Soc. 110:6558-6560, 1988), or obtained from a variety of commercial sources, including for example, Sigma Chemical Co., St. Louis, Mo. (T7402-from Taxus brevifolia).??? The entire disclosure of each of the United States patents described in this paragraph of the specification is hereby incorporated by reference into this specification. [0753] Paclitaxel derivatives and/or analogues are also drugs