Speaking to Reuters, he said the British drugmaker's top-selling cancer therapy Tagrisso as well as its potential blockbuster Enhertu would likely be negatively affected by the new law in the coming years.

Last week, a landmark law that included provisions to tackle the rising cost of medicines was passed in the United States, in a rare legislative defeat for the powerful pharmaceutical industry that set a precedent for curbing drug prices in the world's most lucrative market for medicines.

(Reporting by Aimee Donnellan and Natalie Grover; Editing by Mark Potter)