Controlled Pain (Type: None): Participants who have controlled pain; requiring regular painkillers which are maintaining the pain as none - mild with no breakthrough pain episodes.
- Uncontrolled Pain (Type: None): Participants who have uncontrolled pain; pain that is moderate to severe whether on painkillers or not
- Breakthrough pain (Type: None): Participants who have breakthrough pain; pain that is controlled but the patient has episodes when the pain intermittently 'flares up'.

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