John Cena’s Brother Sean Cena Had Brain Cancer? John Cena's Dad, John Cena Sr. speaks about his son

John Cena’s Brother Sean Cena Had Brain Cancer? John Cena's Dad, John Cena Sr. speaks about his son Sean Cena is the Brother of WWE Pro Wrestler John Cena Sean Cena Is The Survivor Of Brain Cancer In November 2011, Sean was diagnosed with brain cancer. The doctor had identified an inoperable tumor in his brain which Cena battled with all determination and strength. The tumor was detected earlier which is why he could survive it. “Sean’s doing extremely well, “It was an inoperable brain tumor, but one of the main reasons he’s done well is the early detection.