Trial of Nivolumab and Cetuximab After Chemoradiation in Esophageal Squamous Cell Carcinoma Patients.

Inclusion Criteria: * Signed written IRB approved informed consent. * Age \> 18 years. * Eastern Cooperative Oncology Group (ECOG) performance status (PS) 0-1 * Subjects with histologically confirmed operable, primary (non-recurrent) locally advanced (T3NxM0, TxN1M0) middle (distal to the thoracic inlet) or distal (up to the gastroesophageal junction) ESqCC according to endoscopic ultrasound (EUS) and PET-CT. * No prior systemic or radiation therapy for esophageal cancer. * Presence of adequate contraception in fertile patients. * Women of childbearing potential must have a negative serum or urine pregnancy test (minimum sensitivity 25 IU/L or equivalent units of HCG) within 24 hours prior to the start of study drug. * Women must not be breastfeeding. * No previous (within the last 5 years) or concurrent malignancies, with the exception of adequately treated cone-biopsied in situ carcinoma of the cervix or basal cell carcinoma of the skin. Exclusion Criteria: * Cervical esophageal tumors or tumors \< 5 cm from the cricopharyngeal cartilage. * Gastric cancers with minor involvement of the GEJ or distal esophagus, or an esophageal tumor extending beyond 2 cm into the stomach. * Prior chest or upper abdomen radiotherapy, prior systemic chemotherapy within the past 5 years or prior esophageal or gastric surgery. * Patients with evidence of metastatic disease. * Biopsy proven tumor invasion of the tracheobronchial tree or presence of tracheo-esophageal (TE) fistula or recurrent laryngeal nerve or phrenic nerve paralysis. * New York Heart Association Class III or IV heart disease. Angina or myocardial infarction within the last 12 months, history of significant ventricular arrhythmia requiring medication with antiarrhythmics, or a history of a clinically significant conduction system abnormality. * Clinically significant hearing loss. * Patients with a history of seizure disorder who are receiving phenytoin, phenobarbital, or other antiepileptic medication. * Any positive test for hepatitis B virus or hepatitis C virus indicating active infection. * Ongoing immunosuppressive therapy. * Active autoimmune disease. \[Subjects with type I diabetes mellitus, hypothyroidism only requiring hormone replacement, skin disorders (such as vitiligo, psoriasis, or alopecia) not requiring systemic treatment, or conditions not expected to recur in the absence of an external trigger are permitted to enroll\]. * Prior organ transplant. * Prior treatment with an anti-PD-1, anti-PD-L1, anti-PD-L2, anti-CD137, or anti-CTLA-4 antibody, or any other antibody or drug specifically targeting T-cell co-stimulation or checkpoint pathways. * Known history of positive test for human immunodeficiency virus (HIV) or known acquired immunodeficiency syndrome (AIDS).