PD1+ TILS(Grupo SOLTI)

This is a prospective, multicenter, phase I/II, open-label, two-stage design of PD1+ TILs infusion in metastatic or advanced TNBC. TILS001 includes 3 parts. Previous to each phase inclusion, a specific ICF must be signed by the patient. Participants potentially eligible to participate in the clinical trial will be offered to sign a ICF three times prior to TILs treatment: 1) to allow for collection of archival FFPE tissue samples for determination PD1 by mRNA (Part #1), 2) prior to a fresh metastatic biopsy for selection, isolation and partial expansion of PD1+ TILs (Part #2) and 3) prior to allow for remaining study procedures and TILs therapy (Part #3, Main Consent).