"Full House" alum Dave Coulier announced on the newest ... part of the immune system that helps protect the body from infection and disease, according to the National Cancer Institute.

The “Full House” star revealed his “roller coaster ... and needles for a few days” while waiting to hear whether the disease had spread “to any major organs or [his] blood or bones ...

while noting his family's history with the disease. "RIP Shannen Doherty," he wrote on Instagram. "I met her during the Full House days. She was lovely and had a beautiful smile. Today ...