Abstract: Aspects of the present disclosure are directed to methods for treating a subject having cancer. Certain aspects relate to treating a subject for lung cancer by administering poziotinib to a subject determined, from analysis of tumor DNA from the subject, to have an EGFR mutation of a particular classification. Further aspects relate to methods for treating a subject for lung cancer by detecting an EGFR mutation of a particular classification in tumor DNA from the subject and administering an effective amount of poziotinib to the subject. Also disclosed are methods for stratifying and prognosing subjects based on EGFR mutation classification.