The standard chemotherapy for ovarian carcinoma is paclitaxel and carboplatin concomitant therapy. This combination is so frequently administered that a carboplatin-associated hypersensitivity reaction may occur after long-term treatment. Recently, we experienced carboplatin-associated hypersensitivity reactions in three cases. They showed symptoms of tachycardia, chest tightness, and dyspnea. We report these cases that could be readministered platinum agent using the cisplatin desensitization method. This method was relatively safe and successful for patients with platinum-sensitive disease.