Laboratory data showed fasting hypoglycemia, and the results were as follows: serum blood glucose at 1.25 mmol/L (normal range: 3.89–6.11 mmol/L), serum insulin level at <3.48 pmol/L (normal range: 17.8–173.0 pmol/L), C-peptide at 0.03 nmol/L (normal range: 0.27–1.28 nmol/L), IGF-2 at 1,964.33 ng/ml (normal range: 400–736 ng/ml), IGF-1 at <25.0 ng/ml (normal range: 94.0–252 ng/ml), pro-IGF-2 at 28.79 ng/ml, and IGF-2/IGF-1 >10. Here, IGF1 is linked to Hypoglycemia.