A Study to Test Whether Treatment With BI 770371 in Combination With Pembrolizumab With or Without Cetuximab Helps People With Head and Neck Cancer Compared With Pembrolizumab Alone

Inclusion Criteria

• •Patients with histologically confirmed metastatic or recurrent HNSCC of the primary tumour location of oral cavity, oropharynx, hypopharynx, and larynx not amenable to locoregional treatment with curative intent.
• •Willingness to provide pretreatment (baseline) biopsy/tissue to the sponsor (fresh or archival one). A newly obtained biopsy is preferred but an archival sample is acceptable, with tumor tissue (formalin fixed paraffin embedded \[FFPE\] block preferred, or at least 10 freshly sectioned unstained FFPE slides) from a core or excisional biopsy. Any deviation from this rule requires approval by the sponsor. Details on the requirements for archival tumour tissue and on biopsy sample collection are provided in the Laboratory Manual.
• •Patients who have not received prior systemic treatment for metastatic or recurrent HNSCC. Systemic therapy (including cetuximab) which was completed more than 6 months prior to progression of disease if given as part of multimodal treatment for locally advanced disease is allowed.
• •Patients who do not have contraindications to pembrolizumab monotherapy according to pembrolizumab local label, guidelines, treatment standards, regulations or the document (label of another country if pembrolizumab local label is not available) provided in the investigator site file (ISF) by the sponsor.
• •Patients who do not have contraindications to treatment with cetuximab according to cetuximab local label, guidelines, treatment standards, regulations, or the document (label of another country if cetuximab local label is not available) provided in the ISF by the sponsor.
• •Presence of at least one measurable non-central nervous system (CNS) lesion (according to RECIST v1.1.).
• •Patients for whom single agent pembrolizumab is not the preferred treatment (e.g. patients for whom chemotherapy or anti-PD-1 in combination with chemotherapy is considered the preferred therapy by the investigator or treating physician).
• •Prior treatment with any anti signal regulatory protein alpha (SIRPα) or anti-integrin-associated protein (CD47) agent, regardless of treatment intent.
• •Prior cancer treatment with any anti PD-1 or anti PD-L1 agent or with an agent directed to another stimulatory or co-inhibitory Tcell receptor (e.g. CTLA-4, OX 40, CD137), regardless of treatment intent.
• •Prior allogeneic stem cell or solid organ transplantation.