U.S. Supreme Court Justice Ruth Bader Ginsburg, who underwent surgery in December for lung cancer, on Friday completed radiation therapy for a malignant tumor on her pancreas, the court said.

The three-week course of stereotactic ablative radiation therapy began Aug. 5 at Memorial Sloan Kettering Cancer Center in New York City, according to the Supreme Court. The treatment was administered on an outpatient basis.

The tumor was first detected after a routine blood test in early July, and a biopsy performed July 31 at Sloan Kettering confirmed it, the Supreme Court statement said. A bile duct stent was placed as part of her treatment.

"The justice tolerated treatment well," the court's statement said. "She cancelled her annual summer visit to Santa Fe, but has otherwise maintained an active schedule. The tumor was treated definitively and there is no evidence of disease elsewhere in the body. Justice Ginsburg will continue to have periodic blood tests and scans. No further treatment is needed at this time."

Ginsburg, 86, underwent surgery in New York on Dec. 21 for the lung cancer. In February 2009, the justice had surgery for early stage pancreatic cancer, and in 1999, Ginsburg recovered from what she described as a "long bout" with colorectal cancer.

Ginsburg is still expected to visit University of Buffalo School of Law on Monday, a spokesperson for the university said. SUNY Chancellor Kristina Johnson is expected to present Ginsburg with an honorary doctoral degree in law.

"Justice Ginsburg's strong voice supporting gender equality, an independent judiciary, separation of church and state, and human rights deeply resonates with our mission as a law school," Aviva Abramovsky, dean of the UB School of Law, said in a statement in May.