I was one of the thousands who followed Ivan's progress for two and a half years in his column on the BBC news website, and I remember being inspired and even uplifted by his refusal to bow out and surrender to the tumour which was slowly taking over.
There were high points and low points- times when it seemed he was going to beat it, and others when it became clear he wasn't; and I'll never forget the entry just after the birth of his son- but, though there was never even a hint of "look at me, I'm so brave," Ivan managed to keep his optimism going nearly all the time, and his sense of humour never deserted him.
It is precisely the openess and honesty with which he let us look in on his life that makes his story so compelling and so moving, and which made the news of his death so hard to take: even though I never met him, I felt I had lost a dear friend.