Stamos vowed to be "be by your side through it all." John Stamos is showing some brotherly love to his Full House costar Dave Coulier. After Coulier revealed today that he's been diagnosed with a "very aggressive" form of cancer,

"Full House" stars and friends John Stamos and Dave Coulier 's bond is as strong as ever. This was made apparent after Coulier revealed on Wednesday he had been diagnosed with stage 3 non-Hodgkin lymphoma, reports People.

John Stamos was a heartthrob in the 1980s when he played Blackie Parrish on General Hospital. Because of the accidental death of Lou Swenson (Danielle von Zerneck), Blackie was convicted of manslaughter and sent up the river for two years.