Core Insights - Merck's strong position in the oncology market is primarily driven by Keytruda, which contributes over half of the company's pharmaceutical revenues [1] - Keytruda generated sales of $23.30 billion in the first nine months of 2025, with $8.14 billion in the third quarter, reflecting an 8% year-over-year increase, although it missed expectations [2] - The FDA approved a subcutaneous formulation of Keytruda, known as Keytruda Qlex, which extends patent protection beyond 2028, aiding long-term growth [5][7] Sales Performance - Keytruda's sales in the third quarter of 2025 were weaker than expected, missing the Zacks Consensus Estimate of $8.40 billion [2] - Despite the patent loss expected in 2028, Keytruda's sales are projected to remain strong until then, with anticipated growth from new indications and earlier lines of therapy [8] Future Growth Strategies - Merck is exploring various strategies for long-term growth, including innovative immuno-oncology combinations and partnerships, such as the development of a personalized mRNA therapeutic cancer vaccine with Moderna [4][6] - Keytruda is expected to gain traction in early lung cancer and other indications as FDA decisions approach [3] Competitive Landscape - Competitive pressure may increase from dual PD-1/VEGF inhibitors like Summit Therapeutics' ivonescimab, which has shown potential to replace Keytruda as the standard of care in certain settings [7] Financial Performance - Year-to-date, Merck's shares have declined by 13.2%, underperforming the industry and the S&P 500 [9] - Merck's valuation appears attractive, with a price/earnings ratio of 9.28 compared to the industry average of 15.57 [10] - The Zacks Consensus Estimate for 2025 earnings per share has slightly increased, while the estimate for 2026 has decreased [11]