Ixazomib Citrate, Cyclophosphamide, and Dexamethasone in Treating Patients With Previously Untreated Symptomatic Multiple Myeloma or Light Chain Amyloidosis

Inclusion Criteria:

PHASE I ONLY:
COHORT A: multiple myeloma
COHORT B: biopsy proven light chain amyloidosis with organ involvement requiring therapy
Calculated creatinine clearance (using Cockcroft-Gault equation) >= 30 mL/min
Absolute neutrophil count (ANC) >= 1000/mm^3
Platelet count >= 75000/mm^3
Hemoglobin >= 8.0 g/dL
Total bilirubin =< 1.5 x upper limit of normal (ULN)
Alanine aminotransferase (ALT) and aspartate aminotransferase (AST) =< 3 x ULN
COHORT B ONLY: alkaline phosphatase =< 750 U/L
COHORT B ONLY: N-terminal pro b-type natriuretic peptide (NT-ProBNP) < 7500 ng/dL
Prior therapy for the treatment of solitary plasmacytoma is permitted, but > 14 days should have elapsed from the last day of radiation; NOTE: prior therapy with clarithromycin, dehydroepiandrosterone (DHEA), anakinra, pamidronate or zoledronic acid is permitted; any additional agents not listed must be approved by the principal investigator

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
COHORT B ONLY: serum immunoglobulin free light chain >= 5 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
Previously untreated
Provide informed written consent
Negative 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, 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 [eg, calendar, ovulation, symptothermal, post-ovulation methods] and withdrawal are not acceptable methods of contraception)

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

Agree to practice effective barrier contraception during the entire study treatment period and through 90 days after the last dose of study drug, OR
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 [eg, calendar, ovulation, symptothermal, post-ovulation methods] and withdrawal are not acceptable methods of contraception)
Willing to return to return to enrolling institution for follow-up (during the active monitoring phase of the study)

Exclusion Criteria:

Monoclonal gammopathy of undetermined significance (MGUS) or smoldering myeloma only
Prior cytotoxic chemotherapy or corticosteroids for the treatment of multiple myeloma; NOTE: prior corticosteroid use for the treatment of non-malignant disorders is permitted
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 nonmelanoma 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 3 on clinical examination or grade 2 with pain during the screening period
Major surgery =< 14 days prior to study registration
Systemic treatment with strong CYP3A4 inducers (rifampin, rifapentine, rifabutin, carbamazepine, phenytoin, phenobarbital, Gingko biloba, St. John?s wort) =< 14 days prior to registration
Evidence of current uncontrolled cardiovascular conditions (New York Heart Association [NYHA] class III or IV), including hypertension, cardiac arrhythmias, congestive heart failure, unstable angina, or myocardial infarction within the past 6 months; Note: prior to study entry, any electrocardiogram (ECG) abnormality at screening must be documented by the investigator as not medically relevant
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 human immunodeficiency virus (HIV) positive
Known hepatitis B surface antigen-positive status, or known or suspected active hepatitis C infection
Any serious medical or psychiatric illness that could, in the investigator?s opinion, potentially interfere with the completion of treatment according to this protocol
Known allergy to any of the study medications, their analogues or excipients in the various formulations
Known gastrointestinal (GI) disease or GI procedure that could interfere with the oral absorption or tolerance of ixazomib including difficulty swallowing
Diarrhea > grade 1, based on the National Cancer Institute (NCI) Common Terminology Criteria for Adverse Events (CTCAE) grading, in the absence of antidiarrheals
Participation in clinical trials with other investigational agents not included in this trial, =< 30 days prior to registration