RecruitingBiological interventionACTengine® IMA203/IMA203CD8 as Monotherapy or in Combination With Nivolumab in Recurrent and/or Refractory Solid TumorsThe study's purpose is to establish the safety and tolerability of IMA203/IMA203CD8 products with or without combination with nivolumab in patients with solid tumors that express preferentially expressed antigen in melanoma (PRAME).