But the report that malignant lymphoma complicated with lung adenocarcinoma harboring EML4-ALK fusion gene in one individual is rare.     ///    Echinoderm microtubule associated protein like 4 anaplastic lymphoma kinase (EML4-ALK) as a new biological marker is a hot topic in the field of lung cancer treatment.    ///    [A case report: an EML4-ALK positive lung adenocarcinoma diagnosed ?with lymphoma previously]..     ///    "Here, we report an EML4-ALK positive non-small cell lung cancer (NSCLC) in a patient previously diagnosed with T cell lymphoma and review literature on metachronous lung cancer complicating with lymphoma. "