This invention relates to a method of treating
cancer, and particularly a method including the steps of administering to a
mammal in need of such treatment, either simultaneously or sequentially, (i) a compound selected from a
paclitaxel and
docetaxel, and (ii) a compound of the formula or a pharmaceutically acceptable salt or ester thereof; wherein R1, R2 and R3 are each independently selected from the group consisting of H, C1-C6
alkyl,
halogen, CF3, CN, NO2, NH2, OH, OR, NHCOR, NHSO2R, SR, SO2R or NHR, wherein each R is independently C1-C6
alkyl optionally substituted with one or more substituents selected from hydroxy, amino and methoxy, and wherein each of R1, R2 and R3 may be present at any of the available positions 1 to 8; and wherein in each of the carbocyclic aromatic rings in formula (I), up to two of the methine (-CH=) groups may be replaced by an aza (-N=) group; and wherein any two of R1, R2 and R3 may additionally together represent the group -CH =CH.CH =CH-, such that this group, together with the carbon or
nitrogen atoms to which it is attached, forms a fused 6 membered aromatic ring.