Bucket list teenager Stephen Sutton's fund-raising campaign has reached £3 million after being backed by a host of celebrities, including Sherlock actor Benedict Cumberbatch and Coldplay.
The 19-year-old is raising money for the Teenage Cancer Trust, which has helped him throughout his battle with colorectal cancer.
The campaign has been supported most actively by the comedian Jason Manford, who said he hopes it will reach £5 million.
The current amount has already broken all records on the JustGiving charity site.
Via his Facebook page Stephen's Story, the teenager has been keeping people updated with his condition - and after posting what he thought was a 'final thumbs up' last week his condition seems to have dramatically improved.
He wrote on Sunday afternoon: "This whole week has been pretty unbelievable and I can barely fully get my head round everything that has gone on."
He described how his coughing and shortness of breath became 'incredibly severe', until his coughing brought up a 'solid object'.
He wrote: "This morning I am relying on NO external oxygen to breath at all and I'm feeling bloody fantastic.
"The doctors have discussed what's happened and the only plausible conclusion is that I've literally coughed up a tumour."
Stephen has consistently repeated that his condition is terminal, and said that it is still a case of counting the days - adding that 'at the moment the days just keep on coming!'
Cumberbatch, fellow actor Simon Pegg and Coldplay have sent messages of encouragement via Twitter, urging people to donate to Stephen's cause, and now Simon Cowell has pledged to make a 'significant' contribution himself.
Stephen, from Burntwood, Staffordshire, said the reaction to his cause had confirmed his belief that people are 'good'.
He wrote: "I always describe my cancer as a huge kick up the backside that taught me a lot of good: the importance of helping others, of making every second count, of making sure life is for LIVING."