Please assess the completion status of the following clinical trial:

Trial Title: Effect of Pregabalin in Patients With Radiotherapy-related Neuropathic Pain

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: QUADRUPLE
- Phase: PHASE2
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~1. Patients must have received radiation therapy for histologically confirmed head and neck cancer.~2. Clinical evidence support the diagnosis of radiation-related neuropathic pain (confirmed by the Michigan Neuropathy Screening Instrument) and had a daily pain score of 4 or higher based on a numerical rating scale (0-10 points).~3. Neuropathic pain defined according to clinical history, symptoms, physical signs, and a score\>= 12 in Chinese version of Leeds Assessment of Neuropathic Symptoms and Signs questionnaire by two neurology specialists.~4. The mean duration of pain is more than 4 weeks.~5. Fertile women who are willing to take contraception during the trial.~6. Routine laboratory studies with bilirubin \</=2 \* upper limits of normal (ULN), aspartate aminotransferase (AST or SGOT) \< 2 \* ULN, creatinine \<1.0 \* ULN, red-cell count \>/= 4,000 per cubic millimeter; white-cell count \>/=1500 per cubic millimeter, platelets \>/= 75,000 per cubic millimeter; Hb \>/=9.0.~7. Ability to understand and willingness to sign a written informed consent document.~Exclusion Criteria:~1. Current diagnosis of tumor recurrence or metastasis and evidence of tumor associated pain.~2. Evidence of secondary neuropathic pain other than radiation.~3. Treatment with carbamazepine, gabapentin or pregabalin within 30 days before study enrollment.~4. Ongoing treatment for neuropathic pain.~5. History of anaphylactic response to pregabalin.~6. Evidence of sever systematic diseases.

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

Study Arms:
- Pregabalin (Type: ACTIVE_COMPARATOR): Arm I:At the 4-week dose-titration phase, will receive one capsule of pregabalin (75 mg) twice daily from Day 1 to Day 7, and two capsules of pregabalin (150 mg) twice daily from Day 8 to Day 14. From Day 15 to Day 28, patients will perform dosage adjustments based on the pain relief and tolerability. At maintenance phase, patients will take the optimized dosage of pregabalin.
- Placebo (Type: PLACEBO_COMPARATOR): Arm II:At the 4-week dose-titration phase, will receive one capsule of placebo twice daily from Day 1 to Day 7, and two capsules of placebo twice daily from Day 8 to Day 14. From Day 15 to Day 28, patients will perform dosage adjustments based on the pain relief and tolerability. At maintenance phase, patients will take the optimized dosage of placebo.

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