The present invention relates to compounds of formula (Ia), or a pharmaceutically acceptable salt or solvate thereof, (Ia) wherein: ring A is a 5- or 6-membered monocyclic aromatic or heteroaromatic ring, or a 9- or 10-membered bicyclic aromatic or heteroaromatic ring, each of which is optionally substituted with one or more substituents selected from F, Cl, Br, I, CN, alkoxy, NR11R11′, OH, SO2-
alkyl, CO2-
alkyl,
alkyl, haloalkyl, aralkyl,
aryl, and heteroaryl, and wherein said
aryl and heteroaryl substituents are in turn optionally substituted with one or more substituents each independently selected from F, Cl, Br, I, CN, alkoxy, NR11R11′, OH, alkyl, haloalkyl, and aralkyl; ring B is a monocyclic or bicyclic heteroaromatic group containing at least one
nitrogen atom, which is optionally substituted by one or more substituents selected from halo, CN, alkyl, alkoxy, haloalkyl, haloalkoxy, cycloalkyl, heterocycloalkyl,
aryl, heteroaryl, CO2-alkyl, O-aryl, NR11R11′, CONR16R17 and SO2NR16R17; Y and Z are each independently CR10R10′, wherein R10 and R10′ are each independently selected from H, F, alkyl, and haloalkyl; and R11 and R11′ are each independently selected from H, alkyl, haloalkyl, COR12, and SO2R13, wherein R12 and R13 are each independently alkyl; R16 and R17 are each independently selected from H and alkyl; P wherein the compound is other than 6-fluoro-N-(5-(
trifluoromethyl)-1,3,4-thiadiazol-2-yl)-3,4-dihydroisoquinoline-2(1H)-
carboxamide. Further aspects of the invention relate to such compounds for use in the field of immuno-
oncology,
immunology, and related applications.