Arm 1: Celecoxib 200mg twice daily Arm 2: Celecoxib 200mg twice daily + Erlotinib 150mg daily Arm 3: Erlotinib 150mg alone Arm 4: Control group with no drug Patients in the drug treatment arm will receive the prescribed drug for 21 days before the tumor being surgically resected. Having a control group is ethically justifiable because the average waiting time in our hospital prior to definitive treatment is 30 days after diagnosis.