A Randomized Placebo-Controlled Safety and Dose-Finding Study for the Use of the IL-6 Inhibitor Clazakizumab in Patients With Life-threatening COVID-19 Infection
Phase: PHASE2
Conditions: COVID-19
Sponsor: Columbia University

NCT04381052 
 
Study number: AAAT0142  
Version: 1.2, May 4, 2020 
 
A RANDOMIZED PLACEBO-CONTROLLED SAFETY AND DOSE-FINDING STUDY FOR THE USE OF THE IL-6 
INHIBITOR CLAZAKIZUMAB IN PATIENTS WITH LIFE-THREATENING COVID-19 INFECTION 
 
Principal Investigator: David J. Cohen, MD  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Rationale  
As of March 20, 2020, the novel 2019-coronavirus has infected nearly 250,000 people resulting in over 
10,000 deaths. There is no known treatment for this disease. Among the subset of patients who develop 
critical illness, evidence points towards the development of a cytokine storm syndrome that is similar to 
what is observed in secondary hemophagocytic lymphhistiocytosis (sHLH). Clinical and laboratory 
features of sHLH include high fevers, elevated ferritin, elevated triglycerides, low fibrinogen, and 
cytopenias. About half of the patients with sHLH develop ARDS which carries a high mortality (1). In 
China, hypercytokinemia was observed in patients with severe COVID disease and one study published 
online associated elevations in ferritin and IL-6 with greater mortality risk in these patients (6). It is 
reasonable to postulate that the pulmonary involvement may be the result of unchecked 
hyperinflammation, and that there may be a benefit to immunosuppressive, specifically, anti-cytokine 
therapies. Currently a multicenter randomized trial to evaluate the IL-6 receptor blocker tocilizumab is 
 
rolling out in China. Vitaeris Inc manufactures a direct IL 6 inhibitor, clazakizumab, which is currently 
under phase 3 investigations for patients with chronic active antibody mediated rejection after kidney 
transplantation. Recognizing, based on its mechanism of action, clazakizumab is hypothesized to have 
benefit for patients with life-threatening COVID-disease, Vitaeris is willing to provide drug for this 
investigator initiated trial for use in patients who are at greatest risk of dying from COVID-19 disease. 
This study is a prospective, randomized, double-blind, placebo-controlled trial of clazakizumab to 
prevent death from respiratory and multi-organ failure in COVID-
 
19 disease. An under recognized co-
morbidity in SARS-CoV-2 infected patients is acute kidney injury (AKI) occurring in up to 30% of critically 
ill patients, and contributing to fluid retention, worsening oxygenation, and the need for renal 
replacement therapy (RRT). While multiple etiologies may be at play, the effects of systemic and 
possibly local inflammation are highly likely to be significant contributing factors. Improving renal 
function via IL-6 inhibition would be a substantial clinical benefit. 
 
Name and Description of the Investigational Agent  
Investigational agent: clazakizumab  
Supplier of clazakizumab: Vitaeris Inc, Vancouver, BC, Canada  
Manufacturer: Ajinomoto Althea Bio-Pharma, Inc, San Diego CA, USA 
 
Objectives and Purpose 
Primary Objective  
The primary objective is to assess the safety of clazakizumab treatment in COVID-19 infected patients 
with respiratory failure due to hyperinflammation related to cytokine storm. 
Secondary Objectives  
The secondary objectives are to assess efficacy by evaluating the incidence and duration of mechanical 
ventilation, the length of ICU stay, severity and duration of acute kidney injury (AKI) and patient survival 
in patients who receive IP at two different doses versus placebo. 
 
Study Design and Endpoints  
This is a randomized, double-blind, placebo-controlled, design. We propose the administration of an 
investigational drug in patients with high predicted short-term mortality secondary to COVID-19 disease. 
30 Patients will be randomly assigned in a 1:1 ratio to two study arms that will receive clazakizumab at a 
dose of 25 mg or placebo.  
Primary Study Endpoints  
The primary endpoint is patient safety assessed by serious adverse events associated with clazakizumab 
or placebo. 
Secondary Study Endpoints  

The secondary endpoints are: incidence of intubation, time to extubation, length of ICU stay, trend in C-
reactive protein, severity of AKI, need for RRT, duration of RRT, and patient survival at 28 and 60 days. 
 
