Justice Ruth Bader Ginsburg announced Friday that she is undergoing chemotherapy to treat a recurrence of cancer.<br />According to Justice Ginsburg, the treatment is yielding "positive results."<br />The 87-year-old said she remains "fully able" to continue her post on the Supreme Court of the United States.<br />Friday's announcement indicates that the pancreatic cancer Ginsburg was treated for in 2009 has returned.<br />Ginsburg had radiation therapy for pancreatic cancer in 2019 and had lung tumors removed in 2018.