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Treatment Protocol for Use of Anascorp™ in Patients With Scorpion Sting Envenomation

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00624078
Recruitment Status : Completed
First Posted : February 26, 2008
Last Update Posted : February 23, 2011
University of Arizona
Information provided by:
Instituto Bioclon S.A. de C.V.

Brief Summary:

This treatment protocol will enable therapeutic use of Anascorp in the management of systemic manifestations of scorpion sting envenomation, in patients for whom antivenom would otherwise be unavailable. The working hypotheses are as follows:

  1. The investigational antivenom is safe as treatment of scorpion sting envenomation.
  2. The investigational antivenom is effective as treatment of scorpion sting envenomation.

Condition or disease Intervention/treatment Phase
Scorpion Sting Envenomation Drug: Antivenin Centruroides (scorpion) F(ab)2 Anascorp™ Phase 2 Phase 3

Detailed Description:

The purpose of this Open Label, Multi-Center Treatment Protocol, phase III trial is to examine the safety and efficacy of Anascorp, for treatment of patients envenomed by scorpion sting.

The treatment protocol, including up to 25 Arizona sites, increases the total number of subjects receiving Anascorp™, and can provide supplemental safety data for the review process. At the same time, it will prevent a public health crisis in rural Arizona by replacing the dwindling supply of local antivenom before an BLA is approved.

Patients who arrive at the emergency clinic presenting with scorpion sting symptoms will be evaluated for treatment with Anascorp.

Each patient who qualifies for entry into the study, according to inclusion/exclusion criteria, is assigned a patient number in sequential order of entry. Approximately 100 patients could be enrolled in the study per year.

After informed consent has been obtained, a baseline history and physical will be obtained and documented in the patient's chart. This will include an evaluation of the symptoms of systemic scorpion envenomation. The patient's vital signs (blood pressure, pulse and respiration) will be taken. The patient will be questioned as to concomitant medications. Demographic data will also be collected.

Three vials of Anascorp will be administered in a total volume of 50 mL, intravenous over not less than 10 minutes or as permitted by IV access. If clinically indicated by systemic signs, a second dose (one vial) will be administered if clinically indicated by systemic signs. One additional dose may be administered 30 minutes later if indicated by clinically significant signs of envenomation. When clinically significant signs have been absent for at least 30 minutes, a final physical assessment will take place and the patient will be discharged to home.

Twenty four hours and fourteen days after Anascorp™ treatment, all patients will be monitored for signs and symptoms of adverse events, including acute hypersensitivity reactions (anaphylactic and/or anaphylactoid reactions) and delayed serum sickness. All patients who received study drug will be included in the final analyses.

For the individual patient, the study starts at the time the consent is signed and ends at the 14 day telephone interview. The outcome is assessed 14 days after discharge by telephone interview.

Concomitant therapy and medications may be used at any time as needed. All concomitant medication must be documented in the CRF from time of entry into the study until the 14 day follow up telephone interview..

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 1426 participants
Allocation: N/A
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: Treatment Protocol for Use of Anascorp™ in Patients With Scorpion Sting Envenomation
Study Start Date : May 2005
Actual Primary Completion Date : September 2010
Actual Study Completion Date : September 2010

Arm Intervention/treatment
Experimental: 1
Patients who arrive to emergency room with scorpion sting envenomation will be evaluated according to inclusion/exclusion criteria. After informed consent has been signed they will be assigned to unique treatment arm with Anascorp.
Drug: Antivenin Centruroides (scorpion) F(ab)2 Anascorp™
three vials diluted in 20 to 50 mL normal saline administered intravenously. Subsequent single vial doses of Anascorp, up to a total of five vials administered at thirty minutes intervals until resolution of symptoms.

Primary Outcome Measures :
  1. Evaluate the adverse events profile of each patient [ Time Frame: immediately after treatment, 24 hrs and 14 days. ]

Secondary Outcome Measures :
  1. Resolution of systemic signs of scorpion envenomation [ Time Frame: after treatment ]

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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Ages Eligible for Study:   Child, Adult, Older Adult
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Males and females of any age presenting for emergency treatment with clinically important systemic signs of scorpion sting envenomation
  • Signed written Informed Consent by patient or legal guardian

Exclusion Criteria:

  • Allergy to horse serum

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00624078

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Sponsors and Collaborators
Instituto Bioclon S.A. de C.V.
University of Arizona
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Principal Investigator: Leslie Boyer, M.D VIPER Institute
Study Chair: Walter Garcia, M.D Instituto Bioclon S.A. de C.V.
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Responsible Party: Walter Garcia U. MD/Clinical Research Manager, Instituto Bioclon Identifier: NCT00624078    
Other Study ID Numbers: AL-03/07
First Posted: February 26, 2008    Key Record Dates
Last Update Posted: February 23, 2011
Last Verified: February 2011
Keywords provided by Instituto Bioclon S.A. de C.V.:
scorpion sting
Additional relevant MeSH terms:
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Bites and Stings
Scorpion Stings
Chemically-Induced Disorders
Wounds and Injuries
Immunologic Factors
Physiological Effects of Drugs