Patients who are unable to swallow whole tablets are not eligible Patients who are unable to swallow intact tablets are not eligible Patients who are unable to swallow whole tablets are not eligible Inability to swallow intact tablets Inability to swallow intact tablets Participant is unable to swallow or absorb oral tablets. Patients who are unable to swallow tablets or liquid are not eligible. The participant is unable to swallow tablets that are whole (do not crush or chew or administer via nasogastric [NG]-tube) Unable or unwilling to swallow tablets as per dosing schedule Subjects that cannot swallow tablets. Subject is unable to swallow or absorb oral tablets normally Unable or unwilling to swallow tablets or capsules Patients who are unable to swallow erlotinib tablets are not eligible Patients who are unable to swallow tablets or have a gastrointestinal disease that could hinder the absorption of enzalutamide. Unable to swallow tablets. Inability to swallow intact tablets Unable or unwilling to swallow tablets or capsules Inability to swallow intact tablets Inability to swallow intact tablets Unable or unwilling to swallow tablets The subject is unable to swallow tablets Unable or unwilling to swallow tablets The subject is unable to swallow tablets Subject is unable to swallow or absorb oral tablets normally Unable to swallow tablets Patients who cannot swallow whole tablets (i.e. medication tablets) Unwilling or unable to swallow tablets BID The subject is unable to swallow tablets The subject is unable to swallow tablets Allergy to valacyclovir or unable to take oral tablets The subject is unable to swallow tablets The subject is unable to swallow capsules or tablets Unable or unwilling to swallow tablets BID Unable or unwilling to swallow tablets Unable to swallow tablets The subject is unable to swallow tablets Any condition causing an inability to swallow tablets. The subject is unable to swallow tablets Inability to swallow tablets The subject is unable to swallow tablets Inability to swallow tablets Inability to swallow tablets or use of a feeding tube Patients who are unable or unwilling to swallow tablets Participant is unable or unwilling to swallow tablets The subject is unable to swallow tablets The subject is unable to swallow capsules tablets The participant is unable to swallow capsules or tablets Patients who are unable to swallow tablets The subject is unable to swallow tablets The subject is unable to swallow tablets Subject is unable to swallow capsules or tablets Unable or unwilling to swallow BBI608, BBI503, or sorafenib capsules or tablets The subject is unable to swallow tablets The subject is unable to swallow tablets Inability to swallow tablets for everolimus arm Inability to swallow tablets Inability to swallow tablets Unable or unwilling to swallow napabucasin capsules daily. Patients must be able to swallow capsules Patients unable to swallow capsules whole are not eligible; nasogastric or gastric (G) tube administration is not allowed Patients must be able to swallow whole capsules Patients must be able to swallow intact capsules Patients must be able to swallow intact capsules Able to swallow capsules Inability to swallow capsules or known gastrointestinal malabsorption Able to swallow ribociclib capsules Patient must be able to swallow capsules Able to swallow capsules Able to swallow capsules The subject is unable to swallow capsules. Inability to swallow capsules Inability to swallow gelatin capsules, or any medical condition that interferes with normal gastrointestinal absorption Patients must be able to swallow capsules; nasogastric or gastrostomy feeding (G) tube administration is not allowed Unable or unwilling to swallow napabucasin capsules daily. Inability to swallow capsules, since capsules cannot be crushed or broken Patients must be able to swallow capsules Patient must be able to swallow capsules Are able to swallow capsules Patients must be able to swallow intact capsules Patients must be able to swallow capsules Are able to swallow capsules. Able to swallow intact capsules Inability to swallow capsules, since capsules cannot be crushed or broken The subject is unable to swallow capsules Ability to swallow capsules unless enrolled in Part E Part E: Any patient unable to swallow capsules who otherwise meet all other eligibility criteria for Part A (expansion) B, C or D Patients must be able to swallow whole capsules; nasogastric or gastrointestinal (G)-tube administration is not allowed Able to swallow capsules Patients must be able to swallow AZD1775 capsules Ability to swallow and retain capsules. Ability to swallow capsules Inability to swallow capsules, since capsules cannot be crushed or broken PART 2 GROUP 1 INCLUSION CRITERIA: Subjects taking capsule formulations must be able to swallow capsules PART 2 GROUP 2A INCLUSION CRITERIA: Subjects taking capsule formulations must be able to swallow capsules