Please assess the completion status of the following clinical trial:

Trial Title: Thyroid Cancer Among Chornobyl Clean-up Workers in Ukraine: Pilot Study

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

Eligibility Criteria:
* INCLUSION CRITERIA:~For the pilot study, we will select clean-up workers with thyroid cancer reported in three study areas, Kyiv, Donetsk and Dnipropetrovsk oblasts and controls (with a case-control ratio of 1:3) demographically matched to cases. We estimate the number of these cases will be between 100 and 110. These two oblasts have been chosen to represent an area known, from the leukemia study, to have a high study participation rate (Kyiv and Dnipropetrovsk oblasts) and an area newly added and thus unknown regarding participation rate (Donetsk). All study subjects are males and average about 55 years. In view of the very high survival rate for thyroid cancer, a majority of the subjects are expected to be alive.~EXCLUSION CRITERIA:~Excluded from the study will be those who cannot be located, refuse to participate in the study, or do not provide informed consent.

- Gender: MALE
- Minimum Age: 18 Years
- Maximum Age: 65 Years
- Healthy Volunteers: t

Study Arms:
- Cohort of Chernobyl Cleanup Workers in Ukraine (Type: None): Thyroid cancer cases and matched controls in the cohort

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