Venetoclax, Ixazomib Citrate, and Dexamethasone in Treating Patients With Relapsed Multiple Myeloma

PRIMARY OBJECTIVES:

I. To determine the maximum tolerated dose (MTD) of venetoclax in combination with ixazomib
citrate (ixazomib) and dexamethasone in patients with relapsed multiple myeloma (MM). (Phase
1) II. To evaluate therapeutic activity of venetoclax in combination with ixazomib and
dexamethasone in patients with relapsed MM. (Phase 2)

SECONDARY OBJECTIVES:

I. To describe toxicities associated with venetoclax, in combination with ixazomib and
dexamethasone in patients with relapsed MM. (Phase 1) II. To describe toxicities associated
with venetoclax, in combination with ixazomib and dexamethasone in patients with relapsed MM.
(Phase 2) III. To evaluate progression free survival following treatment with venetoclax,
ixazomib and dexamethasone in patients with relapsed MM. (Phase 2) IV. To evaluate
therapeutic activity of venetoclax in combination with ixazomib and dexamethasone in subset
of patients with relapsed MM and t(11;14) translocation. (Phase 2)

TERTIARY OBJECTIVES:

I. To explore levels of BCL-2 family member proteins (BCL-2, BCL-x, MCL-1) on bone marrow
biopsies using ribonucleic acid sequencing (RNASeq) and immunohistochemistry.

OUTLINE: This is a phase I, dose-escalation study of venetoclax followed by a phase II study.

Patients receive venetoclax orally (PO) daily on days 1-28, ixazomib citrate PO once weekly
on days 1, 8, and 15, and dexamethasone PO on days 1, 8, 15, and 22 for courses 1-12. Courses
repeat every 28 days in the absence of disease progression or unacceptable toxicity.

After completion of study treatment, patients are followed up every 3 or 6 months for 3
years.

Inclusion Criteria:

- Phase 1: Relapsed MM with at least one prior line of therapy and should have received
a proteasome inhibitor and an immunomodulatory drug

- Phase 2: 1-3 prior lines of therapy and should have received a proteasome inhibitor
and an immunomodulatory drug

- Obtained =< 14 days prior to registration: Calculated creatinine clearance (using
Cockcroft-Gault equation) >= 30 mL/min

- Obtained =< 14 days prior to registration: Absolute neutrophil count (ANC) >= 1000/uL
(without growth factor support)

- Obtained =< 14 days prior to registration: Un-transfused platelet count >= 75000/uL
(>= 50,000/uL if marrow plasma cells [PC]% > 50%)

- Obtained =< 14 days prior to registration: Hemoglobin >= 8.0 g/dL

- Obtained =< 14 days prior to registration: Total bilirubin =< 1.5 x upper limit of
normal (ULN)

- Obtained =< 14 days prior to registration: Alanine aminotransferase (ALT) and
aspartate aminotransferase (AST) =< 3 x ULN

- Obtained =< 14 days prior to registration: Alkaline phosphatase =< 750 U/L

- Expansion cohort only: Plasma cell fluorescence in situ hybridization (FISH) test
demonstrating presence of t(11;14)

- Measurable disease of multiple myeloma as defined by at least ONE of the following:

- Serum monoclonal protein >= 1.0 g/dL

- > 200 mg of monoclonal protein in the urine on 24 hour electrophoresis

- Serum immunoglobulin free light chain >= 10 mg/dL AND abnormal serum
immunoglobulin kappa to lambda free light chain ratio

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

- Provide written informed consent

- Negative serum pregnancy test done =< 7 days prior to registration, for women of
childbearing potential only

- Willing to follow strict birth control measures as suggested by the study

- Female patients: If they are of childbearing potential, must agree to one of the
following:

- Practice 2 effective methods of contraception, at the same time, from the
time of signing the informed consent form through 90 days after the last
dose of study drug, AND must also adhere to the guidelines of any
treatment-specific pregnancy prevention program, if applicable, OR

- Agree to practice true abstinence when this is in line with the preferred and
usual lifestyle of the subject; (periodic abstinence [e.g., calendar, ovulation,
symptothermal, post-ovulation methods] and withdrawal are not acceptable methods
of contraception)

- Male patients: even if surgically sterilized (i.e., status post-vasectomy), must
agree to one of the following:

- Agree to practice effective barrier contraception during the entire study
treatment period and through 120 days after the last dose of study drug, OR

- Agree to practice true abstinence when this is in line with the preferred
and usual lifestyle of the subject; (periodic abstinence (e.g., calendar,
ovulation, symptothermal, post-ovulation methods and withdrawal are not
acceptable methods of contraception)

- Life expectancy >= 12 weeks

- Willing to return to enrolling institution for follow-up (during the Active Monitoring
Phase of the study)

- Willing to provide research bone marrow aspirate specimen

Exclusion Criteria:

- Diagnosed or treated for another malignancy =< 2 years before study enrollment or
previously diagnosed with another malignancy and have any evidence of residual
disease; NOTE: Patients with non-melanoma skin cancer or carcinoma in situ of any type
are not excluded if they have undergone complete resection

- Any of the following:

- Pregnant women

- Nursing women

- Men or women of childbearing potential who are unwilling to employ adequate
contraception

- Other co-morbidity which would interfere with patient's ability to participate in
trial, e.g. uncontrolled infection, uncompensated heart or lung disease

- Other concurrent chemotherapy or any ancillary therapy considered investigational

- NOTE: Bisphosphonates are considered to be supportive care rather than therapy,
and are thus allowed while on protocol treatment

- Peripheral neuropathy >= grade 2 on clinical examination or grade 1 with pain during
the screening period

- Major surgery =< 14 days prior to study registration

- History or current evidence of any condition, therapy, or laboratory abnormality that
might confound the results of the trial, interfere with the subject?s participation
for the full duration of the trial, or is not in the best interest of the subject to
participate, in the opinion of the treating investigator

- Known history of human immunodeficiency virus (HIV) (HIV 1/2 antibodies) or active
hepatitis

- Administration of a strong or moderate CYP3A inhibitor or inducer =< 14 days prior to
registration

- Known allergy to any of the study medications, their analogues, or excipients in the
various formulations of any agent

- Participation in other clinical trials, including those with other investigational
agents not included in this trial, within 30 days of the start of this trial and
throughout the duration of this trial

- Failure to have fully recovered (i.e., =< grade 1 toxicity) from the reversible
effects of prior chemotherapy

- Radiotherapy =< 14 days prior to registration; Note: If the involved field is small, 7
days will be considered a sufficient interval between treatment and administration of
the ixazomib

- Known gastrointestinal (GI) disease or GI procedure that could interfere with the oral
absorption or tolerance of ixazomib including difficulty swallowing

- Previous treatment with ixazomib, or participated in a blinded study with ixazomib

- Live-virus vaccines =< 28 days prior to registration

- Heart failure > New York Heart Association (NYHA) class II