The Bee Gees star's family were keeping a bedside vigil, praying for the 62-year-old's survival.
He appeared to have made a recovery from liver and colon cancer this year, but doctors believe a second tumor may be present, reported The Sun.
He has also developed pneumonia.
His wife Dwina, brother Barry, 65, daughter Melissa, 37, and sons Spencer, 39, and Robin-John, 29, were at his bedside at a private hospital in London.
Robin revealed his battle with cancer in October 2010.
He had emergency surgery to treat a blocked bowel, before a further operation to treat a twisted bowel. Colon cancer was then discovered and it spread to his liver.
© Daily Mail, London |
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