The phase I clinical trial is to identify the MTD (Maximum Tolerated Dose) and DLT (Dose Limiting Toxicity) of CG200745 PPA in combination use of Gemcitabine and Erlotinib. Initial dose of CG200745 PPA is 187.5 mg/m^2, and it will be extended to 250 mg/m^2, 312.5 mg/m^2 or it will be reduced to 125 mg/m^2 based on the results of the cohort of 3 subjects per dose level.