In a statement released by her representative, the 18-time Grand Slam singles champion and member of the International Tennis Hall of Fame said her prognosis is good and she will start treatment this month."This double whammy is serious but still fixable, and I'm hoping for a favorable outcome," said Navratilova, 66.She said she noticed an enlarged lymph node in her neck while attending the season-ending WTA finals in Fort Worth, Texas, in November, and a biopsy showed early-stage throat cancer.Navratilova was diagnosed with a noninvasive form of breast cancer in 2010 and had a lumpectomy.The statement issued Monday said Navratilova would not be a regular part of Tennis Channel's coverage of the Australian Open later this month "but hopes to be able to join in from time to time" via video conference."