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.
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Question: Coexistence of chronic myelogenous leukemia and chronic lymphocytic leukemia.

Answer: non-adverse drug event


Question: Endometrial "sarcomas" complicating ovarian thecoma, polycystic ovarian disease and estrogen therapy.

Answer: non-adverse drug event


Question: A manual pumping test is commonly used to verify the patency of a ventriculoperitoneal (V-P) shunt.

Answer:
non-adverse drug event