 Because of the effect in the treatment of NSCLC, the capecitabine and erlotinib may compose to a new regimen for NSCLC. Based on the preclinical observation and the confirmed clinical synergistic anti-tumor activity of combined capecitabine and erlotinib in gemzar refractory advanced pancreatic cancer APC, the investigators previously conducted a phase II study of erlotinib in combination with capecitabine against NSCLC. 