June 4, 2018

Adaptimmune Announces First Patient to Receive One Billion Target Cell Dose after Positive Safety Data from Pilot Study with MAGE-A4 SPEAR T-cells

PHILADELPHIA, Pa. and OXFORD, U.K. — Adaptimmune Therapeutics plc (Nasdaq:ADAP), a leader in T-cell therapy to treat cancer, today announced that the independent safety review committee has recommended dose escalation in the MAGE-A4 basket study, based on an acceptable safety profile in three patients dosed with 100 million cells. The company will start treating patients with the target dose of one billion transduced MAGE-A4 SPEAR T-cells in the ongoing basket study.

In addition, after confirming expression levels for MAGE-A4 from synovial sarcoma and myxoid/round cell liposarcoma (MRCLS) tumor samples, Adaptimmune has amended the study to add these two indications to the ongoing basket study, which already includes bladder, melanoma, head & neck, esophageal, gastric, ovarian, and non-small cell lung (NSCLC) cancers. Screening of patients with synovial sarcoma and MRCLS is ongoing.

“Today’s announcement that we are dosing patients with one billion cells, which we believe is a potentially therapeutic dose based on data from NY-ESO, means that we are on target to get response data in our MAGE-A4 study, to which we have added two solid tumor indications, in 2018,” said James Noble, Adaptimmune’s Chief Executive Officer. “This follows the earlier announcement that pilot studies in our other program, MAGE-A10, have also moved to the one billion cells dose.”

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