Aim: To investigate platelet indices in lung cancer patients and compare in between stages. Material and methods: In this retrospective study, 71 lung cancer patients and 39 healthy subjects were enrolled into the study. Automated blood counter had been used to complete blood count. Results: Platelet count and platelet distribution width (PDW) were higher in lung cancer patients compared with healthy subjects while mean platelet volume (MPV) was not different. Among patients with lung cancer, PDW in small cell lung cancer (SCLC) patients was higher than in non-small cell lung cancer (NSCLC) patients. Platelet indices were not different in between stage III and IV NSCLC patients and in between limited and extensive disease SCLC. Conclusion: This study suggests that platelet might play roles in cancer biology. Ongoing research will lead to our increasing knowledge about platelets in this situation.