This disclosure provides combination therapy for treating a subject, such as a subject afflicted with lung cancer, such as small cell lung cancer, comprising administering to the subject various combinations of an anti-fucosyl-GM1 antibody, an immunomodulatory agent, such as a PD-1/PD-L1 antagonist, such as an antagonist anti-PD-1 or anti-PD-L1 antibody, carboplatin and etoposide.