Objective: To study the changes of serum Hcy levels in patients with advanced lung adenocarcinoma during pemetrexed( PEM) chemotherapy,and to investigate the value of these changes in predicting chemotherapeutic efficacy of PEM in patients with advanced lung adenocarcinoma. Methods: 57 cases of lung adenocarcinoma were retrospectively analyzed. The therapeutic efficacy was evaluated according to imaging examination. Fasting venous blood in luce prima was extracted for the determination of Hcy levels before ...