Greenwich LifeScience skyrockets more than fourfold after upbeat data on breast cancer treatment

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Shares of Greenwich LifeSciences Inc.
GLSI,
+500.53%

were launched to a more than fourfold gain in very active midday trading Wednesday, after the Texas-based biopharmaceutical company displayed upbeat results of a Phase IIb trial for its breast cancer treatment. The stock’s 345.3% gain, prior to a trading halt for volatility, made it the biggest gainer trading on major U.S. exchanges, while trading volume of 8.5 million shares was many multiples of the full-day average of about 22,000 shares. The company said before the open that a poster presentation of five-year data for the GP2 clinical trial met all of its endpoints and showed zero recurrence of breast cancer in patients who had previously undergone surgery. The stock, which went public on Sept. 25, was now trading 302.6% above its $5.75 initial public offering price. The stock was soaring on a day that the iShares Nasdaq Biotechnology ETF
IBB,
-1.46%

slipped 0.5% and the S&P 500
SPX,
-0.63%

eased 0.2%.



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