A two part, Phase 1b/2 study to define a recommended Phase 2 dose of VRx-3996 in combination with valganciclovir (Phase 1b) designed to evaluate the efficacy of this combination in relapsed/refractory EBV+ lymphomas.



Eligible Ages
Over 18 Years
Eligible Genders
Accepts Healthy Volunteers

Inclusion Criteria

  • Relapsed/refractory, pathologically confirmed EBV+ lymphoid malignancy or lymphoproliferative disease
  • Absence of available therapy with reasonable likelihood of cure or significant clinical benefit
  • Adequate hematologic, hepatic and renal function as defined by laboratory assessment

Exclusion Criteria

  • Known primary CNS lymphoma
  • Known CNS metastases or leptomeningeal disease unless appropriately treated and neurologically stable for at least 4 weeks
  • Active, uncontrolled bacterial, viral, or fungal infection(s) requiring systemic therapy
  • Refractory graft versus host disease (GvHD) not responding to treatment
  • Known active hepatitis B virus infection
  • Circulating hepatitis C virus on qPCR
  • Known history of HHV-6 chromosomal integration
  • Known history of HIV infection

Study Design

Phase 1/Phase 2
Study Type
Intervention Model
Sequential Assignment
Intervention Model Description
Phase 1: dose escalation phase (3+3 design with definitions of dose limiting toxicity) to define a recommended phase 2 dose Phase 2: dose expansion
Primary Purpose
None (Open Label)

Arm Groups

ArmDescriptionAssigned Intervention
Phase 1b Dose Escalation
VRx-3996 (cohort 1) and valganciclovir VRx-3996 (cohort 2) and valganciclovir VRx-3996 (cohort 3) and valganciclovir VRx-3996 (cohort 4) and valganciclovir VRx-3996 (cohort 5) and valganciclovir
  • Drug: VRx-3996
    capsules taken orally once or twice daily
  • Drug: Valganciclovir
    tablets taken orally once or twice daily
Phase 2 Dose Expansion
VRx-3996 (RP2D: recommended phase 2 dose) and valganciclovir
  • Drug: VRx-3996
    capsules taken orally once or twice daily
  • Drug: Valganciclovir
    tablets taken orally once or twice daily

Recruiting Locations

The University of Kansas Cancer Center and Medical Pavilion
Westwood, Kansas 66205
Emily Kelly, Study Coordinator

More Details

Viracta Therapeutics, Inc.

Study Contact

Robert McRae, Vice President, Operations

Detailed Description

The purpose of this study is to determine whether VRx-3996 in combination with valganciclovir is safe, determine the side effect profile, and to determine whether this therapy may help patients with EBV-related lymphomas. The study has two phases. Goals of the first phase include determining a safe and tolerable dose that can be administered in phase 2. Goals of the second phase include further evaluating the safety and tolerability of VRx-3996 in combination with valganciclovir, evaluating how the drugs are metabolized in the body, evaluating response rates and other exploratory objectives that will help the researchers evaluate how these drugs work in the body. Participants will receive daily oral doses of the two study drugs and will have multiple study visits where they will have blood collected, physical examinations, and other medical monitoring.


Study information shown on this site is derived from ClinicalTrials.gov (a public registry operated by the National Institutes of Health). The listing of studies provided is not certain to be all studies for which you might be eligible. Furthermore, study eligibility requirements can be difficult to understand and may change over time, so it is wise to speak with your medical care provider and individual research study teams when making decisions related to participation.