Background: \- Kaposi's sarcoma-associated herpes virus (KSHV)-associated multicentric Castleman disease (KSHV-MCD) is caused by a herpes virus known as KSHV. This disease can also cause several other cancers, including Kaposi sarcoma. People with KSHV-MCD often have symptoms like fever, weight and muscle loss, and fluid in the legs or abdomen. Tocilizumab may be able to block the chemicals in the body that cause KSHV-MCD symptoms. Researchers want to test this drug and other anti-virus drugs to find the best combination of drugs to treat KSHV-MCD. Objectives: \- To test the effectiveness of tocilizumab with and without other anti-virus drugs for KSHV-MCD. Eligibility: \- People at least 18 years of age who have KSHV-MCD and have certain symptoms and blood abnormalities caused by their KSHV-MCD. Design: * Participants will be screened with a medical history and physical exam. They will also have blood tests, and a skin biopsy. * Participants will have tocilizumab injections every 2 weeks for up to 12 weeks. They will provide daily blood samples for the first 3 days of treatment. * After the sixth dose, participants will be monitored for 4 weeks to check for possible side effects. * Those whose KSHV-MCD does not improve or worsens during the study may have tocilizumab combined with two other anti-virus drugs, zidovudine and valganciclovir. These drugs are pills that will be taken four times a day for 5 days out of every 2 weeks. * Blood, urine, and saliva samples will be collected throughout the study.
BACKGROUND: * Kaposi sarcoma herpesvirus-associated multicentric Castleman disease (KSHVMCD) is a rare lymphoproliferative disorder that develops predominantly in human immunodeficiency deficiency virus (HIV) infected patients. Patients often have symptoms from interleukin-6 (IL-6), KSHV encoded viral IL-6 (vIL-6), and other cytokines * Goals of therapy include rapid resolution symptoms and elimination of reservoirs of KSHV-infected plasmablasts. * Tocilizumab is a humanized anti-IL-6 receptor (gp80) antibody with activity against MCD unrelated to KSHV (KSHV-negative MCD). While tocilizumab does not directly affect vIL-6 signaling or other KSHV driven pathologic processes, IL-6 overproduction plays a major role in symptoms in KSHV-MCD, and blocking IL-6 may be sufficient to treat this disorder by blocking autocrine and paracrine stimulation. Combination with zidovudine (AZT) and valganciclovir (VGC), agents that target KSHV replication, have virus-activated cytotoxic activity, and are active in KSHV-MCD may be useful and necessary in some patients. OBJECTIVES: * Primary objective: Estimate clinical benefit of tocilizumab 8mg/kg every 2 weeks for up to 12 weeks in patients with symptomatic KSHV-MCD using a modified KSHVMCD Clinical Benefit Response Criteria * Secondary objectives: * Estimate best clinical, biochemical, radiographic, and overall responses in patients with KSHV-MCD treated for up to 12 weeks with tocilizumab 8mg/kg every 2 weeks using the prior National Cancer Institute (NCI) KSHV-MCD Response Criteria. * In patients with inadequate response to tocilizumab monotherapy: explore preliminarily the activity of tocilizumab 8mg/kg every 2 weeks, combined with AZT 600 mg orally q6 hours and VGC 900 mg orally q12 hours on days 1-5 of a 14-day cycle * Evaluate safety and tolerability of tocilizumab alone and combined with AZT/VGC * Evaluate the effect of tocilizumab on the pharmacokinetics of antiretroviral agents that are Cytochrome P450 3A4 (CYP3A4) substrates in patients with symptomatic KSHV-MCD * Evaluate progression-free and overall survival of patients treated with tocilizumab and tocilizumab/AZT/VGC * Evaluate of effect of tocilizumab on KS Eligibility * Pathologically confirmed KSHV-associated MCD * Age greater than or equal to 18 * At least one clinical symptom and at least one laboratory attributable to KSHV-MCD * Eastern Cooperative Oncology Group (ECOG) performance status less than or equal to 2 * No life- or organ-threatening manifestations of MCD * Patients requiring therapy for rheumatoid arthritis will be excluded * HIV-infected patients must agree to continue or start combination antiretroviral therapy DESIGN: * Open label, single center pilot study. Eligible patients receive tocilizumab 8 mg/kg every 2 weeks for up to 12 weeks. In addition, patients requiring treatment intensification also receive AZT 600 mg orally q6 hours and VGC 900 mg orally q12 hours on days 1-5 of a 14-day cycle. * Sample size 17: two stage phase II design, alpha equals beta equals 0.10, ruling out \<20% KSHV-MCD Clinical Benefit Partial Response or better with tocilizumab and targeting a \>50% KSHV-MCD Clinical Benefit Partial Response or better requires 10 in the first stage. 0-2 of 10 major response: stop accrual, 3+/10: accrual to 17 total. * Responses evaluated by KSHV-MCD Clinical Benefit Response Criteria and NCI KSHV-MCD criteria under prospective evaluation. * Safety and tolerability evaluated using current Common Terminology Criteria for Adverse Events (CTCAE).
