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: Primary CNS lymphoma regressed on withdrawal of MM.

A: adverse drug event
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Q: The authors describe a 6-year-old boy who developed pulmonary tuberculosis during intensive chemotherapy for acute myeloblastic leukemia (AML).

A: non-adverse drug event
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Q: Pigmentary aberrations are well known side effects of cytostatic chemotherapeutic agents.

A:
non-adverse drug event
****