Basket Study to Evaluate the Therapeutic Activity of Simlukafusp Alfa as a Combination Therapy in Participants With Advanced and/or Metastatic Solid Tumors

Phase 2

Terminated

Conditions: Advanced/Metastatic Head and Neck, Oesophageal and Cervical Cancers

Interventions: Drug: Gemcitabine
Drug: simlukafusp alfa
Drug: Atezolizumab (MPDL3280A), an Engineered Anti-PD-L1 Antibody
Drug: Vinorelbine

Registration Number: NCT03386721

Lead Sponsor: Hoffmann-La Roche

Brief Summary: This is an open-label, multicenter, basket trial Phase II study to evaluate the antitumor activity of simlukafusp alfa in combination with atezolizumab in participants with advanced and/or metastatic solid tumors. Currently the focus is on participants with Head and Neck, oesophageal and cervical cancers with confirmed squamous cell carcinoma histology type.

Detailed Description: Not available

Recruitment & Eligibility

Status: TERMINATED

Sex: All

Target Recruitment: 256

Inclusion Criteria

Participants who have progressed on at least one previous regimen of anticancer therapy (chemotherapy, mutation targeted therapy, and/or CPI therapy)
Measurable disease, as defined by RECIST Version 1.1
Eastern Cooperative Oncology Group (ECOG) Performance Status 0 or 1 or Karnofsky Performance Score greater than or equal to (>=) 70
Life expectancy of >=12 weeks
Confirmed at least one tumor lesion with location accessible to safely biopsy per clinical judgment of the treating physician.

Biopsies are not applicable to participants in Cohorts G, H, K, and L presenting with a single target lesion and absence of any non-target lesion.

Consent to provide an archival tumor tissue sample (if available, applicable to all participants)
Willingness to undergo baseline and on-treatment tumor biopsies for pharmacodynamics (PD) biomarker analysis (biopsies are optional for Cohort A)
Adequate cardiovascular function as defined in the study protocol
AEs related to any previous radiotherapy, chemotherapy, or surgical procedure must have resolved to Grade less than or equal to (<=) 1, except alopecia (any grade) and Grade 2 peripheral neuropathy
Adequate haematological, liver, and renal functions.
Participants with unilateral pleural effusion (indications other than NSCLC) are eligible if they fulfill both of the following:
1. NYHA Class 1
2. Forced expiratory volume 1 (FEV1) and forced vital capacity (FVC) >70% of predicted value; participants with lung metastases should present with DLCO >60% of predicted value.
Participants with Gilbert's syndrome will be eligible for the study
Participants must have had confirmed diagnosis of recurrent or metastatic squamous cell carcinoma head and neck, or esophageal cancer or metastatic, persistent or recurrent squamous cervical cancer.

