The objective of this study is to evaluate the efficacy and safety of PG2 as a complementary treatment to conventional chemotherapy among NSCLC patients. In reference to previous studies, "Clinical Benefit Response" and "Incidence of Grade III plus VI Neutropenia" will be used as the primary endpoints in this study. Clinical Benefit Response is a metric measurement including change in cancer or cancer treatment related "fatigue" which is related to chronic fatigue syndrome (CFS), change in karnofsky performance status and change in weight. The secondary endpoints include patient's global quality of life, and the blood c-reactive protein level which is related to weight change, tumor response, survival time, incidences of myelosuppression (including neutropenia, anemia and thrombocytopenia) and the related G-CSF and antibiotics consumption.