MÉTHODE DE TRAITEMENT DU CANCER DU POUMON NON À PETITES CELLULES RÉSISTANT À L'EGFR-TKI PAR ADMINISTRATION D'UN CONJUGUÉ ANTICORPS ANTI-HER3-MÉDICAMENT
[Problem] To provide a therapeutic agent and a therapeutic method for EGFR-TKI-resistant non-small cell lung cancer.[Solution] Provided are: a therapeutic agent that contains an anti-HER3 antibody-drug conjugate as an active ingredient, or a therapeutic method characterized by administering an anti-HER3 antibody-drug conjugate.