Please assess the completion status of the following clinical trial:

Trial Title: Tislelizumab Combined With Chemotherapy Versus Chemotherapy Alone in Recurrent or Metastatic Nasopharyngeal Cancer

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: QUADRUPLE
- Phase: PHASE3
- Number of Arms: 2.0

Eligibility Criteria:
Key Inclusion Criteria:~1. Able to provide written informed consent and can understand and agree to comply with the requirements of the study and the schedule of assessments~2. Aged between 18 to 75 years on the day of signing the informed consent form (or the legal age of consent in the jurisdiction in which the study is taking place)~3. Histologically or cytologically confirmed, recurrent or metastatic NPC~4. Participants must be able to provide fresh or archival tumor tissues (FFPE blocks or approximately 10 \[≥ 6\] freshly cut unstained FFPE slides) with an associated pathological report. The archival tumor tissues must be collected within 2 years before screening. In the absence of sufficient archival tumor tissues, a fresh biopsy of a tumor lesion at baseline is mandatory~5. ECOG performance status ≤ 1~6. Must have ≥ 1 measurable lesions as defined per RECIST v1.1~7. Must be treatment-naive for recurrent or metastatic nasopharyngeal cancer (NPC)~Key Exclusion Criteria:~1. Participants with locally recurrence suitable for curative surgery or radiotherapy~2. Received any approved systemic anticancer therapy, including hormonal therapy, within 28 days prior to initiation of study treatment. The following exception is allowed:~   -Palliative radiotherapy for bone metastases or soft tissue lesions should be completed \> 7 days prior to baseline imaging.~3. Has received any immunotherapy (including but not limited to interferons, interleukin 2, tumor necrosis factor interleukin, and thymoxin) or any investigational therapies within 14 days or 5 half-lives (whichever is longer) of randomization~4. Received prior therapies targeting PD-1 or PD-L1~5. Active leptomeningeal disease or uncontrolled, untreated brain metastasis~6. Active autoimmune diseases or history of autoimmune diseases that may relapse~7. Any active malignancy ≤ 2 years before randomization except for the specific cancer under investigation in this study and any locally recurring cancer that has been treated curatively (eg, resected basal or squamous cell skin cancer, superficial bladder cancer, carcinoma in situ of the cervix or breast)~NOTE: Other protocol defined Inclusion/Exclusion criteria may apply.

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

Study Arms:
- Tislelizumab combined with Gemcitabine Plus Cisplatin (Type: EXPERIMENTAL): Tislelizumab will be administered once every 3 weeks (Q3W)~Gemcitabine on Day 1, Day 8 of each 3 week cycle, for 4 to 6 cycles~Cisplatin on Day 1 of each 3 week cycle, for 4 to 6 cycles
- Placebo combined with Gemcitabine Plus Cisplatin (Type: PLACEBO_COMPARATOR): Placebo will be administered once every 3 weeks (Q3W)~Gemcitabine on Day 1, Day 8 of 3 week each cycle, for 4 to 6 cycles~Cisplatin on Day 1 of 3 week each cycle, for 4 to 6 cycles

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

Answer: outcome: complete