PART 2 GROUP 3 INCLUSION CRITERIA: Subjects taking capsule formulations must be able to swallow capsules Patients must be able to swallow intact capsules whole Patient must be able to swallow capsules Inability or unwillingness to swallow capsules Unable to swallow capsules Patients with malabsorption syndrome or other condition that would interfere with intestinal absorption; patients must be able to swallow capsules Patient must be able to swallow capsules Patients who are unable to swallow oral gel capsules are not eligible Able to swallow capsules, with no surgical or anatomic condition that will preclude the patient from swallowing and absorbing oral medications Participants must be able to swallow capsules Able to swallow capsules whole (pomalidomide capsules cannot be crushed, dissolved or broken) Patients must be able to swallow whole capsules Patients must be able to swallow capsules Patient must be able to swallow capsules Inability to swallow lenalidomide capsules whole; capsules of 13-isotretinoin may be opened Patients must be able to swallow capsules Must be able to swallow ribociclib capsules Must be able to swallow capsules and have no evidence of gastrointestinal (GI) tract abnormality that would alter the absorption of oral medications Patients must be able to swallow capsules whole PHASE II: Patients must be able to swallow capsules whole Known inability to swallow capsules Patients must be able to swallow whole capsules Patients must be able to swallow capsules whole Part C: Patients must be able to swallow intact capsules Patients unable to swallow whole capsules Able to swallow whole capsules Patients taking the capsule formulation must be able to swallow capsules; feeding tube administration is allowed for patients receiving the oral solution (OS) are able to swallow capsules Patients must be able to swallow whole capsules Inability to swallow capsules. Patients must be able to swallow whole capsules Subject is able to swallow capsules Unable or unwilling to swallow BBI608 and/or BBI503 capsules daily Unable or unwilling to swallow BBI608 capsules daily. Must be able to swallow lenalidomide capsules Unable or unwilling to swallow BBI608 capsules daily Are able to swallow capsules Unable to swallow capsules Patients must be able to swallow capsules Inability to swallow capsules Patients must be able to swallow whole capsules Inability to swallow capsules. Unable or unwilling to swallow BBI608 capsules daily. Able to swallow capsules Unable or unwilling to swallow BBI503 capsules daily Unable or unwilling to swallow BBI608 capsules daily. Patients who cannot swallow capsules Patients must be able to swallow intact capsules Inability to swallow capsules or known gastrointestinal malabsorption Ability to swallow oral capsules Are able to swallow capsules Unable or unwilling to swallow the complete daily dose of ARQ 087 capsules Patients must be able to swallow the vorinostat capsules or have a feeding tube to allow for drug suspension Inability to swallow the HKI-272 capsules Able to swallow capsules Able to swallow capsules Inability to swallow capsules Patients must be able to swallow whole capsules; capsules must not be crushed or chewed; capsules must not be opened RECURRENT/ PROGRESSIVE DIPG (STRATUM 1): Patient must be able to swallow capsules whole NON-PROGRESSED DIPG (STRATUM 2): Patient must be able to swallow capsules whole Inability to swallow oral capsules Inability or unwillingness to swallow capsules Able to swallow capsules and maintain adequate hydration Patients will be excluded if they are unable to swallow capsules whole. Must be able to swallow whole capsules Unable or unwilling to swallow BBI608/placebo capsules daily. Patients must be able to swallow capsules Inability or unwillingness to swallow capsules Patients must be able to swallow whole capsules PHASE I: >= 3 years and =< 18 years of age at the time of study enrollment, if able to swallow whole capsules Inability to swallow capsules, since capsules cannot be crushed or broken Patients must be able to swallow capsules whole; nasogastric or gastrostomy (G) tube administration is not allowed Able to swallow whole capsules Patients must be able to swallow capsules Subject is able to swallow enzalutamide capsules and comply with study requirements. Patients must be able to swallow either intact capsules or mini-tabs without chewing Patient must have the ability to swallow multiple capsules Able to swallow capsules Able to swallow oral capsules without difficulty. Able to swallow capsules Patient must be able to swallow capsules (phase III only) Inability or unwillingness to swallow capsules Patients must be able to swallow whole capsules Unable or unwilling to swallow BBI608 capsules daily Patients must be able to swallow tablets whole Patients must be able to swallow tablets or capsules; a patient with any gastrointestinal disease that would impair ability to