Study Type
INTERVENTIONAL
Allocation
NA
Purpose
TREATMENT
Masking
NONE
Enrollment
8
Zidovudine (AZT) 600 mg orally q6 hours (every 6 hours)
Tocilizumab 8mg/kg every 2 weeks
Valganciclovir (VGC) 900 mg orally q12 hours (every 12 hours) on days 1-5 of a 14-day cycle.
National Institutes of Health Clinical Center, 9000 Rockville Pike
Bethesda, Maryland, United States
Percentage of Participants With an Overall Clinical Benefit Response
Overall clinical benefit response is defined as Complete Response (CR): Full resolution of all clinical symptoms and laboratory abnormalities (whether or not these are indicator abnormalities) probably or definitely attributable to MCD, lasting at least 3 weeks; and Partial Response (PR): At least 50% of the abnormalities probably or definitely attributed to KSHV-MCD must improve by the minimum amounts specified to attain PR. Only abnormalities present in a specific patient at baseline may count toward the achievement of a PR (e.g. if six of indicator abnormalities are present at baseline, at least three must meet the specified criteria to be considered a PR) assessed using a modified Kaposi sarcoma herpes virus-associated multicentric Castleman disease (KSHV- MCD) Clinical Benefit Response Criteria and the National Cancer Institute (NCI) KSHV-MCD criteria.
Time frame: every 2 weeks for up to 12 weeks
Percentage of Participants With a Clinical Response
Clinical response is defined as a Complete Response (CR): Full resolution of all signs and symptoms attributable to MCD, lasting 1 cycle (3-4 weeks depending on regimen; Symptom Free Disease (SFD:) Full resolution of all signs and symptoms attributable to MCD, not yet lasting 1 cycle (3-4 weeks depending on regimen); and Partial Response (PR): Improvement in at least 50% of signs and symptoms by at least 1 grade (NCI-Common Terminology Criteria for Adverse Events (CTCAE v4), with no increased MCD related increases, lasting 1 cycle (3-4 weeks depending on regimen) assessed by the National Cancer Institute Kaposi sarcoma herpes virus-associated multicentric Castleman disease (NCI KSHV-MCD) Response Criteria.
Time frame: up to 12 weeks
Percentage of Participants With a Biochemical Response
A biochemical response is defined as a Complete Response (CR): Normalization of abnormalities attributed to MCD in the following labs: Complete blood count (CBC), Chem 20, C-Reactive protein (CRP), lasting 1 cycle (3-4 weeks depending on regimen); Partial Response (PR): 50% improvement in all labs abnormalities attributable to MCD, lasting 1 cycle (3-4 weeks depending on regimen), and was assessed by the National Cancer Institute (NCI) Kaposi sarcoma herpes virus-associated multicentric Castleman Disease (KSHV-MCD) Response Criteria.
Time frame: up to 12 weeks
Percentage of Participants With a Radiographic Response
A radiographic response is defined as a Complete Response (CR): Normalization of all lymph nodes to \<1.5 cm in greatest transverse dimension, decrease to \< 1 cm of lymph nodes 1.1-1.5 cm at baseline (or 75% decrease in the sum of products of diameters (SPD)), Spleen \< 12 cm greatest dimension, no pleural effusions; Complete Response unconfirmed (CRu): Residual lymph node mass \>1.5 cm or splenomegaly \> 12 cm that has decrease by \>75% and does not change over one year; and Partial Response (PR): For lymph nodes, \>50% decrease in SPD of 6 dominant nodes, for spleen 50% decrease in longest transverse dimension assessed by the National Cancer Institute (NCI) Kaposi sarcoma herpes virus-associated multicentric Castleman Disease (KSHV-MCD) Response Criteria.
Time frame: up to 12 weeks
Percentage of Participants With Kaposi Sarcoma Responses Per the Acquired Immunodeficiency Syndrome (AIDS) Clinical Trials Group (ACTG) Response Criteria
The ACTG Criteria is defined as a Complete Response (CR), Partial Response (PR), Stable Disease (SD), Progressive Disease (PD), and Symptom Free Disease (SFD). The terms Improved (I), Stable (S), Mixed (M) Response, and Worse (W) are also used to further describe participants who have SD or PR.