Exclusion Criteria

Symptomatic or untreated central nervous system (CNS) metastases
History of treated asymptomatic CNS metastases as described in the protocol
Spinal cord compression not definitively treated with surgery and/or radiation or previously diagnosed and treated spinal cord compression without evidence that disease has been clinically stable for >=2 weeks before enrollment
Leptomeningeal disease
An active second malignancy
Penetrating tumor infiltration
Evidence of significant, uncontrolled concomitant diseases that could affect compliance with the protocol or interpretation of results
Episode of significant cardiovascular/cerebrovascular acute disease within 6 months before study treatment administration
History of significant vascular disease (for example, aortic aneurysm, aortic dissection)
Active or uncontrolled infections
Human immunodeficiency virus (HIV) or Active Hepatitis A, B, C, D or E infection (HAV/HBV/HCV/HDV/HEV).
Severe infection within 4 weeks before study treatment administration including, but not limited to, hospitalization for complications of infection, bacteremia, or severe pneumonia.
History of chronic liver disease or evidence of hepatic cirrhosis
Dementia or altered mental status that would prohibit informed consent
History of, active or suspicion of autoimmune disease
History of idiopathic pulmonary fibrosis, pneumonitis (including drug-induced), organizing pneumonia (bronchiolitis obliterans, cryptogenic organizing pneumonia, etc.), or evidence of active pneumonitis on screening chest computed tomography (CT) scan. History of radiation pneumonitis in the radiation field (fibrosis) is permitted
Bilateral pleural effusion confirmed by X-ray
Any other diseases, metabolic dysfunction, physical examination finding, or clinical laboratory finding that give reasonable suspicion of a disease or condition that would contraindicate the use of an investigational drug
Concurrent therapy with any other investigational drug
Immunomodulating agents as described in study protocol
Chronic use of steroids
Last dose with any cytostatic treatments < 28 days before study treatment administration
Radiotherapy within the last 4 weeks before start of study treatment administration, with the exception of limited field palliative radiotherapy
Administration of a live, attenuated vaccine within 4 weeks before Cycle 1 Day 1 or at any time during the study and 5 months after the last dose of atezolizumab
Major surgery or significant traumatic injury <28 days before study treatment administration (excluding fine needle biopsies) or if wound healing has not completed after surgery or anticipation of the need for major surgery during study treatment
Known hypersensitivity to any of the components of the simlukafusp alfa drug product or atezolizumab drug product
Severe dyspnea at rest or requiring supplementary oxygen therapy Locally curative options are available for participant's disease.

