A Study to Assess Safety, Tolerability and Imaging Characteristics of [68Ga]Ga-DPI-4452 and to Assess Safety, Tolerability, and Efficacy of [177Lu]Lu-DPI-4452 in Participants With Unresectable Locally Advanced or Metastatic Solid Tumors

The main purpose of Part A of the study is to evaluate safety, tolerability and tracer uptake after a single intravenous (IV) administration of [68Ga]Ga-DPI-4452; Part B: is to determine the recommended phase 2 dose (RP2D) [maximum tolerated dose (MTD) or lower dose] for [177Lu]Lu-DPI-4452 for each tumor type; Part C: is to evaluate the preliminary antitumor activity of [177Lu]Lu-DPI-4452 as monotherapy.