This study aims to determine the safety, preliminary antitumor activity, and pharmacokinetics (PK) of RYZ101 in combination with standard of care (SoC) therapy consisting of carboplatin + etoposide + atezolizumab in untreated subjects with somatostatin receptor expressing (SSTR+) ES-SCLC.

INCLUSION CRITERIA

• Age of at least 18 years at the time of signing the informed consent.

• Cytologically or histologically confirmed ES-SCLC (American Joint Committee on Cancer [AJCC] 8th edition) and is untreated or received ≤1 cycle of platinum-etoposide and PD-L1 inhibitor therapy. It is acceptable to omit the first dose of PD-L1 inhibitor therapy due to logistical reasons if receiving SoC during or prior to the start of the screening period.

• Subject is a candidate for therapy with SoC which includes:

  • Carboplatin for a maximum of 4 cycles
  • Etoposide for a maximum of 4 cycles
  • Atezolizumab

• At least 1SSTR-PET imaging-positive measurable site of disease (according to RECIST v1.1) and ≥50% of RECIST v1.1 measurable metastatic lesions must be SSTR-imaging positive.

• Adequate hematologic, renal and hepatic function

EXCLUSION CRITERIA

• Prior exposure to immune-mediated therapy,
• Known active or suspected autoimmune disease or any condition requiring systemic treatment with immunosuppressive medications within 14 days prior to first dose of study drug
• History of idiopathic pulmonary fibrosis, organizing pneumonia (e.g., bronchiolitis obliterans), drug-induced pneumonitis, or idiopathic pneumonitis. Note: History of radiation pneumonitis is permitted.
• Severe infection within 4 weeks and/or treatment with therapeutic oral or i.v. antibiotics within 2 weeks prior to initiation of study treatment.
• Prior allogeneic stem cell or solid organ transplantation.
• Treatment with a live, attenuated vaccine within 4 weeks prior to initiation of study treatment, or anticipation of need for such a vaccine during atezolizumab treatment or within 5 months after the final dose of atezolizumab.
• Radiotherapy to the chest prior to systemic therapy or planned consolidation chest radiation therapy. Radiation therapy outside of the chest for palliative care is allowed but must be completed >2 weeks prior to first dose of study drug.
• Significant cardiovascular disease and/or resistant hypertension
• Subjects with previously treated central nervous system (CNS) metastases who have not recovered from acute side effects of radiotherapy.