I'm just guessing here and I'd love to have those on this thread with more medical knowledge comment on this ... but I think Ford is probably battling some sort of complication, perhaps an opportunistic infection like pneumonia that's taken advantage of his weakened state and his compromised immune system due to all the chemo. He might even be in some sort of septic shock. It's my guess that his medical team is frantically trying to save him from this acute illness so he can recover and perhaps undergo another round of chemo but his condition is grave and probably getting worse by the hour, which is why his family's been summoned. Many cancer patients die not from cancer but from complications such as infections. In fact, pneumonia is sometimes referred to as "the cancer patient's friend" because it ends their suffering with a relatively painless and quick death.