Study & Design

Study Type: INTERVENTIONAL

Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Cohort C (Part I)	Atezolizumab (MPDL3280A), an Engineered Anti-PD-L1 Antibody	This is a mandatory biopsy cohort based on the treatment's safety and preliminary activity analysis to enroll CPI-Naive Participants. Participants (NSCLC) will receive simlukafusp alfa intravenous (IV) infusion once in a week (QW) for first 5 doses, and once in 2 weeks (Q2W) for remaining doses up to maximum 36 months. Simlukafusp alfa will be administered at a 10 mg flat dose. Atezolizumab IV infusion will be administered in combination Q2W at a dose of 840 mg. Tumor biopsies: 2 mandatory fresh tumor biopsies, one at baseline and one on-treatment, will be collected. Additional on-treatment biopsies will be optional.
Cohort F (Part I)	Atezolizumab (MPDL3280A), an Engineered Anti-PD-L1 Antibody	CPI-experienced, docetaxel naive participants (NSCLC) who experienced disease progression during or following treatment with a platinum - containing regimen. Participants will receive combination of simlukafusp alfa and atezolizumab in a Q3W schedule. Simlukafusp alfa will be administered at a 10 mg flat dose. Atezolizumab IV infusion will be administered at a dose of 1200 mg. Tumor biopsies: one mandatory fresh tumor biopsy will be collected at baseline. Additional on-treatment biopsies will be optional.
Cohort I (Part III)	Atezolizumab (MPDL3280A), an Engineered Anti-PD-L1 Antibody	Previously treated, CPI-naïve squamous esophageal cancer (20 response evaluable participants), mandatory biopsies. Participants in cohort I Part III will receive simlukafusp alfa Q3W in combination with atezolizumab Q3W. Simlukafusp alfa will be administered at a 10 mg flat dose. Atezolizumab IV infusion will be administered at a dose of 1200 mg. Tumor biopsies: one mandatory fresh tumor biopsy will be collected at baseline. Additional on-treatment biopsies will be optional.
Cohort G (Part III)	Atezolizumab (MPDL3280A), an Engineered Anti-PD-L1 Antibody	CPI-naïve SCC of the head and neck (SCCHN) (20 response-evaluable participants), mandatory biopsies. Participants in cohort G Part III will receive simlukafusp alfa Q3W in combination with atezolizumab Q3W. Simlukafusp alfa will be administered at a 10 mg flat dose. Atezolizumab IV infusion will be administered at a dose of 1200 mg. Tumor biopsies: one mandatory fresh tumor biopsy will be collected at baseline. Additional on-treatment biopsies will be optional. Biopsies are not applicable to participants presenting with a single target lesion and absence of any non-target lesion.
Cohort A (Part I)	Atezolizumab (MPDL3280A), an Engineered Anti-PD-L1 Antibody	Checkpoint Inhibitor (CPI)-Naïve Participants with non-small-cell lung cancer (NSCLC) who have not received CPI therapy previously will receive simlukafusp alfa intravenous (IV) infusion once in a week (QW) for first 5 doses, and once in 2 weeks (Q2W) for remaining doses up to maximum 36 months. Simlukafusp alfa will be administered at a 10 mg flat dose. Atezolizumab IV infusion will be administered in combination Q2W at a dose of 840 mg. Tumor biopsies: collection of fresh tumor biopsies (at baseline and on-treatment) will be optional.
Cohort H (Part III)	Atezolizumab (MPDL3280A), an Engineered Anti-PD-L1 Antibody	Previously treated, CPI-experienced squamous cell carcinoma head and heck cancer (20 response evaluable participants), mandatory biopsies. Participants in cohort H Part III will receive simlukafusp alfa Q3W in combination with atezolizumab Q3W. Simlukafusp alfa will be administered at a 10 mg flat dose. Atezolizumab IV infusion will be administered at a dose of 1200 mg. Tumor biopsies: one mandatory fresh tumor biopsy will be collected at baseline. Additional on-treatment biopsies will be optional. Biopsies are not applicable to participants presenting with a single target lesion and absence of any non-target lesion.
