What is the definition or description of: elspar allergy?

Elspar allergy: Elspar (Asparaginase) is one part of chemotherapy combination used in the treatment of acute lymphoblastic leukemia (ALL). An allergy occurs when your body’s immune system creates antibodies to a foreign substance causing a reaction that can be mild to severe. For potential adverse reactions see: http://www.rxlist.com/elspar-drug.htm