PROBLEM TO BE SOLVED: To provide methods for treating gastric neoplasias.SOLUTION: The present invention relates to methods for treating gastric neoplasias, including the step of administering to a patient in need of treatment an effective amount of anti-EGFR agent, in which the patient has been determined to contain an EGFR biomarker.SELECTED DRAWING: Figure 1CCOPYRIGHT: (C)2020,JPO&INPIT【課題】胃腫瘍を処置するための方法の提供。【解決手段】処置を必要とする患者に有効量の抗EGFR薬を投与する工程を含む、胃腫瘍を処置するための方法であって、前記患者がEGFRバイオマーカーを有すると判定されている、方法。【選択図】図1C