Inclusion Criteria:

          -  Male or female patients 18 years or older

          -  Any number of prior chemotherapy or targeted agents including rapamycin analogues
             allowed

          -  Newly diagnosed or refractory/metastatic anaplastic thyroid cancer confirmed by
             histology, incurable by surgery, radiotherapy or chemoradiotherapy alone or in
             combination

          -  Must have measurable disease

          -  ECOG performance status 0-2

          -  No active intracranial metastases

          -  Tissue for correlative studies must be available

          -  Ability to swallow oral medications

          -  Voluntary written consent must be given before performance of any study related
             procedure

          -  Adequate organ function, as specified below, within 21 days:

               -  Bone marrow reserve consistent with: absolute neutrophil count (ANC) ≥ 1.5 x
                  109/L; platelet count ≥ 100 x 109/L; hemoglobin ≥ 9 g/dL;

               -  Hepatic: total bilirubin ≤1.5 x upper limit of normal (ULN), transaminases
                  (aspartate aminotransferase/serum glutamic oxaloacetic transaminase-AST/SGOT and
                  alanine aminotransferase/serum glutamic pyruvic transaminase-ALT/SGPT) ≤2.5 x ULN
                  (≤5 x ULN if liver metastases are present);

               -  Renal: creatinine clearance ≥50 mL/min

               -  Metabolic: fasting serum glucose (≤ 130 mg/dL) and fasting triglycerides ≤ 300
                  mg/dL

               -  Left ventricular ejection fraction (LVEF) within 5 absolute percentage points of
                  institutional standard of normal as measured by echocardiogram (ECHO) or multiple
                  gated acquisition scan (MUGA) within 4 weeks prior to first study drug
                  administration (ie, if the institutional normal is 50%, subject's LVEF may be as
                  low as 45% to be eligible for the study)

          -  Female patients who:

               -  Are postmenopausal for at least 1 year before the screening visit, OR

               -  Are surgically sterile, OR

               -  If they are of childbearing potential, agree to practice 2 effective methods of
                  contraception, at the same time, from the time of signing the informed consent
                  through 90 days after the last dose of study drug, or agree to completely abstain
                  from heterosexual intercourse

          -  Male patients, even if surgically sterilized (ie, status post-vasectomy), who:

               -  Agree to practice effective barrier contraception during the entire study
                  treatment period and through 90 days after the last dose of study drug, or

               -  Agree to completely abstain from heterosexual intercourse

          -  Treatment with strong CYP2C19, CYP3A4, and CYP2C9 inhibitors and/or inducers must be
             discontinued

        Exclusion Criteria:

          -  Female patients who are both lactating and breastfeeding or have a positive serum
             pregnancy test during the screening period

          -  Any serious medical or psychiatric illness that could, in the investigator's opinion,
             potentially interfere with the completion of treatment

          -  Treatment with any investigational products within 14 days

          -  Failed to recover from the reversible effects of prior anticancer therapies

          -  Manifestations of malabsorption due to prior gastrointestinal surgery or disease

          -  Poorly controlled diabetes mellitus

          -  History of any of the following within the last 6 months prior to study entry:

               -  Ischemic myocardial event

               -  Ischemic cerebrovascular event

               -  Requirement for inotropic support (excluding digoxin) or serious (uncontrolled)
                  cardiac arrhythmia

               -  Placement of a pacemaker for control of rhythm

               -  New York Heart Association Class III or IV heart failure

               -  Pulmonary embolism

          -  Significant active cardiovascular or pulmonary disease at the time of study entry,
             including:

               -  Uncontrolled high blood pressure

               -  Pulmonary hypertension

               -  Uncontrolled asthma or O2 saturation < 90%

               -  Significant valvular disease

               -  Medically significant (symptomatic) bradycardia

               -  History of arrhythmia requiring an implantable cardiac defibrillator

               -  Baseline prolongation of the rate-corrected QT interval (QTc)

          -  Treatment with hematopoietic growth factors, transfusions of blood and blood products,
             or systemic corticosteroids