The application relates to a pharmaceutical combination of an allosteric EGFR inhibitor of Formula Ia or Ib: (Ia) or (Ib), or a pharmaceutically acceptable salt, hydrate, or solvate thereof, and an ATP-competitive EGFR inhibitor of Formula I': (I'), or a pharmaceutically acceptable salt, hydrate, or solvate thereof, which modulates the activity of EGFR, a pharmaceutical composition comprising the combination, and a method of treating or preventing a disease in which EGFR plays a role.