An under-the-radar biotech firm called Tempest Therapeutics Inc. is set to notch its best week on record after results from a liver cancer trial sent the stock surging 3,973% — and tumbling the next day.

Wall Street cheered as the stock shot up to $9.77 on Wednesday when the drug developer said its experimental cancer therapy in a cocktail with two Roche Holding AG drugs worked better than the pair of drugs by themselves. The surge after the Roche-run study helped push Tempest’s market value to $130 million from a mere $3 million as of the previous day’s close.

Shares of Tempest have come off that high in the two latest trading sessions as investor enthusiasm moderated and a broader market selloff in risky assets batters the high-risk biotechnology sector. The firm’s current market value of $54 million remains more than 16-fold of what it was, before the jump.

Tempest was “coming from an almost unfathomably low valuation going into this data readout,” as investors were skeptical following earlier study results, according to William Blair analyst Matt Phipps. “The company is still clearly undervalued for the blockbuster opportunity” of its cancer drug, he wrote in a note dated Wednesday.

Analysts tracked by Bloomberg that cover the company are universally bullish, with all four rating Tempest the equivalent of a buy. The average of three price targets suggests the stock could more than quadruple from its current $4 a share level.

HC Wainwright & Co. analyst Joseph Pantginis expects Tempest to ride the wave to a market capitalization of about $770 million. Yet, Pantginis said his valuation estimate is only based on a 25% projected chance of success for the trial, which he calls “conservative.” He boosted his price target to $47 this week, the highest among three analyst targets.

“Significant upside potential remains,” he wrote, citing the market for liver cancer drugs and the possibility of Tempest’s drug being part of the first-line of treatment for patients.