Eddie Montgomery of Montgomery Gentry has been successfully treated for prostate cancer, according to his doctor. "Mr. Montgomery underwent successful robotic surgery for prostate cancer in December," Dr. Thomas Kirk Slabaugh Jr. said. "His cancer was completely excised, and he will not require further treatment for his prostate cancer in the future. Mr. Montgomery has benefited greatly from early detection of prostate cancer with PSA screening." Montgomery Gentry will make their first public appearance this year at the Grand Ole Opry on Friday (Jan. 21) and will depart for an eight-day USO Tour to Seoul, South Korea, and Okinawa, Japan, on Sunday (Jan. 23).