Eligibility 
Inclusion Criteria 
In order to be eligible to participate in this study, the patients must meet all of the following criteria: 
 
At least 18 years of age 
 
Confirmed COVID-19 disease (by Cobas SARS-CoV-2 real time reverse transcription polymerase 
chain reaction (RT-PCR) using nasopharyngeal swab sample, or equivalent test available to be 
performed by the Columbia University Irving Medical Center (CUIMC)/New York Presbyterian 
(NYP) clinical laboratory). Effort will be made to have the confirmatory test result <72 hours 
prior to enrollment however given overall clinical demand this may not be feasible in all cases. 
 
Respiratory failure manifesting as: Acute Respiratory Distress Syndrome (defined by a P/F ratio 
of <200), OR oxygen saturation (SpO2) < 90% on 4 liters (L) (actual or expected given higher O2 
requirement) OR increasing O2 requirements over 24 hours, plus 2 or more of the following 
predictors for severe disease: 
 
CRP > 35 mg/L Ferritin > 500 ng/mL D-dimer > 1 mcg/L Neutrophil-Lymphocyte Ratio > 4 Lactate 
dehydrogenase (LDH) > 200 U/L Increase in troponin in patient w/out known cardiac disease 
 
Has a consent designee willing to provide informed consent on behalf of the patient (this 
assumes that a mechanically ventilated patients lacks capacity to consent on his/her own behalf. 
Should it be deemed that the patient has capacity to consent, consent may be obtained from 
the patient.) 
 
Women of childbearing potential must be willing and able to use at least one highly effective 
contraceptive method for a period of 5 months following the study drug administration. In the 
context of this study, an effective method is defined as those which result in low failure rate (i.e. 
less than 1% per year) when used consistently and correctly such as:  
o combined (estrogen and progestogen containing) hormonal contraception combined 
(estrogen and progestogen containing) hormonal contraception (oral, intravaginal, or 
transdermal) 
o progestogen-only hormonal contraception associated with inhibition of ovulation (oral, 
injectable, implantable) 
o intrauterine device (IUD) 
o intrauterine hormone-releasing system (IUS) 
o vasectomized partner 
o bilateral tubal occlusion 
o true abstinence. when this is in line with the preferred and usual lifestyle of the subject. 
Periodic abstinence, such as calendar, ovulation, symptothermal, postovulation 
methods, and withdrawal are not acceptable methods of contraception. 
 
Men must be willing to use a double-barrier contraception from enrollment until at 5 months 
after the last dose of study drug, if not abstinent. 
Exclusion Criteria 
An individual who meets any of the following criteria will be excluded from participation in this study: 
 
Evidence of irreversible injury deemed non-survivable even if the pulmonary failure recovers 
(for example severe anoxic brain injury) 
 
Known active inflammatory bowel disease 
 
Known active, untreated diverticulitis 
 
Known untreated bacteremia 

 
Pregnancy. (The protocol will exclude pregnant subjects given the lack of overall data on use of 
clazakizumab in pregnancy however the study team would consider a protocol revision should 
more than 3 potential pregnant study subjects be excluded on this basis). 
 
Known hypersensitivity to the clazakizumab 
 
Strategies for Recruitment and Retention  
The patients enrolled will be identified by the members of the Columbia University Irving Medical Center 
/ New York Presbyterian Hospital (CUIMC/NYPH) COVID-19 inpatient team who have identified the 
potential subject as critically ill and failing all available medical and supportive therapies. Patient 
recruitment will begin by direct communication between the COVID-19 inpatient team and the study 
team. An individual involved in the patient’s care must determine and document that the patient or 
their surrogate (if the patient lacks capacity) has agreed to discuss the study with the researchers. 
Duration of Study Participation  
The entire duration of study participation is 60 days. Study specific laboratory tests will be performed 
within the first 14 days of study initiation. Beyond 14 days, all data collected will be that which is 
acquired for purposes of clinical care. Patients will be followed for the survival endpoint for 60 days. 
Total Number of Participants and Sites  
The CUIMC/NYP inpatient hospital site is expected to enroll up to30 patients across the 2 arms. NYU will 
serve as the central data managing site, and will analyze data from patients enrolled at NYU, Columbia, 
and Johns Hopkins. Total enrollment is expected to be 150 patients across three sites. Expected 
contribution of patients will be: NYU Langone (New York, NY): 90 total patients (80 already randomized 
1:1:1 and 10 to be randomized 1:1 for high-dose clazakizumab 25mg vs placebo) Johns Hopkins 
Medicine (Baltimore, MD): 30 patients to be randomized 1:1 for high-dose clazakizumab 25mg vs 
placebo New York-Presbyterian/Columbia University (New York, NY): 30 patients to be randomized 1:1 
 
