Several biotech names posted strong gains in Monday's after-hours session, driven by clinical updates, strategic shifts, and upcoming catalysts. Volume spikes and late-day news helped push prices higher, setting the stage for potential follow-through in regular trading.Shares of Cassava Sciences (SAVA) surged in after-hours trading on Monday, climbing 37.1% to $3.18 following a regular session close of$2.32, which itself marked a 1.75% gain. The sharp move came on unusually high volume, with more than 11 ...