Additional Relevant Details In the multicenter, open-label, Phase 1 trial, TTI-621 will be delivered by intratumoral injection in patients with relapsed and refractory, percutaneously-accessible cancers. Patients will be enrolled in sequential dose cohorts to receive intratumoral injections of TTI-621 that increase in dose and dosing frequency to characterize safety, pharmacokinetics, pharmacodynamics and preliminary evidence of antitumor activity. In addition, detailed evaluation of serial, on-treatment tumor biopsies of both injected and non-injected cancer lesions will help characterize tumor microenvironment changes anticipated with CD47 blockade.