for high dose clazakizumab 25mg vs placebo Columbia and Johns Hopkins will contribute de-identified 
data to the central dataset but the conduct of the trial at each site will be overseen by the local IRB the 
respective sites. 
Participant Withdrawal or Termination  
The predicted mortality rate for patients with COVID-19 and ARDS is in excess of 50% (7). As such we 
anticipate there will be mortality amongst some of the participants. Death will constitute withdrawal 
from the trial. Otherwise we would not anticipate premature withdrawal from the study as the patients 
are expected to remain hospitalized (likely in an ICU setting) for the entire duration of the 14-day period 
where study specific data are collected. If the patient is discharged before day 28 survival status will be 
obtained by patient lookup in the electronic medical record. For discharged patients in whom there is no 
definitive record documenting patient status (alive or dead) after 28 days have elapsed, the study team 
will contact the patient or patient’s family by phone to assess patient survival and to assess for the 
occurrence of any interim AEs/SAEs. At end of study (day 60), a phone call will also take place to assess 
patient survival and again asses for interim AEs/SAEs. The IP administration will occur over a maximum 
of 3 days following enrollment. Study specific laboratory tests will be performed in the first two weeks 
and if a patient (or consent designee should the patient lack capacity) wishes to withdraw from 
participation and refuse these laboratory studies, they will be free to do so. 
 
Randomization  
All enrolled subjects will be assigned a unique subject number, and the Investigator will maintain a list of 
subject numbers and subject names. A total of 30 subjects will be randomized (via an IRT) 1:1 into the 2 
treatment arms using a stratified block randomization scheme: 15 subjects in the clazakizumab 25mg 
group and 15 subjects in the placebo group. In order to randomize the subject, the study coordinator or 
investigator will enter the unique subject number and data into a centralized database system. Subjects 

meeting all clinical, site, and core lab inclusion/exclusion criteria will then be randomized to either the 
clazakizumab 25mg or placebo groups and will be registered as randomized. The randomization schema 
will be pre-prepared by a blinded statistician and will be made available only to the investigational 
pharmacy. All study investigators and clinical staff administering study drug will be blinded to the 
content of the dose. Detailed information on enrollment and randomization will be provided in the 
manual of operations.  
 
Blinding  
This study is double-blind and therefore neither the Investigator, the subject, the Sponsor and its 
representatives, nor other designated study site personnel involved in running of the study will be 
aware of the identification of the investigational drug administered to each subject. To maintain 
blinding, interim analyses will be conducted by the designated independent study monitor. Detailed 
procedures for maintaining the blind are specified below. Given that clazakizumab and placebo are 
packaged differently, investigational drug will be prepared and dispensed by an unblinded 
pharmacist/qualified personnel at each investigational site. To maintain blinding during the study, the 
pharmacist/designated staff will dispense either clazakizumab or placebo into identical infusion bags, 
according to each subject’s randomized treatment allocation, and all subjects will receive each dose of 
investigational drug (clazakizumab or placebo) as an intravenous infusion. The pharmacist/designated 
staff will ensure that blinded personnel will not have access to drug supply records. In the event of 
suspected unexpected serious adverse event(s), the blinding may be broken in the best interest of and 
to provide the appropriate care for the affected participant. 
 
Study Procedures 
This is a randomized, double-blind, placebo-controlled, adaptive seamless Phase II/III design (ASD). The 
investigators propose the administration of an investigational drug in patients with high predicted short-
term mortality secondary to COVID-19 disease. Patients will be enrolled and randomly assigned in a 1:1 
ratio to two study arms that will receive clazakizumab at a dose of 25 mg or placebo. 
 
