ClinicalTrials.gg
WithdrawnNCT03303313Updated Oct 1, 2018

A Study of an Investigational Drug, Cemdisiran (ALN-CC5), in Patients With Atypical Hemolytic Uremic Syndrome

A Phase 2 interventional study of Cemdisiran in Atypical Hemolytic Uremic Syndrome, sponsored by Alnylam Pharmaceuticals. Withdrawn at 12 sites in 10 countries. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2018-10-01.

Sponsored by Alnylam Pharmaceuticals · Phase 2, Interventional, and Treatment

Why this study was withdrawn
Study terminated early due to lack of enrollment.
Phase
Phase 2
Study type
Interventional
Enrollment
0
Allocation
Not applicable
Ages
18 Years and older
Sex
All
01

Study summary

The purpose of this study is to evaluate the safety, tolerability and pharmacokinetics of Cemdisiran in patients with aHUS.

02

Conditions studied

  • Atypical Hemolytic Uremic Syndrome

Keywords

  • RNAi therapeutic
  • Atypical Hemolytic Uremic Syndrome
  • Hemolysis
  • Thrombocytopenia
  • Renal insufficiency
  • Thrombotic Microangiopathy
  • aHUS
  • TMA
03

In context

Atypical Hemolytic Uremic Syndrome

45 studies on the registry are indexed under Atypical Hemolytic Uremic Syndrome; 14 are open to participants now.

Browse Atypical Hemolytic Uremic Syndrome studies →

Lead sponsor

Alnylam Pharmaceuticals is the lead sponsor of 84 studies on the registry; 19 are open to participants now.

Of its 18 completed or terminated interventional studies of FDA-regulated products, 15 (83%) have results posted.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years and older
Sexes eligible
All
Accepts healthy volunteers
No

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

  1. Willing to provide written and to comply with the study requirements
  2. Age 18 years or older
  3. Clinical diagnosis of primary aHUS
  4. Clinical thrombotic microangiopathy (TMA) activity
  5. Women of must have a negative pregnancy test, cannot be breast feeding, and must be willing to use a highly effective method of
  6. Previously vaccinated with meningococcal group ACWY conjugate vaccine and meningococcal group B vaccine or willingness to receive these vaccinations
  7. ADAMTS13 >10% or other proven aHUS-associated mutation

Exclusion criteria

Exclusion Criteria:

  1. abnormal laboratory results
  2. Positive Shiga toxin producing Escherichia coli test at Screening
  3. Suspected secondary aHUS, in the opinion of the Investigator (unless there is a documented aHUS-associated genetic mutation)
  4. Positive direct Coombs test
  5. Patients who have received hemodialysis for >3 months
  6. Bone marrow transplant recipients
  7. Organ transplant recipients, except for kidney transplant recipients with primary aHUS (confirmed by known genetic mutation and kidney )
  8. Known history or evidence of systemic lupus erythematosus or antiphospholipid antibody syndrome
  9. History of multiple drug allergies or history of allergic reaction to an oligonucleotide or GalNAc
  10. (except for non-melanoma skin cancers, cervical in-situ carcinoma, breast ductal carcinoma in situ, or stage 1 prostate carcinoma) within the last 5 years
  11. Patients with a poor prognosis that is expected to limit their to less than 3 months, in the opinion of the Investigator
Terms in these criteria, in plain language(7)

Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.

Informed consent

Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.

You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.

Childbearing potential

Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).

Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.

Contraception

Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.

Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.

Clinically significant

Judged by the study doctor to matter for your health or for the study. It is a doctor’s decision, so ask the study team if you are unsure whether something counts.

Biopsy and archival tissue

A biopsy takes a small piece of tissue to examine. “Archival tissue” is a sample already taken, for example at diagnosis, and kept by the hospital.

Whether a stored sample will do depends on when it was taken, how much there is and what the study needs. Ask whether the study accepts your stored sample or needs a new biopsy.

Cancer (malignancy)

Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.

Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.

Life expectancy

The study doctor’s estimate of how long someone is likely to live. Criteria use it so that people can stay in the study long enough for it to answer its question.

