Not reported in the public reviews. Reviewers summarise selectively, so this usually means it wasn't discussed publicly, not that it wasn't studied.
Reviewer's view of the efficacy data
EMA: proof-of-concept in the GEM model sufficient; optimal efficacious dose not determinable
“Tumour volume and cell proliferation biomarkers were reduced; however, the most efficacious levels could not be determined as the three dose levels resulted in similar response amplitudes. The proof-of-concept in this genetically modified mouse model could be considered sufficient to support the intended indication.”