Doctors initially told the 89-year-old retired televangelist he had three months to live after it was determined the cancer had spread from his esophagus to his lymph nodes, daughter Sheila Schuller Coleman said.
A followup exam revealed he was "a good candidate for chemotherapy and radiation treatment that could extend his life," an update on the Hope Center of Christ's website said.
Son Robert A. Schuller said he spent Wednesday with his father and said he's trying not to focus on "negative" things, the Los Angeles Times reported.
"As you know, he's so easy-going. He has lived an amazing life," the younger Schuller said.
Robert H. Schuller started his church at a drive-in movie theater in 1955, eventually becoming the ministry's face and voice of its "Hour of Power" television program, and building the massive, glass-paned cathedral in 1980.