Filanesib and Carfilzomib in Treating Patients With Relapsed or Refractory Multiple Myeloma or Plasma Cell Leukemia

PRIMARY OBJECTIVES:

I. To determine the safety and the maximum-tolerated dose (MTD) of filanesib (ARRY-520) when
combined with carfilzomib.

SECONDARY OBJECTIVES:

I. To obtain preliminary estimates of the efficacy of ARRY-520 when combined with
carfilzomib.

II. To explore potential markers for patient selection and obtain a preliminary assessment of
the biological activity of ARRY-520 when combined with carfilzomib.

OUTLINE: This is a dose-escalation study.

Patients receive filanesib intravenously (IV) over 1 hour on days 1, 2, 15, and 16 and
carfilzomib IV over 10-30 minutes on days 1, 2, 8, 9, 15, and 16. Courses repeat every 28
days in the absence of disease progression or unacceptable toxicity. After 8 courses of
therapy, patients may continue with dosing of carfilzomib on days 1, 2, 15, and 16 and
filanesib as tolerated. If patient progresses on carfilzomib maintenance with administration
on days 1, 2, 15, and 16 they may increase the intensity and add in days 8 and 9 dosing.

After completion of study treatment, patients are followed up within 30 days and then
periodically thereafter.

Inclusion Criteria:

- Confirmed relapsed or refractory multiple myeloma (MM) or plasma cell leukemia (PCL);
patients should have received at least 1 prior treatment regimen; prior treatment must
have included at least one full cycle of a proteasome inhibitor (e.g., bortezomib) and
at least one full cycle of an immunomodulatory (IMiD) (e.g., thalidomide, lenalidomide
or pomalidomide); patients who have had prior ARRY-520 and carfilzomib will be allowed
in the dose escalation phase, however prior ARRY-520 and carfilzomib will be excluded
in the dose expansion cohort 1 of part A; there will be 2 cohorts in the dose
expansion of part A: cohort 1 will be patients who are carfilzomib sensitive; cohort 2
will be patients who are carfilzomib refractory

- Part B: For Part B dose-expansion: once a MTD has been established in part A,
additional dose escalation will occur with subsequent dose escalation of carfilzomib;
during the dose escalation of part B, patient (pt) must have at least 1 line of prior
therapy and no limitations on prior therapy; patients who had prior clinical
benefit/response to ARRY-520 or carfilzomib with a stable disease (SD) or better may
be eligible for dose expansion of part B; dose expansion of part B will be patients
who are carfilzomib sensitive

- Measurable MM disease, defined as one of the following:

- A monoclonal immunoglobulin (Ig) concentration on serum electrophoresis of >= 0.5
g/dL for an IgG myeloma, >= 0.1 g/dL for an IgD myeloma or 0.5 g/dL for an IgA
myeloma

- Measurable urinary light chain secretion by quantitative analysis of >= 200 mg/24
hours

- Involved serum free light chain (FLC) level >= 10 mg/dL, provided the serum FLC
ratio is abnormal

- Patients with oligo- or non-secretory disease must have bone marrow involvement
with at least 30% plasmacytosis

- Eastern Cooperative Oncology Group (ECOG) performance status (PS) of 0, 1 or 2

- Absolute neutrophil count (ANC) >= 1.5 x 10^9/L

- Platelets >= 75 x 10^9/L; if the bone marrow contains >= 50% plasma cells, a platelet
count of >= 50 x 10^9/L is allowed

- Left ventricular ejection fraction (LVEF) >= 40%; 2-dimensional (D) transthoracic
echocardiogram (ECHO) is the preferred method of evaluation; multigated acquisition
scan (MUGA) is acceptable if ECHO is not available

- Aspartate aminotransferase (AST)/serum glutamic oxaloacetic transaminase (SGOT) and/or
alanine aminotransferase (ALT)/serum glutamate pyruvic transaminase (SGPT) =< 2.5 x
the upper limit of normal (ULN)

- Bilirubin < 2.0 mg/dL

- Serum creatinine =< 2.5 mg/dL or a calculated creatinine clearance of at least 50
mL/min (using the Cockcroft and Gault method)

- 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, (those who are post-menopausal for less
than 1 year) must have negative serum or urine pregnancy test and agree to
practice 2 effective methods of contraception, at the same time, from the time of
signing the informed consent through 30 days after the last dose of study drug,
or agree to completely abstain from heterosexual intercourse

- Male patients, even if surgically sterilized (i.e., status postvasectomy), who:

- Agree to practice effective barrier contraception during the entire study
treatment period and through 30 days after the last dose of study drug, OR

- Agree to completely abstain from heterosexual intercourse

- Understand and voluntarily signed informed consent

Exclusion Criteria:

- Primary amyloidosis

- Treatment with an investigational product or device within 21 days of cycle 1 day 1

- History of allergic reaction/hypersensitivity to any of the study medications, their
analogues or excipients in the various formulations

- Cytotoxic therapy or monoclonal antibodies within 21 days prior to cycle 1 day 1

- Radiotherapy within 21 days prior to cycle 1 day 1; however, if the radiation portal
covered =< 5% of the bone marrow reserve, the patient may be enrolled irrespective of
the end date of radiotherapy

- Major surgery within 14 days and minor surgery within 7 days prior to cycle 1 day 1

- Corticosteroid doses > 10 mg/day of prednisone or equivalent within 14 days prior to
cycle 1 day 1

- Medical, psychiatric, cognitive or other conditions that compromise the patient's
ability to understand the patient information, to give informed consent, to comply
with the study protocol or to complete the study or, in the judgment of the
investigator, would make the patient inappropriate for study participation

- Known history of allergy to Captisol (a cyclodextrin derivative used to solubilize
carfilzomib)

- Contraindication to any of the required concomitant drugs or supportive treatments,
including hypersensitivity to all anticoagulation and antiplatelet options, antiviral
drugs, or intolerance to hydration due to preexisting pulmonary or cardiac impairment

- Patients who are eligible for autologous transplantation

- Active congestive heart failure (New York Heart Association [NYHA] class III to IV),
symptomatic ischemia, or conduction abnormalities uncontrolled by conventional
intervention

- Myocardial infarction within four months prior to enrollment

- Lactating women

- Patients with known human immunodeficiency virus (HIV) seropositivity

- Patients with active clinical infections