Adaptimmune has seen partial responses in three of the first four myxoid/round cell liposarcoma (MRCLS) patients treated with its T cells. The early data raised hopes the GlaxoSmithKline-partnered drug will be effective in multiple types of solid tumor, sending Adaptimmune shares up nearly 20%.
Abingdon, U.K.-based Adaptimmune first posted clinical data linking NY-ESO SPEAR T cells to responses in synovial sarcoma patients in 2015. Those results gave Adaptimmune preliminary validation that it can engineer T cells to take out solid tumors but left the biotech needing more evidence to show its platform is effective against a range of cancers.
The MRCLS data mark a small step toward that goal. MRCLS, like synovial sarcoma, is a soft-tissue sarcoma but the underlying genetics and clinical manifestations of the two diseases are different.