Cohort M (Part III)	Atezolizumab (MPDL3280A), an Engineered Anti-PD-L1 Antibody	Esophageal SCC participants will receive simlukafusp alfa QW in combination with atezolizumab Q2W for 4 weeks followed by simlukafusp alfa in combination with atezolizumab Q2W. Simlukafusp alfa will be administered at a 10 mg flat dose. Atezolizumab IV infusion will be administered at a dose of 840 mg. Tumor biopsies: one mandatory fresh tumor biopsy will be collected at baseline. Additional on-treatment biopsies will be optional.
Cohort N (Part III)	Atezolizumab (MPDL3280A), an Engineered Anti-PD-L1 Antibody	Cervical SCC participants will receive simlukafusp alfa QW in combination with atezolizumab Q2W for 4 weeks followed by simlukafusp alfa in combination with atezolizumab Q2W. Simlukafusp alfa will be administered at a 10 mg flat dose. Atezolizumab IV infusion will be administered at a dose of 840 mg. Tumor biopsies: one mandatory fresh tumor biopsy will be collected at baseline. Additional on-treatment biopsies will be optional.
Cohort B (Part I)	Atezolizumab (MPDL3280A), an Engineered Anti-PD-L1 Antibody	CPI-Experienced Participants (NSCLC) who have received CPI therapy previously will receive simlukafusp alfa intravenous (IV) infusion once in a week (QW) for first 5 doses, and once in 2 weeks (Q2W) for remaining doses up to maximum 36 months. Simlukafusp alfa will be administered at a 10 mg flat dose. Atezolizumab IV infusion will be administered in combination Q2W at a dose of 840 mg. Tumor biopsies: 2 mandatory fresh tumor biopsies, one at baseline and one on-treatment, will be collected. Additional on-treatment biopsies will be optional.
Cohort E Arm I (Part II)	Atezolizumab (MPDL3280A), an Engineered Anti-PD-L1 Antibody	This cohort will enroll participants (NSCLC) with High-Tumor PD-L1 Expression who have not received any prior systemic therapy. Participants will receive simlukafusp alfa intravenous (IV) infusion once in a week (QW) for first 5 doses, and once in 2 weeks (Q2W) for remaining doses up to maximum 36 months. Simlukafusp alfa will be administered at a 10 mg flat dose. Atezolizumab IV infusion will be administered in combination Q2W at a dose of 840 mg. Tumor biopsies: 2 mandatory fresh tumor biopsies, one at baseline and one on-treatment, will be collected. Additional on-treatment biopsies will be optional.
Cohort D Arm I (Part I)	Atezolizumab (MPDL3280A), an Engineered Anti-PD-L1 Antibody	CPI Experienced Participants (NSCLC) who were previously treated with platinum and docetaxel. Participants will receive simlukafusp alfa intravenous (IV) infusion once in a week (QW) for first 5 doses, and once in 2 weeks (Q2W) for remaining doses up to maximum 36 months. Simlukafusp alfa will be administered at a 10 mg flat dose. Atezolizumab IV infusion will be administered in combination Q2W at a dose of 840 mg. Tumor biopsies: 2 mandatory fresh tumor biopsies, one at baseline and one on-treatment, will be collected. Additional on-treatment biopsies will be optional.
Cohort J (Part III)	Atezolizumab (MPDL3280A), an Engineered Anti-PD-L1 Antibody	Previously treated, CPI-naïve squamous cervical cancer (20 response evaluable participants): mandatory biopsy. Participants in cohort J Part III will receive simlukafusp alfa Q3W in combination with atezolizumab Q3W. Simlukafusp alfa will be administered at a 10 mg flat dose. Atezolizumab IV infusion will be administered at a dose of 1200 mg. Tumor biopsies: one mandatory fresh tumor biopsy will be collected at baseline. Additional on-treatment biopsies will be optional.
Cohort D Arm 2 (Part I)	Atezolizumab (MPDL3280A), an Engineered Anti-PD-L1 Antibody	CPI Experienced Participants (NSCLC) who were previously treated with platinum and docetaxel. Participants will receive simlukafusp alfa intravenous (IV) infusion once in 3 weeks (Q3W) up to maximum 36 months. Simlukafusp alfa will be administered at a 10 mg flat dose. Atezolizumab IV infusion will be administered in combination Q3W at a dose of 1200 mg. Tumor biopsies: 2 mandatory fresh tumor biopsies, one at baseline and one on-treatment, will be collected. Additional on-treatment biopsies will be optional.
