Please assess the completion status of the following clinical trial:

Trial Title: Observation Versus Surgical Resection in Patients With Rectal Cancer Who Achieved Complete Clinical Response After Neoadjuvant Chemoradiotherapy

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

Eligibility Criteria:
Inclusion Criteria:~* Histological diagnosis of rectal adenocarcinoma~* tumors located within 10 cm from the anal verge by rigid proctoscopy measurement~* Complete clinical response after neoadjuvant treatment with chemoradiotherapy for rectal tumors clinical and radiologically staged as T3-4 N0 M0 or T (any) N + M0~* Absence of colorectal synchronous tumors~* Age between 18 and 75 years~* ECOG performance scale ≤ 2,~* last dose of chemotherapy / radiation therapy in up to 12 weeks~* Good organic function~* Absence of serious comorbidities defined by the doctor to prevent surgical resection of the rectum and / or neoadjuvant therapy.~Exclusion Criteria:~* Comorbidities clinically significant where surgical resection and / or neoadjuvant therapy is impossible, according to medical assessment.~* Prior antineoplastic therapy different from neoadjuvant therapy.~* History of Crohn's disease or ulcerative colitis.~* Confirmation or strongly suspected inherited polyp syndrome.~* Pregnant women or during lactation (women of childbearing age should have a negative pregnancy test).~* Concurrent participation in another research protocol involving therapeutic intervention.

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 75 Years
- Healthy Volunteers: f

Study Arms:
- Rectal resection (Type: ACTIVE_COMPARATOR): Surgical rectal resection
- Observation (Type: EXPERIMENTAL): Conservative approach

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