Please assess the completion status of the following clinical trial:

Trial Title: A Study of Pembrolizumab (MK-3475) for First Line Treatment of Recurrent or Metastatic Squamous Cell Cancer of the Head and Neck (MK-3475-048/KEYNOTE-048)

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: NONE
- Phase: PHASE3
- Number of Arms: 3.0

Eligibility Criteria:
Inclusion Criteria:~* Histologically- or cytologically-confirmed recurrent or metastatic head and neck squamous cell carcinoma considered incurable by local therapies~* No prior systemic therapy administered in the recurrent or metastatic setting (with the exception of systemic therapy completed \> 6 months prior if given as part of multimodal treatment for locally advanced disease)~* Primary tumor locations of oropharynx, oral cavity, hypopharynx, or larynx. Participants may not have a primary tumor site of nasopharynx (any histology)~* Measurable disease~* Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1~* Adequate organ function~* Can provide tissue for PD-L1 biomarker analysis from a core or excisional biopsy (fine needle aspirate is not sufficient): A newly obtained biopsy (within 90 days prior to start of study treatment) is preferred but an archival sample is acceptable.~* Have results from testing of human papillomavirus (HPV) status for oropharyngeal cancer~* Female participants of childbearing potential should have a negative pregnancy test and must be willing to use 2 methods of birth control or be surgically sterile, or abstain from heterosexual activity for the course of the study through 180 days after the last dose of study medication~* Male participants must agree to use an adequate method of contraception starting with the first dose of study medication through 180 days after the last dose of study medication~Exclusion Criteria:~* Disease suitable for local therapy administered with curative intent~* Has progressive disease (PD) within six (6) months of completion of curatively intended systemic treatment for locoregionally advanced HNSCC~* Radiation therapy (or other non-systemic therapy) within 2 weeks prior to randomization or not fully recovered from adverse events due to a previously administered treatment~* Currently participating and receiving study therapy, or participated in a study of an investigational agent and received study therapy, or used an investigational device within 4 weeks of the first dose of study medication~* Life expectancy of \<3 months and/or has rapidly progressing disease~* Diagnosis of immunodeficiency or receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study medication (physiologic doses of corticosteroids may be approved after consultation with the Sponsor)~* Diagnosed and/or treated additional malignancy within 5 years prior to randomization with the exception of curatively treated basal cell carcinoma of the skin, squamous cell carcinoma of the skin and/or curatively resected in situ cervical and/or breast cancers~* Has had an allogeneic tissue/solid organ transplant~* Active central nervous system metastases and/or carcinomatous meningitis~* Active autoimmune disease that has required systemic treatment in past 2 years; replacement therapy is not considered a form of systemic treatment~* History of (non-infectious) pneumonitis that required steroids or current pneumonitis~* Active infection requiring systemic therapy~* Known psychiatric or substance abuse disorders that would interfere with cooperation with the requirements of the trial~* Pregnant, breastfeeding, or expecting to conceive or father children within the projected duration of the trial, starting with the screening visit through 180 days after the last dose of study medication~* Prior therapy with an anti-PD-1, anti-PD-L1, or anti-PD-L2 agent or previously participated in Merck MK-3475 clinical trial~* Known history of human immunodeficiency virus (HIV)~* Known active Hepatitis B or C~* Received a live vaccine within 30 days of planned start of study medication

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

Study Arms:
- Pembrolizumab Monotherapy (Pembro Mono) (Type: EXPERIMENTAL): Participants receive pembrolizumab 200 mg intravenously (IV) on Day 1 of each 3-week cycle for up to 35 cycles (up to \~2 years).
- Pembrolizumab + Chemotherapy (Pembro Combo) (Type: EXPERIMENTAL): Participants receive pembrolizumab 200 mg IV on Day 1 of each 3-week cycle for up to 35 cycles (up to \~2 years); plus cisplatin 100 mg/m\^2 IV or carboplatin at a target area under the curve of 5 (AUC 5) IV, per Investigator's choice, on Day 1 of each 3-week cycle (6 cycle maximum \[up to \~4 months\]); plus 5-FU 1000 mg/m\^2/day IV continuous from Day 1-4 of each 3-week cycle (6 cycle maximum \[up to \~4 months\]).
- Cetuximab + Chemotherapy (Control) (Type: ACTIVE_COMPARATOR): Participants receive cetuximab on Day 1 at a dose of 400 mg/m\^2 IV, and then 250 mg/m\^2 IV on Day 1 of each subsequent week until disease progression or unacceptable toxicity; plus cisplatin 100 mg/m\^2 IV or carboplatin AUC 5 IV (Investigator's choice) on Day 1 of each 3-week cycle (6 cycle maximum \[up to \~4 months\] for platinum-based therapy); plus 5-FU 1000 mg/m\^2/day IV continuous from Day 1-4 of each 3-week cycle (6 cycle maximum \[up to \~4 months\]).

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

Answer: outcome: complete