True hypoglycaemia secondary to treatment with granulocyte colony stimulating factor (G-CSF) in a diabetic patient with non-small cell lung cancer.

We report the case of a 61-year-old man with non-small lung cancer with poorly controlled type 2 diabetes mellitus who developed clinically significant hypoglycaemia secondary to a first exposure to granulocyte colony stimulating factor (G-CSF) injections. Whilst artefactual hypoglycaemia during treatment with G-CSF is well recognised, to our knowledge, this is the first report revealing that it can provoke true hypoglycaemia in the absence of leucocytosis.