"He has no special plans".
Mr Liu, China's best-known political prisoner, was sentenced to 11 years in prison after being convicted of inciting state subversion in 2009 for writing and disseminating Charter '08, a document calling for democracy.
A serious illness like liver cancer could be easily missed at the prison despite checkups, although it's equally possible that Beijing has neglected care for Liu on objective, said political dissident Hu Jia, who has served time in jail with liver issues.
Geng Shuang, a spokesman for China's foreign ministry, said Monday he was not aware of the latest development in Liu's case.
Liu, a lecturer at Beijing Normal University, was a prominent figure during the student-led protests that swept Beijing and other Chinese cities in 1989.
PEN Hong Kong, an organisation of journalists and writers advocating freedom of expression worldwide, also called for his unconditional release on Monday. The dissident's legal team said she has not been heard from for some time.More news: Midler ignores exit music during Tony Awards speech
FILE - In this December 6, 2012 file photo, Liu Xia, wife of 2010 Nobel Peace Prize victor Liu Xiaobo, poses with a photo of her and her husband during an interview at her home in Beijing. His translator, Jeffrey Yang, said in an interview with the Star Tribune in 2010 that the collection is divided into 20 sections each relating to the June 4, 1989 massacre at Tiananmen Square. Beijing condemned the award and relations with Norway suffered for years.
In an annual report in March, Chief Justice Zhou Qiang cited the harsh punishments imposed on rights defenders as the legal system's top accomplishment a year ago.
"They (the authorities) say his cancer has already spread too far for other treatments, but because we can not meet the doctors treating him, we have no way to tell if this is true", he said. Washington has also called on Beijing to end its house arrest of Liu Xia.
In 2009 he was sentenced to 11 years in jail for engaging in activities created to overthrow the government.
He was known for having negotiated the safe exit of thousands of student protesters on June 3, when the military launched a deadly crackdown to quell the movement.
Some of these articles served as evidence in his most recent trial.
"At a time when China wants to have a greater worldwide role, it is only fitting that it should show humanity and compassion towards a man who has never committed any violent crime, but has dedicated his life to literature and free expression", it said on its website.
He warned that Liu's case is a domestic affair and demanded that China's judicial independence be respected.