Core Insights - The S&P 500 index has declined approximately 3.5% from the start of November through November 21, following a 2.3% increase in October [1] - Regeneron Pharmaceuticals has seen its stock rise despite the overall market downturn, driven by the FDA approval of its Eylea HD injection for treating macular edema following retinal vein occlusion (RVO) [1][3] Company Developments - On November 19, Regeneron received FDA approval for Eylea HD 8 mg, making it the first and only FDA-approved treatment for RVO with dosing up to every eight weeks after an initial monthly period [3][5] - Eylea is already the leading treatment for several conditions, including wet age-related macular degeneration and diabetic retinopathy, and this approval expands its application [5] Market Position - Regeneron is currently valued at 18 times trailing earnings, which is considered reasonable for investors looking for growth opportunities in the biotech sector [6] - Despite the recent rise in Regeneron's stock price, it remains a valid investment option for biotech investors [7]