Ravi Parikh is a genitourinary medical oncologist at Winship Cancer Institute of Emory University. In the days since former president Joe Biden’s cancer diagnosis, amid the typical outpouring of support for a public figure diagnosed with cancer, two leading conspiracy theories have emerged.

Joe Biden puts his hand on his heart as the national anthem plays during a farewell ceremony at Joint Base Andrews on Jan. 20, 2025. Reporter Political leaders from across parties in the U.S ...

Donald Trump misspoke in off-the-cuff remarks on May 19, saying he felt 'sad' to learn that Joe Biden has 'stage 9' prostate cancer. His comments came one day after Biden revealed he has stage 4 prostate cancer,

Peter A. McCullough, a former cardiologist who promoted unproven treatments like ivermectin and hydroxychloroquine at the height of the pandemic, posted a video to Instagram claiming that Biden’s cancer was “turbo cancer.”

When a former president receives a serious medical diagnosis, the traditional response has been to set aside political ... Joe Biden disclosed that he has an aggressive form of prostate cancer.

Biden’s cancer was graded as a 9 on the Gleason scale—among the most aggressive forms. Despite the diagnosis, messages of support have poured in from across the political spectrum.