Cross-reactive immunologic material status affects treatment outcomes in Pompe disease infants.
Deficiency of acid alpha glucosidase (GAA) causes Pompe disease, which is usually fatal if onset occurs in infancy. Patients synthesize a non-functional form of GAA or are unable to form native enzyme. Enzyme replacement therapy with recombinant human GAA (rhGAA) prolongs survival in infantile Pompe patients but may be less effective in cross-reactive immunologic material (CRIM)-negative patients. We retrospectively analyzed the influence of CRIM status on outcome in 21 CRIM-positive and 11 CRIM-negative infantile Pompe patients receiving rhGAA. Patients were from the clinical setting and from clinical trials of rhGAA, were 6 months of age, were not invasively ventilated, and were treated with IV rhGAA at a cumulative or total dose of 20 or 40 mg/kg/2 weeks. Outcome measures included survival, invasive ventilator-free survival, cardiac status, gross motor development, development of antibodies to rhGAA, and levels of urinary Glc(4). Following 52 weeks of treatment, 6/11 (54.5%) CRIM-negative and 1/21 (4.8%) CRIM-positive patients were deceased or invasively ventilated (p<0.0001). By age 27.1 months, all CRIM-negative patients and 4/21 (19.0%) CRIM-positive patients were deceased or invasively ventilated. Cardiac function and gross motor development improved significantly more in the CRIM-positive group. IgG antibodies to rhGAA developed earlier and serotiters were higher and more sustained in the CRIM-negative group. CRIM-negative status predicted reduced overall survival and invasive ventilator-free survival and poorer clinical outcomes in infants with Pompe disease treated with rhGAA. The effect of CRIM status on outcome appears to be mediated by antibody responses to the exogenous protein.
Kishnani
Priya S
PS
Department of Pediatrics, Division of Medical Genetics, Duke University Medical Center, Box 103856 DUMC, 4th Floor GSRBI, 595 LaSalle Street, Durham, NC 27710, USA. kishn001@mc.duke.edu
Goldenberg
Paula C
PC
DeArmey
Stephanie L
SL
Heller
James
J
Benjamin
Danny
D
Young
Sarah
S
Bali
Deeksha
D
Smith
Sue Ann
SA
Li
Jennifer S
JS
Mandel
Hanna
H
Koeberl
Dwight
D
Rosenberg
Amy
A
Chen
Y-T
YT
D003429:Cross Reactions; D056947:Enzyme Replacement Therapy; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006009:Glycogen Storage Disease Type II / Q000188:drug therapy* / Q000276:immunology / Q000503:physiopathology; D006801:Humans; D007074:Immunoglobulin G / Q000097:blood; D007223:Infant; D008297:Male; D053580:Muscle Strength / Q000187:drug effects; D011994:Recombinant Proteins / Q000627:therapeutic use; D012189:Retrospective Studies; D016896:Treatment Outcome; D000519:alpha-Galactosidase / Q000235:genetics / Q000276:immunology / Q000627:therapeutic use*
D007074:Immunoglobulin G; D011994:Recombinant Proteins; D000519:alpha-Galactosidase