As reported by Green Man Review, Kage Baker's condition has deteriorated quite badly:
Kage's doctor has informed us she has reached the end of useful treatment. The cancer has slowed, but not stopped. It has continued to spread at an unnatural speed through her brain, her lungs and - now - reappeared in her abdomen. It is probably a matter of a few weeks, at most.
Kage has fought very hard, but this is just too aggressive and mean. She's very, very tired now, and ready for her Long Sleep. She's not afraid.
This is just terrible, sad news to hear. One of my favourite authors of the last decade or so, and whose work I will treasure long after she is gone.
If you want to drop her a line or send her something (you really should), the information on how to do so can be found here.