This is a FIH, Phase 1, open-label, multicenter, multiple-dose, dose escalation and expansion study. This study includes 2 parts: a Dose Escalation and Backfill portion (Part A) and a Dose Expansion portion (Part B). NEOK001 is a bispecific B7-H3 x ROR1 exatecan antibody-drug conjugate (ADC) that will be administered intravenously once every cycle.