For women with recurrent ovarian cancer, re-treatment with carboplatin is frequently recommended. However, carboplatin re-treatment can result in an allergic or allergic-like reaction called a hypersensitivity reaction. Symptoms of a hypersensitivity reaction can include, but are not limited to itching, rash, swelling of the lips, tongue, or throat, chest pain, chest tightness, shortness of breath, wheezing, abdominal pain, nausea, vomiting, diarrhea, palpitations, dizziness, confusion, and low pressure. Hypersensitivity reactions occur in 20-40% of women with recurrent ovarian cancer who are re-treated with carboplatin. At least half of the hypersensitivity reactions are described as moderately severe with symptoms of generalized rash, wheezing, facial swelling, difficulty breathing/shortness of breath, and hypotension (low blood pressure).