The main purpose of this study is to find out the good and the bad effects that the combination of cetuximab with the traditional chemotherapy regimen of cisplatin, doxorubicin, and cyclophosphamide has when given to patients with later stage thymoma or thymic carcinoma before surgery. The physicians will also look at changes in genes in the tumor that may relate to the effectiveness of cetuximab

Inclusion Criteria:

• Age>18
• Karnofsky Performance Status (KPS) ≥ 70
• Newly diagnosed or recurrent thymoma - WHO A, AB, B1, B2, or B340, or thymic carcinoma pathologically confirmed at MSKCC, MDACC or City of Hope
• No prior chemotherapy, radiotherapy, or surgical therapy (other than for diagnostic biopsy) for thymoma
• No prior treatment with cetuximab
• Clinical Masaoka Stage II (>5cm), III, or IVA(See Appendix B), including suspected invasion of mediastinum, pericardium, lung, great vessels or chest wall, and/or pleural metastases Normal marrow function: leukocytes ≥ 4,000/μl, absolute neutrophil count ≥ 1,500/μl, platelets ≥ 160,000/μl
• Adequate renal function, with creatinine ≤ 1.3 mg/dl or calculated creatinine clearance ≥60ml/min by Cockcroft and Gault equation using parameters of age, weight (kg), and baseline serum creatinine (mg/dl)
• Adequate hepatic function: Total bilirubin ≤1.5 mg/dl, AST ≤1.5X UNL, alkaline phosphatase ≤1.5 UN
• Signed informed consent
• Effective contraception
• Medically operable

Exclusion Criteria:

• Evidence of distant metastatic disease (Masaoka stage IVB)
• Thymic carcinoid
• Patients must not be receiving any other investigational agents
• Concurrent or prior malignancy in the last 5 years other than non-melanoma skin cancer and in-situ carcinoma of the cervix
• Known HIV-positive patients receiving combination anti-retroviral therapy are excluded from the study because of possible pharmacokinetic interactions with the study drugs. Patients on medications known to alter CYP3A4
• Pregnant or breastfeeding women