Cohort E Arm 2 (Part II)	Atezolizumab (MPDL3280A), an Engineered Anti-PD-L1 Antibody	This cohort will enroll participants (NSCLC) with High-Tumor PD-L1 Expression who have not received any prior systemic therapy. Participants will receive simlukafusp alfa IV infusion in combination with atezolizumab Q3W. Simlukafusp alfa will be administered at a 10 mg flat dose. Atezolizumab IV infusion will be administered at a dose of 1200 mg. Tumor biopsies: 2 mandatory fresh tumor biopsies, one at baseline and one on-treatment, will be collected. Additional on-treatment biopsies will be optional.
Cohort K (Part III)	Atezolizumab (MPDL3280A), an Engineered Anti-PD-L1 Antibody	CPI-naïve SCC of the head and neck (SCCHN) (20 response-evaluable participants), mandatory biopsies. Participants in cohort K Part III will receive simlukafusp alfa QW in combination with atezolizumab Q2W for 4 weeks followed by simlukafusp alfa in combination with atezolizumab Q2W. Simlukafusp alfa will be administered at a 10 mg flat dose. Atezolizumab IV infusion will be administered at a dose of 840 mg. Tumor biopsies: one mandatory fresh tumor biopsy will be collected at baseline. Additional on-treatment biopsies will be optional. Biopsies are not applicable to participants presenting with a single target lesion and absence of any non-target lesion.
Cohort L (Part III)	Atezolizumab (MPDL3280A), an Engineered Anti-PD-L1 Antibody	Previously treated, CPI-experienced squamous cell carcinoma head and neck cancer (20 response evaluable participants), mandatory biopsies. Participants in cohort L Part III will receive simlukafusp alfa QW in combination with atezolizumab Q2W for 4 weeks followed by simlukafusp alfa in combination with atezolizumab Q2W. Simlukafusp alfa will be administered at a 10 mg flat dose. Atezolizumab IV infusion will be administered at a dose of 840 mg. Tumor biopsies: one mandatory fresh tumor biopsy will be collected at baseline. Additional on-treatment biopsies will be optional. Biopsies are not applicable to participants presenting with a single target lesion and absence of any non-target lesion.
Cohort D Arm 3 (Part I)	Gemcitabine	CPI Experienced Participants (NSCLC) who were previously treated with platinum and docetaxel will receive a single-agent gemcitabine or vinorelbine as per approved protocol. Tumor biopsies: 2 mandatory fresh tumor biopsies, one at baseline and one on-treatment, will be collected. Additional on-treatment biopsies will be optional.
Cohort D Arm 3 (Part I)	Vinorelbine	CPI Experienced Participants (NSCLC) who were previously treated with platinum and docetaxel will receive a single-agent gemcitabine or vinorelbine as per approved protocol. Tumor biopsies: 2 mandatory fresh tumor biopsies, one at baseline and one on-treatment, will be collected. Additional on-treatment biopsies will be optional.
Cohort K (Part III)	simlukafusp alfa	CPI-naïve SCC of the head and neck (SCCHN) (20 response-evaluable participants), mandatory biopsies. Participants in cohort K Part III will receive simlukafusp alfa QW in combination with atezolizumab Q2W for 4 weeks followed by simlukafusp alfa in combination with atezolizumab Q2W. Simlukafusp alfa will be administered at a 10 mg flat dose. Atezolizumab IV infusion will be administered at a dose of 840 mg. Tumor biopsies: one mandatory fresh tumor biopsy will be collected at baseline. Additional on-treatment biopsies will be optional. Biopsies are not applicable to participants presenting with a single target lesion and absence of any non-target lesion.
Cohort A (Part I)	simlukafusp alfa	Checkpoint Inhibitor (CPI)-Naïve Participants with non-small-cell lung cancer (NSCLC) who have not received CPI therapy previously will receive simlukafusp alfa intravenous (IV) infusion once in a week (QW) for first 5 doses, and once in 2 weeks (Q2W) for remaining doses up to maximum 36 months. Simlukafusp alfa will be administered at a 10 mg flat dose. Atezolizumab IV infusion will be administered in combination Q2W at a dose of 840 mg. Tumor biopsies: collection of fresh tumor biopsies (at baseline and on-treatment) will be optional.