05

Study design

Phase
Phase 2
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrollment
0 participants (actual)

Study arms

  • Experimental
    Cemdisiran

    Drug: Cemdisiran

Interventions

  • Subcutaneous (sc) injection of Cemdisiran

06

What researchers measure

Primary outcomes

  1. The effect of Cemdisiran on platelet count

    Time frame: Week 32

Secondary outcomes

  1. The effect of Cemdisiran on hematological response as measured by platelet count

    Time frame: after 32 weeks of treatment

  2. The effect of Cemdisiran on hematological response as measured by lactate dehydrogenase (LDH)

    Time frame: after 32 weeks of treatment

  3. The effect of Cemdisiran on hematological response as measured by rescue plasma therapy

    Time frame: after 32 weeks of treatment

  4. The effect of Cemdisiran on LDH response as measured by LDH

    Time frame: after 32 weeks of treatment

  5. The effect of Cemdisiran on LDH response as measured by rescue plasma therapy

    Time frame: after 32 weeks of treatment

  6. The effect of Cemdisiran on complete Thrombotic microangiopathy (TMA) response as measured by platelet count

    Time frame: after 32 weeks of treatment

  7. The effect of Cemdisiran on complete Thrombotic microangiopathy (TMA) response as measured by LDH

    Time frame: after 32 weeks of treatment

  8. The effect of Cemdisiran on complete Thrombotic microangiopathy (TMA) response as measured by serum creatinine levels

    Time frame: after 32 weeks of treatment

  9. The effect of Cemdisiran on complete Thrombotic microangiopathy (TMA) response as measured by rescue plasma therapy

    Time frame: after 32 weeks of treatment

  10. The effect of Cemdisiran on serum creatinine levels

    Time frame: up to 84 weeks

  11. The effect of Cemdisiran on estimated glomerular filtration rate (eGFR)

    Time frame: up to 84 weeks

  12. The effect of Cemdisiran on adverse events (AEs)

    Time frame: up to 108 weeks

07

Study locations

12 sites
  • Clinical Trial Site
    Sarajevo, Bosnia and Herzegovina
  • Clinical Trial Site
    Calgary, T2N 2T9, Canada
  • Clinical Trial Site
    Tallinn, Estonia
  • Clinical Trial Site
    Tartu, Estonia
  • Clinical Trial Site
    Tbilisi, Georgia
  • Clinical Trial Site
    Riga, Latvia
  • Clinical Trial Site
    Kaunas, Lithuania
  • Clinical Trial Site
    Vilnius, Lithuania
  • Clinical Trial Site
    Skopje, Macedonia, The Former Yugoslav Republic of
  • Clinical Trial Site
    Chisinau, Moldova, Republic of
  • Clinical Trial Site
    Belgrade, Serbia
  • Clinical Trial Site
    Örebro, Sweden
08

References and documents

Individual participant data

Plan to share: Undecided

No publications or documents are linked to this record.

09

Timeline

Tracking since Sep 25, 2026
ElapsedEstimatedEstimated, not yet reached

Ran from Sep 2017 to primary completion in Sep 2018, 11 months.

How these figures are worked out, and which studies are left out of them.

Registered
Sep 25, 2017
First posted
Oct 6, 2017
StartActual
Sep 19, 2017
Primary completionActual
Sep 12, 2018
CompletionActual
Sep 12, 2018
Last update
Oct 1, 2018
What these dates mean
Start.
When the first participant enrolled; while estimated, when the study expects to open to recruitment.
Primary completion.
When the last participant was examined or treated to collect data for the study's main question, its primary outcome. A study that stopped early gives the date its data collection stopped.
Completion.
When the last participant's last visit took place, for every outcome, secondary ones and side effects included: the end of the study. Often later than primary completion, sometimes the same day.
Actual and Est.
Actual means the registry says the date has happened. Est. (estimated) is a date the sponsor plans or expects. It can still move, and the sponsor is expected to change it to actual once it has passed.
No changes since tracking began. The registry record was last updated on Oct 1, 2018, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT03303313
Responsible party
Sponsor
First posted
Oct 6, 2017
Start date
Sep 19, 2017
Primary completion
Sep 12, 2018
Completion
Sep 12, 2018
Last update
Oct 1, 2018

Study contacts

Nader Najafian, MD
study director · Alnylam Pharmaceuticals

Oversight

Data monitoring committee
Yes
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is withdrawn, as verified in Sep 2018. You cannot join it, but the record below documents what was studied.

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Studies of the drug tested here: Cemdisiran

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