This is a single arm, open label, dose escalation clinical study to evaluate the safety and preliminary therapeutic efficacy of CCT303-406 cells in adult subjects with HER2 positive relapsed or refractory stage IV metastatic solid tumors.~Subjects that meet inclusion criteria with positive biopsy HER2 (IHC 3+ in ≥50% tumor cells) will receive CCT303-406 according to the 3+3 dose escalation design.
This clinical study is to investigate the safety and tolerability of CCT303-406 CAR modified autologous T cells (CCT303-406) in subjects with relapsed or refractory stage IV metastatic HER2-positive solid tumors.