The first dose will be administered as soon as possible after the patient is enrolled and randomized into 
the Clazakizumab 25 mg arm. The route of administration will be intravenous. Each dose will be 
administered as an infusion that is run over 30 minutes. Serum C-reactive protein (CRP) will be 
evaluated at baseline and on days 1 and 2 following clazakizumab administration. If the CRP does not 
decrease by 50% within 36-48 hours after the first dose, a second dose of 25 mg clazakizumab will be 
given no later than day 3. 
Placebo Comparator: Placebo Group 
The first dose will be administered as soon as possible after the patient is enrolled and randomized into 
the Placebo arm. The route of administration will be intravenous. Each dose will be administered as an 
infusion that is run over 30 minutes. Serum CRP will be evaluated at baseline and on days 1 and 2 
following clazakizumab administration. If the CRP does not decrease by 50% within 36-48 hours after the 
first dose, a second dose of placebo will be given no later than day 3. 
 
A detailed Schedule of Events 
Screening (Days -5 to 1):  
Inclusion and exclusion criteria verified  
Informed consent signed  
Medical history and physical exam documented (physical examination as conducted by subject’s clinical 
care team)  
Concomitant medications documented  
Experimental: Clazakizumab Group

Calculation of baseline H-score (see attached documents) for scoring sheet  
Baseline study labs drawn (CRP must be drawn on same day as infusion of Investigational Product; prior 
to infusion of Investigational Product) 
Collection of clinical data (vital signs, respiratory and hemodynamic support parameters)  
Day 1:  
Day 1 laboratory studies (CRP, if screening and Day 1 are not performed on the same day)  
Physical examination (as conducted by subject’s clinical care team)  
Infusion of clazakizumab 25mg or placebo  
IV Collection of clinical data (vital signs, respiratory and hemodynamic support parameters)  
Day 2 No window:  
Day 2 laboratory studies Physical examination (as conducted by subject’s clinical care team)  
Collection of clinical data (vital signs, respiratory and hemodynamic support parameters)  
Day 3 No window:  
Day 3 laboratory studies Physical examination (as conducted by subject’s clinical care team)  
Assessment of eligibility for repeated clazakizumab dose  
Infusion of clazakizumab 25mg or placebo IV if criteria met  
Collection of clinical data (vital signs, respiratory and hemodynamic support parameters, RRT)  
Day 4 No window:  
Day 4 laboratory studies  
Day 5 No window:  
Day 5 laboratory studies  
Day 6 No window:  
Day 6 laboratory studies  
Day 7 + 1:  
(This visit pertains only to subjects who remain inpatient at this time. If discharged, we will collect 
available data from the medical record)  
Day 7 laboratory studies  
Collection of clinical data (vital signs, laboratory results, hemodynamic parameters, respiratory 
parameters, RRT)  
Day 14 +/- 2:  
(This visit pertains only to subjects who remain inpatient at this time. If discharged, we will collect 
available data from the medical record.) 
Day 14 laboratory studies  
Collection of clinical data (vital signs, laboratory results, hemodynamic parameters, respiratory 
parameters, RRT)  
Day 28 +/- 3:  
Phone visit for documentation of survival status and assessment of interval AE/SAEs Collection of clinical 
data (laboratory results indicating kidney function, RRT)  
Day 60 +/- 5:  
Phone visit for documentation of survival status and assessment of interval AE/SAEs Collection of clinical 
data (laboratory results indicating kidney function, RRT)  
Additional clinical data to be collected:  
 
Date of symptom onset  
 
Date of intubation (if performed) 
 
Date of extubation (if performed) 
 
Date of tracheostomy (if performed) 
 
Dates of initiation/discontinuation and type of renal replacement (if performed)  

 
Use and duration of prone positioning (if performed)  
 
Date of ICU discharge (if occurs)  
 
Date of hospital discharge (if occurs)  
 
Date of death (if occurs)  
 
Additional data to be collected if testing becomes available during the conduct of this trial: Assessment 
of SARS-CoV-2 viral load by quantitative RT-PCR in blood. This would be tested at enrollment and on 
day7 if this assay becomes available and able to be performed in the New York Presbyterian Hospital 
CUIMC Clinical Laboratory. 
 
Should the patient choose to withdraw from the study before the 60 day study duration has elapsed, the 
patient’s choice to withdraw will be documented. The patient will be followed by the medical record to 
collect clinical data obtained for standard clinical care as pertains to the study outcomes. 
 
