A Phase 1a/1b, Multicenter, Open-Label, First-in-Human Study to Assess the Safety, Tolerability, Pharmacokinetics, and Preliminary Antitumor Activity of DB-1317 in Participants With Selected Advanced/Metastatic Solid Tumors

Phase 1a (Dose Escalation and Backfilling) Approximately 5 increasing dose levels of DB-1317 dosing every 3 weeks (Q3W) will be evaluated using an accelerated titration design at the first dose level, followed by a BOIN design at subsequent dose levels with the oversight of a Safety Monitoring Committee (SMC). For safety reasons, in any dose level of the dose escalation where a number of participants ≥ 2, a staggered dosing is required. The second participant in each dose level should start dosing no sooner than at least 24 hours after the initial dosing of the first participant. If no safety…