The Primary Objective of This Study is to Evaluate Efficacy and Safety of AVTX-803 in Patients With Leukocyte Adhesion Deficiency Type II
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ClinicalTrials.gov Identifier: NCT05462587 |
Recruitment Status :
Recruiting
First Posted : July 18, 2022
Last Update Posted : August 5, 2022
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Condition or disease | Intervention/treatment | Phase |
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Leukocyte Adhesion Deficiency | Drug: AVTX-803 (L-Fucose) | Phase 3 |
Study Type : | Interventional (Clinical Trial) |
Estimated Enrollment : | 4 participants |
Allocation: | Randomized |
Intervention Model: | Crossover Assignment |
Masking: | Double (Participant, Investigator) |
Primary Purpose: | Treatment |
Official Title: | A Phase 3, Randomized, Double-blind, Two-period, Crossover, Withdrawal Study to Assess the Efficacy and Safety of AVTX-803 in Subjects With Leukocyte Adhesion Deficiency Type II (LAD II) |
Actual Study Start Date : | July 28, 2022 |
Estimated Primary Completion Date : | December 31, 2022 |
Estimated Study Completion Date : | December 31, 2022 |

Arm | Intervention/treatment |
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Experimental: AVTX-803
Approximately 4 subjects will receive AVTX-803 at a dose specified by the investigator up to 5 times a day not to exceed 1700 mg/kg/day for 8 weeks.
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Drug: AVTX-803 (L-Fucose)
L-fucose crystalline powder |
No Intervention: Withdrawal
Subject will be in withdrawal for 8 weeks.
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- Effect of AVTX-803 on the percent of leukocytes expressing Sialyl-Lewis X antigen [ Time Frame: Change from Baseline at Day 56, Change from Baseline at Day 112 ]To assess the effect of AVTX-803 in subjects with leukocyte adhesion deficiency Type II (LAD II) by evaluating Sialyl-Lewis X on leukocytes as a percentage present at the end of each 8 week treatment period.

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Ages Eligible for Study: | 6 Months to 75 Years (Child, Adult, Older Adult) |
Sexes Eligible for Study: | All |
Accepts Healthy Volunteers: | No |
Inclusion Criteria:
- Subject must be between 6 months and 75 years old
- Subject has biochemically and genetically proven LAD II (SLC35C1-CDG)
- Subject has a documented history of Lewis antigen deficiency
- Subject has a history of recurrent infections, opportunistic infections or infections that did not respond well to standard of care treatment
- Subject or parent (for subjects under legal age for consent) has provided written informed consent for this study. Additionally, written informed assent has been provided, as appropriate, for minors of older age, per local institutional review board (IRB)/ethics committee (EC) policy and requirements
- Subject is willing and able to comply with the protocol
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Women of childbearing potential (WOCBP) meeting the criteria below:
- Non-lactating and has a negative pregnancy test at screening -AND-
- Uses an acceptable double-barrier method of contraception as determined by the investigator or sub-investigator for the duration of the study and 30 days following the last dose of study drug.
- Male subjects must agree to use an acceptable double-barrier method of contraception with their partner as determined by the investigator or sub-investigator for the duration of the study and 30 days following the last dose of study drug.
Exclusion Criteria:
- Subject has severe anemia defined as hemoglobin <8.0 g/dL (<4.9 mmol/L)
- Subject has impaired renal function as defined by an eGFR <90 mL/min
- Subject has a total absence of fucosylation on red blood cells and the presence of anti-H antigen
- Subject has known or suspected intolerance or hypersensitivity to fucose or any ingredients of the investigational product
- In the investigator's opinion, subject has a history of failure to respond to fucose at adequate dosing
- In the investigator's opinion, subject is not able or not willing to comply with the study requirements.
- Subject is pregnant

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 ClinicalTrials.gov identifier (NCT number): NCT05462587
Contact: John Boland | 6102544201 | jboland@avalotx.com | |
Contact: Emily Cooke | 4845885264 | ecooke@avalotx.com |
United States, Minnesota | |
Mayo Clinic | Recruiting |
Rochester, Minnesota, United States, 55905 | |
Contact: Eva Morava-Kozicz, MD PhD |
Responsible Party: | Avalo Therapeutics, Inc. |
ClinicalTrials.gov Identifier: | NCT05462587 |
Other Study ID Numbers: |
AVTX-803-LAD-301 |
First Posted: | July 18, 2022 Key Record Dates |
Last Update Posted: | August 5, 2022 |
Last Verified: | August 2022 |
Individual Participant Data (IPD) Sharing Statement: | |
Plan to Share IPD: | No |
Studies a U.S. FDA-regulated Drug Product: | Yes |
Studies a U.S. FDA-regulated Device Product: | No |
Leukocyte-Adhesion Deficiency Syndrome Tissue Adhesions Cicatrix Fibrosis Pathologic Processes |
Primary Immunodeficiency Diseases Genetic Diseases, Inborn Immunologic Deficiency Syndromes Immune System Diseases |