swallow, retain, or absorb drug is not eligible Patients must be able to swallow tablets Patients must be able to swallow tablets Patients must be able to swallow intact tablets Patients must be able to swallow intact tablets Patients must be able to swallow intact tablets Patients must be able to swallow intact tablets Patients must be able to swallow tablets Participants must be able to swallow ribociclib capsules or tablets Must be able to swallow ribociclib and everolimus capsules/tablets Must be able to swallow LEE011 and everolimus capsules/tablets Patients must be able to swallow tablets (or applesauce, if part of bioavailability \crushed\ six patient cohort) Able to swallow tablets. Patients must be able to swallow whole tablets or capsules; nasogastric or gastrostomy tube (G-tube) administration is not allowed Patients must be able to swallow whole tablets or capsules; nasogastric or gastrostomy tube (G-tube) administration is not allowed; any gastrointestinal disease which would impair ability to swallow, retain, or absorb drug is not allowed Participant must be able to swallow tablets or capsules. A participant with any gastrointestinal disease that would impair ability to swallow, retain, or absorb drug is not eligible. Patients must be able to swallow intact tablets Patients who are not able to swallow intact tablets are not eligible Has an inability to swallow tablets or capsules Able to swallow bicalutamide and ribociclib capsules/tablets. Be able to swallow tablets. Are able to swallow capsules and tablets. Patients must be able to swallow intact tablets; patients who cannot swallow intact tablets are not eligible Able to swallow the study drugs whole as tablets Patients must be able to swallow whole tablets CAPMATINIB EXCLUSION CRITERIA: Inability to swallow intact tablets or capsules CERITINIB EXCLUSION CRITERIA: Inability to swallow intact tablets or capsules REGORAFENIB EXCLUSION CRITERIA: Inability to swallow intact tablets or capsules ENTRECTINIB EXCLUSION CRITERIA: Inability to swallow intact tablets or capsules Patient has a condition that would prevent him or her from being able to swallow Toca FC tablets or absorb flucytosine. Inability to swallow tablets or capsules Part E: Are able to swallow capsules or tablets The subject must be able to swallow tablets, or receive tablets crushed and/or dispensed in water via nasogastric or orogastric tube. Patients must be able to swallow tablets and have no significant impairment in gastrointestinal absorption Patients who are not able to swallow capsules or tablets Must be able to swallow ribociclib and tamoxifen capsules/tablets Patients must be able to swallow tablets whole Patients must be able to swallow whole tablets or capsules; nasogastric or gastrostomy (G)-tube administration is not allowed; any gastrointestinal disease which would impair ability to swallow, retain, or absorb drug is not allowed Patients must be able to swallow capsules/tablets Patients must be able to swallow whole tablets; nasogastric or gastrostomy (G) tube administration is not allowed; tablets must not be crushed or chewed For subjects to be enrolled in Cohort 4: Able to swallow and retain orally administered tablets Are able to swallow capsules and tablets. Must be able to swallow ribociclib / placebo capsules/tablets Inability to swallow tablets or capsules Able to swallow tablets Patients must be willing and able to swallow oral tablets Are able to swallow tablets Patients must be able to swallow tablets Patients with an inability to swallow tablets or capsules Are able to swallow capsules or tablets Patients must be able to swallow tablets Able to swallow tablets Ability to swallow intact palbociclib capsules and bicalutamide tablets Patients must be able to swallow whole tablets (for MK-2206); nasogastric or gastrostomy (G) tube administration is not allowed; tablets must not be crushed or chewed Patients who are not able to swallow capsules or tablets Patients must be able to swallow whole tablets; nasogastric or gastrostomy (G) tube administration is not allowed; tablets must not be crushed or chewed Patients must be able to swallow tablets whole, without crushing Patients must be able to swallow whole tablets; tablets must not be crushed or chewed Patients must be able to swallow whole tablets and capsules Patient must be able to swallow whole tablets Patients must be able to swallow tablets Patients must be able to swallow tablets Must be able to swallow tablets and capsules GENERAL INCLUSION CRITERIA FOR SUBPROTOCOLS: Patients must be able to swallow intact capsules/tablets, unless otherwise specified in the subprotocol to which they are assigned Subjects must be able to swallow capsules/tablets Patients must be able to swallow whole tablets or capsules; nasogastric or g-tube administration is not allowed; any gastrointestinal disease which would impair ability to swallow, retain, or absorb drug is not allowed