BEVERLY HILLS -- "The Big C," Showtime's (and Laurra Linney's) series about a woman battling cancer, was handed an end-of-series notice Monday. The series will wrap in four hour-long episodes next season (no airdates were provided). The news comes as a bit of a surprise -- Linney is a wonderful actress, of course, and has a Golden Globe (and Emmy noms) for this one alone to prove it. But the series never exactly entered the pantheon of Showtime hits, and Linney's character Cathy was handed very very bad news when this series launched. Asked how it would end, Showtime chief David Nevins told TV writers here not to assume anything (notably a fatal conclusion, so to speak). He said the series had cooked up a "novel" end to Cathy's predicament.