• 1\) Immunohistochemically documented NY-ESO-1 expression, defined as ≥ 1+ expression on either archival or fresh tumor tissue by immunohistochemistry, in ≥50% of the sampled tumor tissue.

• Patients with sarcoma, who have received at least one line of standard therapy (if available) and failed to respond, progressed or were intolerant to that therapy, will be eligible. If the participant refuses or is, in the opinion of the investigator, ineligible for these treatments, the reason must be documented in the medical record.

• Patients with metastatic melanoma:

∙ Without proto-oncogene B-Raf (BRAF) mutation who have received at least one line of standard therapy and failed to respond, progressed or were intolerant to that therapy, will be eligible. If the participant refuses or is, in the opinion of the investigator, ineligible for these treatments, the reason must be documented in the medical record.

‣ With BRAF mutation who have received at least two lines of standard therapy and failed to respond, progressed or were intolerant to that therapy, will be eligible. If the participant refuses or is, in the opinion of the investigator, ineligible for these treatments, the reason must be documented in the medical record.

• Patient must be HLA-A\*0201 and/or HLA-A\*0205 positive, as identified by high-resolution genomic deoxyribonucleic acid (DNA) typing of the HLA-A locus.

• Age ≥ 18 years

• Able to undergo apheresis

• At least one lesion accessible to biopsy for translational research (TR) at D30, without putting the patient at unusual risk.

• Eastern Cooperative Oncology Group (ECOG) performance status of 0 to 1.

• Life expectancy of greater than 12 weeks.

• Radiologically measurable disease (as per RECIST v1.1).

⁃ Adequate organ function