Time frame: Baseline, week 7, and at off study visit, approximately 2 weeks following last study treatment for those with KS, up to 14 weeks.
Changes in Plasma Exposure of Ritonavir in Response to Tocilizumab and Zidovudine (AZT) Metabolized by Cytochrome P450 (CYP450)
Cumulative plasma exposure of Ritonavir will be evaluated.
Time frame: Cycle 1 Day 1: pre Tocilizumab, and 15 minutes, 24 hrs and 48 hrs post drug; Cycle 2-6: pre Tocilizumab dose and 15 minutes post drug dose.
Changes in Plasma Exposure of Lopinavir in Response to Tocilizumab and AZT Metabolized by Cytochrome P450 (CYP450)
Cumulative plasma exposure of Lopinavir will be evaluated.
Time frame: Cycle 1 Day 1: pre Tocilizumab, and 15 minutes, 24 hrs and 48 hrs post drug; Cycle 2-6: pre Tocilizumab dose and 15 minutes post drug dose.
Changes in Plasma Exposure of Atazanavir in Response to Tocilizumab and Zidovudine (AZT) Metabolized by Cytochrome P450 (CYP450)
Cumulative plasma exposure of Atazanavir will be evaluated.
Time frame: Cycle 1 Day 1: pre Tocilizumab, and 15 minutes, 24 hrs and 48 hrs post drug; Cycle 2-6: pre Tocilizumab dose and 15 minutes post drug dose.
Changes in Plasma Exposure of Efavirenz in Response to Tocilizumab and Zidovudine (AZT) Metabolized by Cytochrome P450 (CYP450)
Cumulative plasma exposure of Efavirenz will be evaluated.
Time frame: Cycle 1 Day 1: pre Tocilizumab, and 15 minutes, 24 hrs and 48 hrs post drug; Cycle 2-6: pre Tocilizumab dose and 15 minutes post drug dose.
Percentage of Participants With Grade 3 or Greater Serious Adverse Events
Here is the percentage of participants with Grade 3 or greater serious adverse events assessed by the Common Terminology Criteria for Adverse Events (CTCAE v5.0). A serious adverse event is an adverse event or suspected adverse reaction that results in death, a life-threatening adverse drug experience, hospitalization, disruption of the ability to conduct normal life functions, congenital anomaly/birth defect or important medical events that jeopardize the patient or subject and may require medical or surgical intervention to prevent one of the previous outcomes mentioned. Grade 3 is severe or medically significant, Grade 4 is life threatening, and Grade 5 is death.
Time frame: each cycle, up to 6 years, 8 months and 24 days.
Percentage of Participants With <Grade 3 Non- Serious Adverse Events
Here is the percentage of participants with \<Grade 3 non-serious adverse events assessed by the Common Terminology Criteria for Adverse Events (CTCAE v5.0). A non-serious adverse event is any untoward medical occurrence. Grade 1 is mild and Grade 2 is moderate.
Time frame: each cycle, up to 6 years, 8 months and 24 days.
Number of Participants With Serious and Non-serious Adverse Events Assessed by the Common Terminology Criteria for Adverse Events (CTCAE v4.0)
Here is the count of participants with serious and non-serious adverse events assessed by the Common Terminology Criteria for Adverse Events (CTCAE v4.0). A non-serious adverse event is any untoward medical occurrence. A serious adverse event is an adverse event or suspected adverse reaction that results in death, a life-threatening adverse drug experience, hospitalization, disruption of the ability to conduct normal life functions, congenital anomaly/birth defect or important medical events that jeopardize the patient or subject and may require medical or surgical intervention to prevent one of the previous outcomes mentioned.
Time frame: Date treatment consent signed to date off study, approximately 6 years, 8 months and 24 days.
Effect of Tocilizumab on the Pharmacokinetics (PK) of Antiretroviral Agents
Evaluate the effect of tocilizumab on the pharmacokinetics of antiretroviral agents that are cytochrome P3A4 (CYP3A4) substrates in patients with symptomatic Kaposi sarcoma herpes virus-associated multicentric Castleman Disease (KSHV-MCD).
Time frame: Cycle 1, Day 1 and Cycle 2-6 Day 1
Percentage of Participants Progression-free Survival at 4 Months
Progression-free survival is defined as participants who progress or die by 4 months after the start of treatment with tocilizumab and tocilizumab /AZT/VGC.
Time frame: 4 months
Percentage of Participants With Overall Survival 4 Months After Treatment With Tocilizumab and Tocilizumab /Zidovudine (AZT)/Valganciclovir (VGC)
Overall survival is defined as the percentage of participants alive at 4 months after the start of treatment with tocilizumab and tocilizumab /AZT/VGC.
Time frame: 4 months
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