4h-pyrrolo[3,2-c]pyridin-4-one derivatives

Compounds of formula (I) for use in the treatment or prophylaxis of a disease, which is a hyperproliferative disease and/or a disorder responsive to induction of cell death, selected from a haematological tumour, a solid tumour and/or metastases thereof, said tumour harbouring a mutant EGFR with exon 19 or 21 mutations, and their use as pharmaceuticals.