Abstract: The use of a compound of formula (I) or a salt, ester, amide or prodrug thereof; where X is O, or S, S(O) or S(O)2, NH or NR12 where R12 is hydrogen or C1-6 alkyl; R5 is selected from a group NHC(O)OR9, NHC(O)R9, NHS(O)2R9, C(O)R9, C(O)OR9, S(O)R9, S(O)OR9, S(O)2OR9, C(O)NR10 R11, S(O)NR10R11 S(O)ONR10R11, where R9, R10 or R11 are various specified organic groups; R6 is hydrogen, optionally substituted hydrocarbyl or optionally substituted heterocyclyl; R7 and R8 are various specified organic groups, and R1, R2, R3, R4 are independently selected from halogeno, cyano, nitro, C1-3alkylsulphanyl, —N(OH)R13— (wherein R7 is hydrogen, or C1-3alkyl), or R15X1— (wherein X1 represents a direct bond, —O—, —CH2—, —OCO—, carbonyl, —S—, —SO—, —SO2—, —NR16CO—, —CONR16—, —SO2NR16—, —NR17SO2— or —NR18— (wherein R16, R17 and R18 each independently represents hydrogen, C1-3alkyl or C1-3alkoxy C2-3alkyl), and R9 is hydrogen, optionally substituted hydrocarbyl, optionally substituted heterocyclyl or optionally substituted alkoxy

Abstract: A combination comprising an aurora kinase inhibitor and an efflux transporter inhibitor wherein the aurora kinase inhibitor is a compound of formula (I) or pharmaceutically acceptable salt thereof for use in the treatment of hyperproliferative diseases such as cancer.

Abstract: A compound of formula (I) or a salt, ester, amide or prodrug thereof; where X is O, or S, S(O), S(O)2 or NR6 where R6 is hydrogen of C1-6alkyl; R5 is an optionally substituted 6-membered aromatic ring containing at least one nitrogen atom, and R1, R2, R3, R4 are independently selected from halogeno, cyano, nitro, C1-3alkylsulphanyl, —N(OH)R7— (wherein R7 is hydrogen, or C1-3alkyl), or R9X1— (wherein X1 represents a direct bond, —O—, —CH2—, —OC(O), —C(O)—, —S—, —SO—, —SO2—, —NR10C(O)—, —C(O)NR11—, —SO2NR12—, —NR13SO2— or NR14— (wherein R10, R11, R12, R13 and R14 each independently represents hydrogen, C1-3alkyl or C1-3alkoxyC2-3alkyl), and R9 is hydrogen, optionally substituted hydrocarbyl, optionally substituted heterocyclyl or optionally substituted alkoxy; provided that at least one of R2 or R3 is other than hydrogen. These compounds inhibit aurora 2 kinase and are useful in the preparation of medicaments for the treatment of proliferative disease such as cancer.

Abstract: The invention provides crystalline forms of a polypeptide corresponding to the catalytic domain of Aurora kinase. The active site ATP binding pocket is defined by its amino acid residues and their atomic coordinates. This structure may be used to select or design chemical modulators of Aurora kinase, particularly Aurora inhibitors. These modulators may be used to treat diseases of cell proliferation, e.g. cancer.

Abstract: A compound of formula (I) or a salt, ester or amide thereof; where X is O, or S, S(O) or S(O)2 or NR10 where R10 is hydrogen or C1-6 alkyl, and R1, R2, R3, R4, R5, R6, R7, R8 and R9 are various specified organic groups. These compounds are inhibitors of aurora 2 kinase, and are useful in the treatment of cancer.

Abstract: The use of a compound of formula (I) or a salt, ester or amide thereof; where X is O, or S, S(O) or S(O)2, NH or NR8 where R8 is hydrogen or C1-6alkyl; Ra is a 3-quinoline group or a group of sub-formula (i) where R5, R6 and R7 are various specific organic groups, in the preparation of a medicament for use in the inhibtion of aurora 2 kinase. Novel compounds of formula (I) and pharmaceutical compositions useful in the treatment of cancer are also described and claimed.