Cohort B (Part I)	simlukafusp alfa	CPI-Experienced Participants (NSCLC) who have received CPI therapy previously will receive simlukafusp alfa intravenous (IV) infusion once in a week (QW) for first 5 doses, and once in 2 weeks (Q2W) for remaining doses up to maximum 36 months. Simlukafusp alfa will be administered at a 10 mg flat dose. Atezolizumab IV infusion will be administered in combination Q2W at a dose of 840 mg. Tumor biopsies: 2 mandatory fresh tumor biopsies, one at baseline and one on-treatment, will be collected. Additional on-treatment biopsies will be optional.
Cohort C (Part I)	simlukafusp alfa	This is a mandatory biopsy cohort based on the treatment's safety and preliminary activity analysis to enroll CPI-Naive Participants. Participants (NSCLC) will receive simlukafusp alfa intravenous (IV) infusion once in a week (QW) for first 5 doses, and once in 2 weeks (Q2W) for remaining doses up to maximum 36 months. Simlukafusp alfa will be administered at a 10 mg flat dose. Atezolizumab IV infusion will be administered in combination Q2W at a dose of 840 mg. Tumor biopsies: 2 mandatory fresh tumor biopsies, one at baseline and one on-treatment, will be collected. Additional on-treatment biopsies will be optional.
Cohort D Arm 2 (Part I)	simlukafusp alfa	CPI Experienced Participants (NSCLC) who were previously treated with platinum and docetaxel. Participants will receive simlukafusp alfa intravenous (IV) infusion once in 3 weeks (Q3W) up to maximum 36 months. Simlukafusp alfa will be administered at a 10 mg flat dose. Atezolizumab IV infusion will be administered in combination Q3W at a dose of 1200 mg. Tumor biopsies: 2 mandatory fresh tumor biopsies, one at baseline and one on-treatment, will be collected. Additional on-treatment biopsies will be optional.
Cohort D Arm I (Part I)	simlukafusp alfa	CPI Experienced Participants (NSCLC) who were previously treated with platinum and docetaxel. Participants will receive simlukafusp alfa intravenous (IV) infusion once in a week (QW) for first 5 doses, and once in 2 weeks (Q2W) for remaining doses up to maximum 36 months. Simlukafusp alfa will be administered at a 10 mg flat dose. Atezolizumab IV infusion will be administered in combination Q2W at a dose of 840 mg. Tumor biopsies: 2 mandatory fresh tumor biopsies, one at baseline and one on-treatment, will be collected. Additional on-treatment biopsies will be optional.
Cohort E Arm I (Part II)	simlukafusp alfa	This cohort will enroll participants (NSCLC) with High-Tumor PD-L1 Expression who have not received any prior systemic therapy. Participants will receive simlukafusp alfa intravenous (IV) infusion once in a week (QW) for first 5 doses, and once in 2 weeks (Q2W) for remaining doses up to maximum 36 months. Simlukafusp alfa will be administered at a 10 mg flat dose. Atezolizumab IV infusion will be administered in combination Q2W at a dose of 840 mg. Tumor biopsies: 2 mandatory fresh tumor biopsies, one at baseline and one on-treatment, will be collected. Additional on-treatment biopsies will be optional.
Cohort E Arm 2 (Part II)	simlukafusp alfa	This cohort will enroll participants (NSCLC) with High-Tumor PD-L1 Expression who have not received any prior systemic therapy. Participants will receive simlukafusp alfa IV infusion in combination with atezolizumab Q3W. Simlukafusp alfa will be administered at a 10 mg flat dose. Atezolizumab IV infusion will be administered at a dose of 1200 mg. Tumor biopsies: 2 mandatory fresh tumor biopsies, one at baseline and one on-treatment, will be collected. Additional on-treatment biopsies will be optional.
Cohort F (Part I)	simlukafusp alfa	CPI-experienced, docetaxel naive participants (NSCLC) who experienced disease progression during or following treatment with a platinum - containing regimen. Participants will receive combination of simlukafusp alfa and atezolizumab in a Q3W schedule. Simlukafusp alfa will be administered at a 10 mg flat dose. Atezolizumab IV infusion will be administered at a dose of 1200 mg. Tumor biopsies: one mandatory fresh tumor biopsy will be collected at baseline. Additional on-treatment biopsies will be optional.
