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EQA-LSD External Q uality A ssessment Enzyme Analysis for L ysosomal S torage D iseases

Explore reproducibility results of enzyme activities in fibroblasts for lysosomal storage diseases. Analyze 14 key enzymes measured in 2013 EQA with CV statistics.

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EQA-LSD External Q uality A ssessment Enzyme Analysis for L ysosomal S torage D iseases

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  1. Pilots “large scale” 2006 (36) 2007 (46) 2008 (55) 2009 (59), DBS (27) 2010 (58) 2011 (61) 2012 (64) 2013 (71) EQA-LSD External Quality Assessment Enzyme Analysis for Lysosomal Storage Diseases

  2. ENZYMES 2013 PROFICIENCY TESTINGFIBROBLASTS Hurler/Scheie (MPS I) α-L-iduronidase Krabbe Galactocerebrosidase LF2 Niemann Pick A/B Sphingomyelinase LF4 Fabry α-galactosidase Gaucherβ-Glucosidase Sanfilippo A Heparansulphate sulphamidase LF6 MPS VI, Arylsulphatase B GM1(Morquio B) β-Galactosidase GM2 β-Hexosaminidase A+B LF1 Pompeα-Glucosidase LF 3 + 5 control Fibroblasts used for determination CV 2

  3. RESULTS 2013 NUMBER OF ENZYMES MEASURED 3

  4. Reproducibility of protein/vial 2013duplicate samples Fibroblasts Mean CV 15.5±27.7 % 4

  5. Reproducibility of Arylsulfatase B 2013duplicate samples Fibroblasts D+ enzyme activity other samples < 20 % control Fibroblasts Mean CV 35 ± 36 % D incorrect 2% 5

  6. Reproducibility of α-Galactosidase 2013duplicate samples Fibroblasts Mean CV 16 ± 15 % D incorrect 0% 6

  7. Reproducibility of β-Galactosidase 2013duplicate samples Fibroblasts D+ enzyme activity other Fibroblast < 20 % control Fibroblast Mean CV 29 ± 36 % D incorrect 3% 7

  8. Reproducibility of α-Glucosidase 2013duplicate samples Fibroblasts D+ enzyme activity other Fibroblast< 20 % control Fibroblast Mean CV 27 ± 28 % D incorrect 5 % 8

  9. Reproducibility of β-Glucosidase 2013duplicate samples Fibroblasts Mean CV 27 ± 30 % D incorrect 0% 9

  10. Reproducibility of β-Hexosaminidase A+B 2013duplicate samples Fibroblasts D+ enzyme activity other Fibroblast < 20 % control Fibroblast D0 patient sample not measured Mean CV 28 ± 33 % D incorrect 8% 10

  11. Reproducibility of α-Iduronidase 2013duplicate samples Fibroblasts D+ enzyme activity other Fibroblast < 20 % control Fibroblast Mean CV 30 ± 35 % D incorrect 2 % 11

  12. Reproducibility of Heparansulphate sulphamidase 2013 duplicate samples Fibroblasts D- enzyme activity patient sample > 30% control Fibroblast D+ enzyme activity other Fibroblast < 20 % control Fibroblast D0 patient sample not measured Mean CV 33 ± 44 % D incorrect 26% 12

  13. Reproducibility of Galactocerebrosidase 2013duplicate samples Fibroblasts D- enzyme activity patient sample > 30% control Fibroblast D+ enzyme activity other Fibroblast< 20 % control Fibroblast D0 patient sample not measured Mean CV 38± 35 % D incorrect 33% 13

  14. Reproducibility of Sphingomyelinase 2013duplicate samples Fibroblasts D- enzyme activity patient sample > 30% control Fibroblast D+ enzyme activity other Fibroblast < 20 % control Fibroblast D0 patient sample not measured Mean CV 44 ± 63 % D incorrect 10% 14

  15. OVERALL PERFORMANCE 2013 10 Participants: 100% score, CV<25%; enzyme patient<30%; enzyme control >20% 44 Participants: no false negative of positive patients 15

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