The search for a marrow donor for a prize-winning pianist became acute yesterday after she slipped into a critical condition with pneumonia. Janice Tang Wai-yi, a music graduate of the University of Hong Kong, was transferred this week to the intensive care unit of Queen Elizabeth Hospital with severe pneumonia, said Dr Chan Cheuk-hung, a consultant physician at the hospital. 'Eighty per cent of her bone marrow contains cancer cells. A bone marrow transplant is the only reliable cure and last resort.' He said if Ms Tang did not receive a bone marrow transplant, her chances were 'dismal'. Dr Chan was speaking ahead of a donor campaign by the Marrow Match Foundation for Ms Tang on Saturday at the Plaza Hollywood in Diamond Hill from 2pm to 8pm. This will be followed by a campaign at Queen Elizabeth Hospital on September 22 and at the University of Hong Kong on September 25-26. The appeal was backed by a Cathay Pacific reservations officer,who also needs a transplant. Mable Tam, who celebrated her 27th birthday in hospital yesterday, said: 'The more people come, the greater the chance we can get the correct marrow.' Doctors said Ms Tang had an 'odd tissue type' that made it difficult to find a compatible donor from the 38,000 Hong Kong donor registry and tens of thousands overseas. University of Hong Kong Professor Raymond Liang Hin-suen, honorary secretary of the foundation, said it hoped to recruit 2,000 blood donors during the campaign to increase the chance of finding a suitable match for Ms Tang. Dr Brian Hawkins, vice-president of the foundation, said new donors found unsuitable for Ms Tang would be entered into the Hong Kong registry and could be used in the future to help other patients in need. The foundation is keen to recruit healthy Chinese aged 18 to 55 to become donors. Its hotline is 2855 9855.