Based on phase II and III trials Taxol administered in the form of three times/week 1 or 3 hr infusion as mono-or combined chemotherapy of breast cancer is an effective treatment option. These studies proved that this form of drug delivery is effective and well tolerated and the overall response rate is around 50%. The 1 hr weekly infusion of Taxol is an effective second-line treatment in metastatic breast cancer and is better than the 3-weekly infusion since the decreased toxicity increases the therapeutic index.