Study of Intratumoral (IT) Ulevostinag (MK-1454) in Combination With Intravenous (IV) Pembrolizumab (MK-3475) Compared to IV Pembrolizumab Alone as the First Line Treatment of Metastatic or Unresectable, Recurrent Head and Neck Squamous Cell Carcinoma (HNSCC) (MK-1454-002)

Allgemeines Krankenhaus der Stadt Wien ( Site 0049), Vienna/Wien

Chris OBrien Lifehouse ( Site 0040), Camperdown

Monash Health-Monash Medical Centre ( Site 0041), Clayton

Ordensklinikum Linz Gmbh - Barmherzige Schwestern ( Site 0051), Linz

SCRI-CCCIT GesmbH ( Site 0050), Salzburg

Haukeland Universitetssykehus, Klinisk forskningspost voksne ( Site 0086), Bergen

Calvary Central Districts Hospital ( Site 0042), Elizabeth Vale

Hospital Universitario Ramon y Cajal ( Site 0115), Madrid

Hospital Universitario Virgen de la Victoria ( Site 0114), Málaga

IUCT - Oncopole ( Site 0069), Toulouse

Henry Ford Hospital ( Site 0012), Detroit

Sanford Cancer Center Oncology Clinic ( Site 0014), Sioux Falls

Centre Oscar Lambret ( Site 0071), Lille

Washington University ( Site 0021), St Louis

Centre Leon Berard ( Site 0072), Lyon

Huntsman Cancer Institute ( Site 0004), Salt Lake City

UCLA Hematology & Oncology ( Site 0005), Los Angeles

University of California at San Francisco ( Site 0006), San Francisco

Gustave Roussy ( Site 0068), Villejuif

Rambam Medical Center ( Site 0077), Haifa

Chaim Sheba Medical Center ( Site 0076), Ramat Gan

Hadassah Medical Center. Ein Kerem ( Site 0078), Jerusalem

Centro Regional Integrado de Oncologia ( Site 0062), Fortaleza

Hospital de Caridade de Ijui ( Site 0061), Ijuí

Instituto do Cancer do Estado de Sao Paulo - ICESP ( Site 0058), São Paulo

Real e Benemerita Associacao Portuguesa de Beneficencia ( Site 0064), São Paulo

Centre Antoine Lacassagne ( Site 0070), Nice

Oslo Universitetssykehus Radiumhospitalet ( Site 0085), Oslo

Severance Hospital ( Site 0103), Seoul

Asan Medical Center ( Site 0104), Seoul

H.U. Vall de Hebron ( Site 0112), Barcelona

Hospital Clinico de Barcelona ( Site 0116), Barcelona

Royal Marsden NHS Foundation Trust ( Site 0031), London

Royal Marsden Hospital Sutton-Surrey ( Site 0032), Sutton