SLS Stock Rallies After Hours As CEO Teases Leukemia Study Data Any Day Now

• As of May 11, 2026, 78 deaths had occurred in the study, called REGAL.
• On Tuesday, Sellas CEO said that the company expects the 80th event imminently.
• The CEO also expressed optimism for the upcoming data, highlighting that the survival time in the trial appears “longer than expected.”

Shares of SELLAS Life Sciences Group (SLS) jumped nearly 8% in after-hours trading on Tuesday after the company CEO said that they expect data readout for its trial of galinpepimut-S (GPS) in acute myeloid leukemia (AML) ‘very soon.’

Last week, the company said that the trial is now just two events away from triggering a topline data readout. As of May 11, 2026, 78 deaths had occurred in the study, called REGAL, the company said. The prespecified 80th event will trigger analysis and disclosure of results, the company said.

On Tuesday, Sellas CEO Angelos Stergiou said that the company expects the 80th event imminently. SELLAS currently remains blinded to the data as the study is being conducted by a contract research organization. However, the CEO voiced optimism for the upcoming data.

“Survival times in REGAL indeed appear longer than expected,” he said at the Stifel 2026 Targeted Oncology Virtual Forum.  “From a mathematical standpoint, current treatment landscape and published data and real-world evidence…every passing month may increase the probability of a successful study due to a potential GPS effect.”  

The CEO assured that the company will inform the public once the 80th event materializes in the trial he termed the firm’s “most advanced” and a “very important near-term catalyst for SELLAS.” He also added that the firm had initially assumed only 12-15 months before the 80th event was met in the trial. “Obviously, that has surpassed the timing,” the CEO said.

The company said it would take “a few weeks” after the 80th event to provide a top-line data disclosure.

How Did SLS Retail Traders React?

On Stocktwits, retail sentiment around SLS stayed within the ‘extremely bullish’ territory over the past 24 hours, while message volume fell from ‘extremely high’ to ‘high’ levels.

A Stocktwits user expressed optimism for a major rally at the time the company hit the 80th event milestone.

Another user termed the current jump a calm before the storm.

SLS stock has gained 334% over the past 12 months. 

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