ESPE Abstracts (2015) 84 P-3-959

ESPE2015 Poster Category 3 GH & IGF (68 abstracts)

Late Diagnosis of a Type II/III Mucolipidoses Treated with GH Replacement Therapy

Iulia Crumpei a, , Alina Belceanu a, , Ioana Armasu a, , Elena Braha a, , Cristina Rusu a, , Adina Manolachie a, , Zmau George a, , Cristina Preda a, & Carmen Vulpoi a,

aUniversity of Medicine and Pharmacy Gr T Popa, Iasi, Romania; bEndocrinology Department, Sfantul Spiridon University Hospital, Iasi, Romania; cDepartment of Human Genetics, Sfanta Maria Hospital, Iasi, Romania

Background: Mucolipidoses II/III (ML) are rare autosomal recessive lysosomal storage disorders (incidence: 1/325 000 live births). They have overlapping clinical phenotypes with mucopolysaccharidosis disorders and include growth retardation, facial dysmorphism, skeletal abnormalities, respiratory and heart diseases, hepatosplenomegaly and abdominal hernias. There is no specific treatment and the management has been limited to supportive care.

Case presentation: A.M., aged 18, boy of an young non-consanguineous apparently healthy couple, suspected by the Genetics Department for mucopolysaccharidosis, was first addressed to the Endocrinology Department at the age of 14 years 4 months for investigations of growth retardation. The clinical examination revealed short stature (−4 S.D.), ‘elf’ facies, limited extension and abduction of the upper limbs with bilateral tendon retraction of the fingers and also in the radiocarpal and elbow joints, decreased mobility of the spine and waddling walk with wide support base; no signs of pubertal onset. Wrist radiography revealed delayed bone age of ~6 years. Somatotropic axis investigations revealed low IGF1 (62.4 ng/ml, N=220–972, GH=0.42 ng/ml, without stimulation at the arginine test: GH=2.75 ng/ml) pleading for GH deficiency. Since there were not known contraindications, GH replacement therapy was started with an initial dose of 0.035 mg/kg per day followed by biannual reassessments. After 4 years of treatment the medium growth rate was 0.42 cm/month and no side effects were reported. The last wrist radiography revealed delayed bone age (11 years 6 months) permitting treatment continuation. Further investigations (the enzymes α-iduronidase, iduronate-2-sulfatase, arylsulfatase B, β-galactosidase) confirmed MLII/III.

Conclusions: Corroborating the clinical phenotype, biological data and evolution, this case can be included in MLIII. We haven’t found in the literature any case of MLIII treated with GH replacement therapy. In our case the treatment was effective and improved the patient’s quality of life.

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