OXTR and breast neoplasm: 111In-labelled OT-like tracer 111In-DOTA-LVT (111In-1,4,7,10-tetraazacyclododecane-N,N’,N”,N”’-tetraacetic acid-Lys8-vasotocin) [100], and its improved version 111In-DOTA-dLVT (111In-1,4,7,10-tetraazacyclododecane-N,N’,N”,N”’-tetraacetic acid-Lys8-deamino-vasotocin) [101] were developed to visualise OTR-expressing breast tumours and to study tracer/ligand uptake in mouse xenograft models.