Core Insights - GSK plc announced that the FDA has granted Orphan Drug Designation to its investigational drug GSK'227, now renamed risvutatug rezetecan, for treating small-cell lung cancer (SCLC) [1][7] - The Orphan Drug Designation was based on positive results from the phase I ARTEMIS-001 study, which demonstrated durable responses in patients with extensive-stage SCLC [2] Drug Development and Designations - A phase III study for risvutatug rezetecan in relapsed SCLC commenced in October 2025, with additional phase III studies evaluating the drug for osteosarcoma and early-stage studies for other cancers [3] - Risvutatug rezetecan has received multiple expedited designations, including Breakthrough Therapy Designation from the FDA and PRIME designation from the EMA for various cancer treatments [4] Market Context - Small-cell lung cancer accounts for approximately 13% of all lung cancers in the U.S. and has one of the poorest prognoses among major cancers, with most patients experiencing relapse after initial treatment [5] - GSK's shares have increased by 41.7% over the past year, outperforming the industry average rise of 11.6% [3]