A Chinese hospital treating the Nobel Peace Prize laureate Liu Xiaobo has invited cancer experts from the United States, Germany and other nations to join his team of doctors, judicial officials said in a brief statement Wednesday.

Mr. Liu, 61, was found to have advanced liver cancer in May and granted parole to move from prison to a hospital in Shenyang in late June. He had been sentenced to 11 years in prison in 2009 for “inciting subversion of state power” by helping organize the Charter 08 manifesto, which called for democratic reforms in China.

He was in prison in 2010 when the Norwegian Nobel Committee awarded him the peace prize for “his long and nonviolent struggle for fundamental human rights in China.” He became the third person to win the prize while under government detention. His absence at the ceremony in Oslo was marked with an empty chair.