This study consists of two phases. The phase I study is designed to investigate the safety and tolerability of Satoreotide tetraxetan following fractionated i.v. administrations in pre-treated subjects with locally advanced or metastatic cancers expressing sstr2 as identified by Satoreotide trizoxetan Positron Emission Tomography (PET/CT) scans. This phase will encompass both radioactivity escalation and peptide mass dose evaluation. Phase II will assess the efficacy of Satoreotide tetraxetan in subjects in selected indications, in a basket design.