The PI will record all reportable events related to the Infusion of the Investigational Product with start 
dates occurring any time after informed consent is obtained until 7 (for non-serious AEs and SAEs) after 
the last day of study participation. At each study visit, the investigator will inquire about the occurrence 
of AE/SAEs since the last visit. Events will be followed for outcome information until resolution or 
stabilization. All unresolved adverse events should be followed by the investigator until the events are 
resolved, the subject is lost to follow-up, or the adverse event is otherwise explained. At the last 
scheduled visit, the investigator should instruct each subject to report any subsequent event(s) that the 
subject, or the subject’s personal physician, believes might reasonably be related to participation in this 
study. The investigator should notify Vitaeris of any death or adverse event occurring at any time after a 
subject has discontinued or terminated study participation that may reasonably be related to this study. 
Vitaeris should also be notified if the investigator should become aware of the development of cancer or 
of a congenital anomaly in a subsequently conceived offspring of a subject that has participated in this 
study. 
 
Statistical and Analytical Plans (SAP)  
Descriptive statistics for the safety endpoints will be used. With 10 patients, the 95% confidence interval 
(CI) around the rate of SAEs will be no more than 0.62 units wide. With 20 patients (combining the 
 
low dose and high-dose groups), the 95% CI will be no more than 0.46 units wide. Regarding the 
secondary outcome of patient survival, too little is known about the expected clinical behavior of these 
patients to make meaningful projections about expected changes in mortality given drug efficacy. Data 
will be analyzed across three sites: NYU, where this protocol originated; Columbia/NYP; and Johns 
Hopkins. 
 
The first 80 patients at NYU were enrolled in the three-arm study using a 1:1:1 ratio. Following the 
DSMB’s recommendation, additional NYU patients (expected to be 10) will be randomized in a 1:1 ratio 
to placebo or 25 mg clazakizumab. Columbia/NYP and Johns Hopkins will each enroll 30 patients in a 1:1 
randomization ratio, with 15 patients each on clazakizumab 25mg and placebo. At these other sites, 
with 15 patients, the 95% confidence interval (CI) around the rate of SAEs will be no more than 0.52 
units wide. The total planned enrollment of 150 subjects across these three sites will considerably 
increase the power to detect treatment effects. The table below summarizes approximate power for the 
projected sample size in the placebo and 25 mg clazakizumab groups (N=60 in each arm) to detect 
various reductions in mortality from the expected 50% rate in the placebo group, for various levels of 
Type I error (alpha) assuming use of a two-sided test. For example, we have approximately 82% power 

to detect a reduction in the mortality rate of 50%, from 0.5 in the placebo group to 0.25 in the treated 
group, assuming 60 patients per group, at the usual Type I error rate of 0.05. 
 
References  
1. Mehta P et al (2020). COVID-19: consider cytokine storm syndromes and immunosuppression. The 
Lancet. Published online. Available at: https://www.thelancet.com/journals/lancet/article/PIIS0140-
6736(20)30628-0/fulltext.  
2. Karkhur S et al (2019). Interleukin-6 inhibition in the management of non-infectious uveitis and 
beyond. J Ophthalmic Inflamm Infect. 2019 Sep 16;9(1):17.  
3. Weinblatt ME et al (2015). The Efficacy and Safety of Subcutaneous Clazakizumab in Patients With 
Moderate-To-Severe Rheumatoid Arthritis and an Inadequate Response to Methotrexate: Results From 
a Multinational, Phase IIb, Randomized, Double-Blind, Placebo/Active-Controlled, Dose-Ranging Study. 
Arthritis Rheumatol. 2015 Oct;67(10):2591-600.  
4. Eskandary F et al (2019). Clazakizumab in late antibody-mediated rejection: study protocol of a 
randomized controlled pilot trial. Trials. Jan 11;20(1):37.  
5. Vitaeris. Investigator’s Brochure: Clazakizumab. Version 1 Feb 2020.  
6. Ruan Q et al (2020) Clinical predictors of mortality due to COVID-19 based on an analysis of data of 
150 patients from Wuhan, China. Intensive Care Med. 2020 Mar 3.Epub. doi: 10.1007/s00134- 020-
05991-x  
7. Arentz M (2020) Characteristics and Outcomes of 21 Critically Ill Patients With COVID-19 in 
Washington State. JAMA. Published online March 19, 2020. doi:10.1001/jama.2020.4326.