The invention provides a combination comprising : (i) a compound of formula (Io) : (Io) or a tautomer or a solvate or a pharmaceutically acceptable salt thereof, wherein the various substituents are as defined in the claims; and (ii) a compound which is SGI-110 (SGI-110) or a tautomer or a solvate or a pharmaceutically acceptable salt thereof. Also provided are pharmaceutical compositions containing the combinations and medical uses of the combinations.