Adverse drug reactions are appreciably harmful or unpleasant reactions resulting from an intervention related to the use of medical products, which predicts hazard from future administration and warrants prevention or specific treatment, or alteration of the dosage regimen, or withdrawal of the product. Given medical case reports extracted from MEDLINE, the task is to classify whether the case report mentions the presence of any adverse drug reaction. Classify your answers into non-adverse drug event and adverse drug event.

Q: None of these patients experienced a relapse of their PTLD with follow-up ranging from 1.5 to 5 years.

A: non-adverse drug event
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Q: Allergic contact dermatitis from 4-chloro-7-nitrobenzofurazan.

A: adverse drug event
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Q: We describe 3 AS patients treated with etanercept for active AS who developed new onset of CD while AS related symptoms responded well to etanercept.

A:
adverse drug event
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