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2016 ; 33
(3
): e8-e12
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Successful rhIGF1 treatment for over 5 years in a patient with severe insulin
resistance due to homozygous insulin receptor mutation
#MMPMID26262567
Carmody D
; Ladsaria SS
; Buikema RK
; Semple RK
; Greeley SA
Diabet Med
2016[Mar]; 33
(3
): e8-e12
PMID26262567
show ga
BACKGROUND: Congenital insulin resistance syndromes are caused by biallelic
mutations within the insulin receptor gene (INSR). Recombinant human insulin-like
growth factor (rhIGF1) has been used with mixed success; however, rigorous
assessment of its efficacy is lacking. Here, we describe a child with a
homozygous mutation in INSR successfully treated with rhIGF1 for more than 5
years. CASE REPORT: The patient presented with osmotic diabetes symptoms and was
noted to have dysplastic dentition, hypertrichosis, coarse and dysmorphic facial
features. Acanthosis nigricans, skin tags and rugated hyperkeratosis were also
evident on the posterior neck, axilla and groin. A homozygous INSR essential
splice site mutation (c.1268 + 2T > C, p.G374 fs*12) was identified, for which
both parents were found to be heterozygous. The patient was treated with twice
daily injections of rhIGF1 and metformin for more than 5 years with improvement
in her acanthosis nigricans, hyperkeratosis and hypertrichosis. A dramatic fall
in fasting insulin, HOMA-IR and HbA1c has been maintained over the entire course
of treatment without adverse effects. Her linear growth velocity has remained on
target for her predicted adult height. DISCUSSION: Our case demonstrates the
effectiveness of rhIGF1 as an early treatment in a patient with a biallelic
mutation within INSR without evidence of fluid retention, retinopathy, muscle
pain, heart failure, cerebral infarcts or benign intracranial hypertension. Her
case suggests rhIGF1 can and should be considered as an initial treatment option
instead of as a final option in those with INSR mutations.