FFPE TMB Reference Standards: Reference standards are made from human lung cancer cell lines at 30% tumor content, formalin-treated and paraffin-embedded into FFPE blocks, which are then cut into 10 µm sections. 30% tumor-normal FFPE reference standards, compatible with a range of FFPE extraction kits, range of TMB scores. Manufactured in GMP-compliant and ISO 13485 certified facilities.