An antibody-drug conjugate (ADC) directed against the fibroblast growth factor receptor type 2 (FGFR2) and conjugated to an as of yet unidentified toxin, with potential antineoplastic activity. Upon intravenous administration, the anti-FGFR2 ADC BAY1187982 binds to FGFR2. Upon binding, the toxin selectively induces cell death, through an as of yet undisclosed mechanism of action, in FGFR2-expressing tumor cells. FGFR2, a receptor tyrosine kinase upregulated in many tumor cell types, plays an essential role in tumor cell proliferation, differentiation and survival.