Cemiplimab and Fianlimab Before Surgery for the Treatment of Stage IB-IIIB Non-Small Cell Lung Cancer

Inclusion Criteria: * Age ≥ 18 years * Disease characteristics: * Histologically or cytologically confirmed stage IB-IIIB (N2) non-small cell lung cancer (NSCLC) per American Joint Committee on Cancer (AJCC) Cancer Staging Manual Eighth Edition * T4 tumors will only be eligible if they are defined as T4 based only on their size (more than 7 cm). All other T4 tumors will be ineligible. * Pathologic status of lymph nodes must be known for suspicious or enlarged lymph nodes. Note: suspicious or enlarged lymph nodes must be discussed with sponsor/principal investigator. * PD-L1 expression ≥ 1% by tumor proportion score (TPS) using immunohistochemistry (IHC) * Group A: PD-L1 expression ≥ 1% \< 50% * Group B: PD-L1 expression ≥ 50% * Complete surgical resection of the primary NSCLC must be deemed achievable by thoracic surgeon at screening * Measurable disease per Response Evaluation Criteria in Solid Tumors (RECIST) v1.1 NOTE: Tumor lesions in a previously irradiated area are not considered measurable disease; Disease that is measurable by physical examination only is not eligible * Eastern Cooperative Oncology Group (ECOG) performance status (PS) 0 or 1 * Adequate pulmonary function ascertained by treating surgeon obtained ≤ 30 days prior to registration. A pre- or post-bronchodilator forced expiratory volume in 1 second (FEV1) of 1.0 L or \> 40% postoperative predicted value or diffusing capacity of the lungs for carbon monoxide (DLCO) \> 40% predicted value…