Study of NKTR 255 in Combination With Cetuximab in Solid Tumors

Inclusion Criteria

• Histologically confirmed diagnosis of a locally advanced or metastatic HNSCC or CRC.
• Life expectancy > 12 weeks as determined by the Investigator.
• Eastern Cooperative Oncology Group (ECOG) performance status 0 or 1.
• Measurable disease per RECIST 1.1. HNSCC:
• Progression on any first or second line platinum-based chemotherapy and/or anti-PD-1 or programmed death-ligand 1 antibody. CRC:
• Patients must have received or were intolerant to at least 2 prior cancer therapy regimens administered for metastatic disease. Key

Exclusion Criteria

• Use of an investigational agent or an investigational device within 28 days before administration of first dose of study drug(s)
• Prior surgery or radiotherapy within 14 days of initiating study drug(s)
• Evidence of clinically significant interstitial lung disease or active, noninfectious pneumonitis; active infection requiring systemic therapy within 7 days prior to dosing
• Patients who have been previously treated with IL-2 or IL-15
• Known Grade 3 or 4 hypersensitivity reaction to cetuximab, history of allergy to red meat or tick bites, or history of positive test results for immunoglobulin E antibodies against cetuximab
• Patients who have an active, known, or suspected autoimmune disease NOTE: Other protocol defined inclusion/exclusion criteria may apply