Patients must be able to swallow oral medications without crushing or chewing Able to swallow oral medications Patient is able to swallow oral medications Patients not able to swallow oral medications or with gastrointestinal conditions that may impact absorption of dasatinib Able to swallow oral medications Must be able to swallow oral medications Able to swallow oral medications. Patients must be able to swallow oral medications Patient must be able to reliably swallow oral medications Participants must be able and willing to swallow pills and to absorb oral medications Subject is able to swallow capsules and is able to take or tolerate oral medications on a continuous basis Patients must be able to swallow whole capsules and tolerate oral medications Participants must be able to swallow oral medications Patient must be able to swallow oral medications Patients must be able to take oral medications; patients must be able to swallow capsules whole without crushing or altering them in any way Able to swallow oral formulation of the study agent Are able to swallow oral medications. Patients must be able to reliably take and swallow oral medications Able to swallow oral medications EXPANSION COHORT ONLY: Able to swallow oral medications The participant is able to swallow oral medications. Patients must be able to swallow and tolerate oral medications Patients must be able to swallow oral medications Patient must be able to swallow oral medications to be eligible for study enrollment Patient is able swallow and absorb oral medications Patients not able to swallow oral medications or with gastrointestinal conditions that may impact absorption of oral medications Able to swallow oral medications Able to swallow oral medications Participants must be able to swallow the oral doses of erlotinib and PPE Able to swallow oral medications