Cohort G (Part III)	simlukafusp alfa	CPI-naïve SCC of the head and neck (SCCHN) (20 response-evaluable participants), mandatory biopsies. Participants in cohort G Part III will receive simlukafusp alfa Q3W in combination with atezolizumab Q3W. Simlukafusp alfa will be administered at a 10 mg flat dose. Atezolizumab IV infusion will be administered at a dose of 1200 mg. Tumor biopsies: one mandatory fresh tumor biopsy will be collected at baseline. Additional on-treatment biopsies will be optional. Biopsies are not applicable to participants presenting with a single target lesion and absence of any non-target lesion.
Cohort H (Part III)	simlukafusp alfa	Previously treated, CPI-experienced squamous cell carcinoma head and heck cancer (20 response evaluable participants), mandatory biopsies. Participants in cohort H Part III will receive simlukafusp alfa Q3W in combination with atezolizumab Q3W. Simlukafusp alfa will be administered at a 10 mg flat dose. Atezolizumab IV infusion will be administered at a dose of 1200 mg. Tumor biopsies: one mandatory fresh tumor biopsy will be collected at baseline. Additional on-treatment biopsies will be optional. Biopsies are not applicable to participants presenting with a single target lesion and absence of any non-target lesion.
Cohort I (Part III)	simlukafusp alfa	Previously treated, CPI-naïve squamous esophageal cancer (20 response evaluable participants), mandatory biopsies. Participants in cohort I Part III will receive simlukafusp alfa Q3W in combination with atezolizumab Q3W. Simlukafusp alfa will be administered at a 10 mg flat dose. Atezolizumab IV infusion will be administered at a dose of 1200 mg. Tumor biopsies: one mandatory fresh tumor biopsy will be collected at baseline. Additional on-treatment biopsies will be optional.
Cohort J (Part III)	simlukafusp alfa	Previously treated, CPI-naïve squamous cervical cancer (20 response evaluable participants): mandatory biopsy. Participants in cohort J Part III will receive simlukafusp alfa Q3W in combination with atezolizumab Q3W. Simlukafusp alfa will be administered at a 10 mg flat dose. Atezolizumab IV infusion will be administered at a dose of 1200 mg. Tumor biopsies: one mandatory fresh tumor biopsy will be collected at baseline. Additional on-treatment biopsies will be optional.
Cohort L (Part III)	simlukafusp alfa	Previously treated, CPI-experienced squamous cell carcinoma head and neck cancer (20 response evaluable participants), mandatory biopsies. Participants in cohort L Part III will receive simlukafusp alfa QW in combination with atezolizumab Q2W for 4 weeks followed by simlukafusp alfa in combination with atezolizumab Q2W. Simlukafusp alfa will be administered at a 10 mg flat dose. Atezolizumab IV infusion will be administered at a dose of 840 mg. Tumor biopsies: one mandatory fresh tumor biopsy will be collected at baseline. Additional on-treatment biopsies will be optional. Biopsies are not applicable to participants presenting with a single target lesion and absence of any non-target lesion.
Cohort M (Part III)	simlukafusp alfa	Esophageal SCC participants will receive simlukafusp alfa QW in combination with atezolizumab Q2W for 4 weeks followed by simlukafusp alfa in combination with atezolizumab Q2W. Simlukafusp alfa will be administered at a 10 mg flat dose. Atezolizumab IV infusion will be administered at a dose of 840 mg. Tumor biopsies: one mandatory fresh tumor biopsy will be collected at baseline. Additional on-treatment biopsies will be optional.
Cohort N (Part III)	simlukafusp alfa	Cervical SCC participants will receive simlukafusp alfa QW in combination with atezolizumab Q2W for 4 weeks followed by simlukafusp alfa in combination with atezolizumab Q2W. Simlukafusp alfa will be administered at a 10 mg flat dose. Atezolizumab IV infusion will be administered at a dose of 840 mg. Tumor biopsies: one mandatory fresh tumor biopsy will be collected at baseline. Additional on-treatment biopsies will be optional.

