Rifaximin in Patients With Monoclonal Gammopathy

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Emory University

Status and phase

Phase 1


IgM Monoclonal Gammopathy
IgA Monoclonal Gammopathy
IgG Monoclonal Gammopathy
Waldenstrom Macroglobulinemia
Gammopathy, Monoclonal
Smoldering Waldenstrom Macroglobulinemia
Gammopathy Igg
Light Chain Deposition Disease
Monoclonal Gammopathy


Drug: Rifaximin

Study type


Funder types



NCI-2018-02106 (Registry Identifier)
Winship4480-18 (Other Identifier)

Details and patient eligibility


This trial studies how well rifaximin works in treating patients with monoclonal gammopathy. Antibiotics, such as rifaximin, may help to kill bacteria in the intestines and reduce the abnormal protein or cells in patients with monoclonal gammopathy.

Full description

PRIMARY OBJECTIVE: I. To evaluate the effect of a 2-week course of rifaximin on clonal immunoglobulin (Ig) in patients with monoclonal gammopathy. SECONDARY OBJECTIVES: I. To evaluate safety and tolerability of a 2-week course of rifaximin. II. To evaluate changes in stool microbiota by 16S ribosomal ribonucleic acid (rRNA) gene (16S) sequencing. III. To evaluate changes in gammopathy as assessed by changes in clonal Ig and/or plasma cells. OUTLINE: Patients receive rifaximin orally (PO) thrice daily (TID) on days 1-14 in the absence of disease progression or unacceptable toxicity. After completion of study treatment, patients are followed for 8 weeks.


48 estimated patients




18+ years old


No Healthy Volunteers

Inclusion criteria

Clinical diagnosis of monoclonal gammopathy of undetermined significance based on International Myeloma Working Group (IMWG) criteria

Patients will be enrolled into one of 3 cohorts:

  • Cohort A: IgA gammopathy
  • Cohort B: IgG gammopathy / or light chain gammopathy
  • Cohort C: IgM gammopathy / asymptomatic macroglobulinemia
  • Ability to understand and the willingness to sign a written informed consent document

Exclusion criteria

  • Patients who have received antibiotics within last 3 weeks
  • Patients who are receiving any other investigational agents for gammopathy. Patients with clinical myeloma requiring anti-myeloma therapy are also excluded
  • History of allergic reactions or intolerance attributed to rifaximin or compounds of similar chemical or biologic composition to antibiotic under study
  • The effects of rifaximin on the developing human fetus are unknown. For this reason, women of child-bearing potential and men must agree to use adequate contraception (hormonal or barrier method of birth control; abstinence) prior to study entry and for the duration of study participation. Should a woman become pregnant or suspect she is pregnant while she or her partner is participating in this study, she should inform her treating physician immediately. Men treated or enrolled on this protocol must also agree to use adequate contraception prior to the study, for the duration of study participation, and 4 months after completion of rifaximin administration

Trial design

Primary purpose




Interventional model

Single Group Assignment


None (Open label)

48 participants in 1 patient group

Treatment (rifaximin)
Experimental group
Patients receive rifaximin PO TID on days 1-14 in the absence of disease progression or unacceptable toxicity.
Drug: Rifaximin

Trial contacts and locations



Central trial contact

Madhav Dhodapkar, MD

Data sourced from clinicaltrials.gov

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