Conclusion: The recent surge in XLO's stock price is primarily due to the promising licensing agreement with Gilead Sciences. However, given the high volatility and the relatively lower gain compared to other stocks mentioned in the news, it is crucial to conduct a comprehensive analysis of XLO's long-term prospects, competitive position, and Gilead's involvement in the development process. Investors should consider this information alongside their risk tolerance and investment horizon before making a decision to buy XLO shares.