Pope Leo, who was only elected in May 2025, has been diagnosed with lung adenocarcinoma, the most common form of lung cancer. First US pope promises slow return to full activity Unclear when pope will hold next public event Leo scheduled for South America trip in November VATICAN CITY — Pope Leo pledged on Sunday to slowly resume his usual activities as the leader of the world’s 1.4 billion Catholics as he greeted crowds in St. Key points and original sources are listed below.

• Pope Leo, who was only elected in May 2025, has been diagnosed with lung adenocarcinoma, the most common form of lung cancer.S1

• First US pope promises slow return to full activity Unclear when pope will hold next public event Leo scheduled for South America trip in November VATICAN CITY — Pope Leo pledged on Sunday to slowly resume his usual activities as the leader of the world’s 1.4...S2