Safely Stopping Pre-medications in Patients With Breast Cancer Who Are Receiving Paclitaxel

PRIMARY OBJECTIVE: I. To estimate the difference in rates of infusion hypersensitivity reaction (HSR) requiring parenteral rescue medications following the discontinuation of pre-medications after 2 doses of paclitaxel, compared to continuing premedications, in breast cancer patients who have not experienced an infusion HSR with their first 2 paclitaxel doses. OUTLINE: Patients receive paclitaxel per standard of care as a single agent or in combination with dexamethasone intravenously (IV) and/or orally (PO), diphenhydramine IV and/or PO and either famotidine IV and/or PO, ranitidine IV and/or PO or cimetidine IV and/or PO. Patients who don't experience any infusion hypersensitivity reaction after the first 2 doses of paclitaxel are randomized to 1 of 2 arms. ARM I (STANDARD OF CARE): Patients continue on pre-medications (dexamethasone, diphenhydramine, famotidine/ranitidine/cimetidine) with all future doses of paclitaxel. ARM II (EXPERIMENTAL): Patients discontinue premedications (dexamethasone, diphenhydramine, famotidine/ranitidine/cimetidine) with all future doses of paclitaxel, unless patient develops a subsequent infusion HSR.