Accountant Alan Tsang Kai-chi said he felt as if he had won the lottery when he found his older sister was a perfect bone-marrow match. Mr Tsang, 30, received a life-saving transplant after a relapse of Hodgkin's lymphoma, a cancer of the lymphatic system, 18 months ago. He said he was first diagnosed with the lymphoma when he was a 21-year-old accountancy student. Eight sessions of chemotherapy over eight months at Queen Elizabeth Hospital was able to produce a remission and allowed him to earn his degree. By 1999, Mr Tsang was a deputy finance manager of a listed company with a steady girlfriend and was studying for a master's degree. Then the disease came back with a vengeance. 'It was a very big shock to me,' he said. 'When the doctor told me, my mind was empty. After the clinic session I went around Jordan and walked towards Tsim Sha Tsui. The street was very noisy but inside me it was quiet. I could not hear any voices.' Doctors at Queen Elizabeth Hospital first gave him a transplant harvested from his own marrow, which halted the progress of the disease for eight months. But the final solution turned out to be a sibling transplant. A test on his sister, Carrie Tsang Wai-han, proved she was a perfect match. Mr Tsang, who will marry later this year, has written two booklets for other patients facing life-threatening illnesses. 'In accounting terms, this illness has been profitable to me,' he said. 'My expense is my physical pain but my revenue is my life reflection and my love for all around me. My direction in life has become clearer and my relationship with my family stronger.'