Adaptimmune Spikes 127% Post-ASCO; Analyst Triples Price Target

Shares in UK-based biopharma Adaptimmune (ADAP) spiked 127% in Friday’s trading, after the company reported positive durability and efficacy data in synovial sarcoma at the American Society for Clinical Oncology (ASCO) Annual Meeting.

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The data demonstrated durability and responses in synovial sarcoma, supporting SPEARHEAD-1 as a potential registrational trial, ADAP announced. Dr David Hong spoke of a 50% response rate with inclusion of unconfirmed PR assessed after data cut-off. The ASCO presentation also described a new response in a patient with lung cancer, and a response in a patient with head and neck cancer.

At the same time, Adaptimmune also announced new responses in the SURPASS trial, confirming the potential for SPEAR T‑cell therapies targeting MAGE-A4 to treat a broad range of cancers in addition to sarcoma. In the SURPASS trial, three patients have responded out of the first four treated with ADP-A2M4CD8, ADAP said.

These data further support the rationale for two new Phase 2 trials – SPEARHEAD-2 in head and neck cancer, which will begin later this year, and a second trial in esophagogastric junction (EGJ) cancer planned for 1H 2021.

“We are raising our PT on shares of ADAP to $9 from $3 driven off data presented at ASCO which demonstrated broader platform value for the company’s T-cell receptor (TCR)-T-cell platform technology as well as increased probability of success (POS) for the indication of synovial sarcoma (SS)” cheered Mizuho Securities analyst Mara Goldstein following the presentation. She now assigns a probability of success for this indication of 90%, up from 70%.

According to Goldstein, responses accumulating in other tumor types, while not conclusive, point to broader potential in solid tumors. However she “does not yet see a critical mass in responses to more comfortably assign greater value to new indications.” As a result, the analyst reiterates her hold rating on the stock but tripled her price target to $9. Given ADAP’s recent rally this now translates into downside potential of 19%.

Meanwhile JonesTrading analyst Soumit Roy upgraded ADAP to buy from hold previously. He has a more bullish $15 price target on the stock, indicating further upside potential of 35%. Overall, ADAP continues to hold a Moderate Buy analyst consensus, with the Street evenly split between hold and buy. The average analyst price target currently stands at $10 (13% downside potential). (See ADAP stock analysis on TipRanks).