Primary Outcome Measures

Name	Time	Method
Percentage of Participants With Objective Response Rate (ORR) According to Response Evaluation Criteria in Solid Tumors (RECIST) Version 1.1	Baseline up to disease progression or study treatment discontinuation (up to 38 months)	ORR was defined as the percentage of participants with observed tumor response of complete response (CR), or partial response (PR) determined according to RECIST version 1.1. CR was defined as the disappearance of all target lesions with reduction in target/non-target pathological lymph nodes to \<10 millimeters (mm). PR was defined as at least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum diameters. The percentages of participants are rounded off to the nearest single decimal point.

Secondary Outcome Measures

Name	Time	Method
Percentage of Participants With Disease Control Rate (DCR) Determined According to RECIST Version 1.1	Baseline up to disease progression or study treatment discontinuation (up to 38 months)	DCR was defined as the percentage of participants with observed tumor response of CR, PR or stable disease (SD) determined according to RECIST version 1.1. CR was defined as the disappearance of all target lesions with reduction in target/non-target pathological lymph nodes to \<10 mm. PR was defined as at least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum diameters. SD was defined as neither sufficient shrinkage to qualify for PR nor sufficient increase to qualify for progressive disease (PD). PD is at least a 20% increase in the sum of diameters of target lesions, taking as reference the smallest sum on study including baseline (nadir). The percentages of participants are rounded off to the nearest single decimal point.
Duration of Response (DoR) According to RECIST Version 1.1	From first occurrence of documented CR or PR up to disease progression or study treatment discontinuation (assessed every 8 weeks after study treatment start for the first year, and every 12 weeks thereafter, up to 38 months)	DoR was determined for participants who had a best overall response of CR or PR. CR was defined as the disappearance of all target lesions with a reduction in target/non-target pathological lymph nodes to \< 10 mm. PR was defined as at least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum diameters. DoR was defined as the time from first occurrence of a documented objective response until the time of documented disease progression or death from any cause during treatment, whichever occurs first. Participants that did not have documented progressive disease or death during the study were censored at the day of the last tumor assessment.
Progression-Free Survival (PFS) According to RECIST Version 1.1	Study treatment initiation up to disease progression or study treatment discontinuation (up to 38 months)	PFS was defined as the time from study treatment initiation (Cycle 1 Day 1 \[1 cycle=14 days for QW/Q2W cohorts; 1 cycle=21 days for Q3W cohorts\]) to the first occurrence of documented disease progression (based on Investigator's assessment) or death from any cause during treatment, whichever occurs first. Participants that did not have documented progressive disease or death during the study were censored at the day of the last tumor assessment.
Overall Survival (OS)	From first dose of study treatment up to death due to any cause (up to approximately 47 months)	OS was defined as the time from the first dose of study treatment to the time of death from any cause on study. Participants who were still alive at the time of analysis were censored at the last date known alive.
Percentage of Participants With Adverse Events (AEs)	Baseline up to end of the study (up to approximately 47 months)	An AE is any untoward medical occurrence in a participant or clinical investigation subject administered a pharmaceutical product and which does not necessarily have to have a causal relationship with this treatment. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with the use of a medicinal product, whether or not considered related to the medicinal product.
Percentage of Participants by Programmed Death-Ligand 1 (PD-L1) Status According to Immunohistochemical Methods	Baseline
Change From Baseline in Density of Cluster of Differentiation (CD) 8 Positive (CD8+) Cells According to Immunohistochemical Methods	Baseline up 2 months
Change From Baseline in Density of Cluster of Differentiation 3 Negative (CD3-) Perforin Positive Cells According to Immunohistochemical Methods	Baseline up to 2 months
Change From Baseline in Density of PD-L1 According to Immunohistochemical Methods	Baseline up to 2 months

Trial Locations

Locations (44): University of California, San Francisco, Helen Diller Family Comprehensive Cancer Center
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San Francisco, California, United States
Cancer Treatment Centers of America
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Newnan, Georgia, United States
UZ Antwerpen
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Edegem, Belgium
UZ Gent
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Gent, Belgium
UZ Leuven Gasthuisberg
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Leuven, Belgium
Institut Bergonie
🇫🇷
Bordeaux, France
Hopital Timone Adultes; Oncologie Medicale Et Usp
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Marseille, France
ICM; Medecine B3
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Montpellier cedex 5, France
Gustave Roussy Cancer Campus
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Villejuif, France
Universitätsklinikum Essen; Innere Klinik (Tumorforschung)
🇩🇪
Essen, Germany
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University of California, San Francisco, Helen Diller Family Comprehensive Cancer Center
🇺🇸San Francisco, California, United States