The primary objective of the study is to evaluate the efficacy of neoadjuvant cemiplimab as measured by Pathologic complete response (pCR) rate per independent central pathology review.

The secondary objectives of the study are:

• To evaluate the efficacy of neoadjuvant cemiplimab on measures of disease response, including:
• Major pathologic response (mPR) rate per independent central pathology review
• pCR rate and mPR rate per local pathology review
• ORR prior to surgery, according to local assessment using RECIST 1.1
• To evaluate the efficacy of neoadjuvant cemiplimab on event free survival (EFS), disease free survival (DFS), and overall survival (OS)
• To evaluate the safety profile of neoadjuvant cemiplimab
• To assess change in surgical plan (ablative and reconstructive procedures) from the screening period to definitive surgery, both according to investigator review and independent surgical expert review
• To assess change in post-surgical management plan (radiation, chemoradiation, or observation) from the screening period to post-surgery pathology review, both according to investigator review and independent surgical expert review

Key Inclusion Criteria

• Stage II to IV (M0) CSCC, for which surgery would be recommended in routine clinical practice. For stage II patients, lesion must be ≥3 cm at the longest diameter.
• At least 1 lesion that is measurable by RECIST 1.1
• Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1
• Adequate organ, bone marrow function, and hepatic function as defined in the protocol

Key Exclusion Criteria

• Solid malignancy within 5 years of the projected enrollment date, or hematologic malignancy (including chronic lymphocytic leukemia [CLL]) at any time
• Distant metastatic disease (M1), visceral and/or distant nodal
• Prior radiation therapy for CSCC
• Patients with a condition requiring corticosteroid therapy (>10 mg prednisone/day or equivalent) within 14 days of the first dose of study drug.
• Patients with active, known, or suspected autoimmune disease that has required systemic therapy within 5 years of the projected enrollment date.
• History of interstitial lung disease (eg, idiopathic pulmonary fibrosis, organizing pneumonia) or active, noninfectious pneumonitis that required immune-suppressive doses of glucocorticoids to assist with management.
• Uncontrolled infection with human immunodeficiency virus (HIV), hepatitis B or hepatitis C virus (HBV or HCV) infection; or diagnosis of immunodeficiency
• Active tuberculosis

NOTE: Other protocol-defined Inclusion/Exclusion Criteria apply

All Individual Patient Data (IPD) that underlie publicly available results will be considered for sharing

When Regeneron has:

• received marketing authorization from major health authorities (e.g., FDA, European Medicines Agency (EMA), Pharmaceuticals and Medical Devices Agency (PMDA), etc.) for the product and indication or has globally discontinued development of the product for all indications on or after April 2020 and has no plans for future development
• made the study results publicly available (e.g., scientific publication, scientific conference, clinical trial registry)
• the legal authority to share the data, and
• ensured the ability to protect participant privacy

Qualified researchers can submit a proposal for access to individual patient or aggregate level data from a Regeneron-sponsored clinical trial through Vivli. Regeneron's Independent Research Request Evaluation Criteria can be found at: https://www.regeneron.com/sites/default/files/Regeneron-External-Data-Sharing-Policy-and-Independent-Research-Request-Evaluation-Criteria.pdf