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.

Example Input: Progressive anemia following combination therapy with interferon-alpha and interleukin-2 in a patient with metastatic renal cell carcinoma.
Example Output: adverse drug event

Example Input: The Keyes technique and self-inflicted injuries.
Example Output: non-adverse drug event

Example Input: The use of such chemotherapy regimens in Ewing's tumours should be carefully considered, particularly when radiotherapy encompassing the spinal cord is an essential component of management.
Example Output:
non-adverse drug event