Dr Cheung graduated from University of Hong Kong in 1977 and received her surgical training at the Department of Surgery, University of Hong Kong. After qualifying as Surgeon from the Royal College of Physicians and Surgeons of Glasgow, she received further specialized training in Breast & Endocrine Surgery at the University of Michigan from 1985 to 1986.

She served as lecturer in the Department of Surgery at Queen Mary Hospital from 1980 to 1990 and became Consultant Surgeon at Kwong Wah Hospital in 1990. She was awarded Fellow of the Royal Australasian College of Surgeons and the American College of Surgeons in 1990.

During her years of service as academic surgeon at Queen Mary Hospital and consultant surgeon at Kwong Wah Hospital, she started a one-stop breast clinic, incorporating the use of needle biopsy procedures and breast ultrasound into patient consultation. In late eighties, she initiated breast conserving surgery for early breast cancer patients and breast reconstruction for patients after mastectomy in Hong Kong. In 1990, she set up the first breast-screening program in Hong Kong at Kwong Wah Hospital using low dose mammography, which remains the longest running breast screening centre with auditing.

After entering into private practice, she became Honorary Consultant Surgeon at the Hong Kong Sanatorium & Hospital. In 1999, Dr Cheung set up the first Breast Care Centre in private hospital, bringing in the new technology of stereotactic breast biopsy into Hong Kong. She started the first organized breast screening program in private with quality assurance and auditing. She also started breast care nurse training and incorporated nursing support and cancer counseling to service to breast cancer patients.

In 2001, with the help of international renowned surgeons, Dr Cheung started the first sentinel node biopsy program at Hong Kong Sanatorium & Hospital, providing improved care for patients with early breast cancer.

In 2003, with the support of medical and clinical oncologists, surgeons, radiologists and pathologists, Dr Cheung set up a Multidisciplinary Breast Cancer Team, the first of its kind in Hong Kong, which holds weekly multidisciplinary breast conference at the Hong Kong Sanatorium & Hospital, aiming to provide multimodality treatment plans for breast cancer patients under their care.

She received the award of Outstanding Professional Women in 1999 from the Hong Kong Women Professionals and Entrepreneurs Association for her dedication and contribution in her career. She was further elected as one of the ten Most Successful Women 2003 by local Jessica Magazine.

She founded the Hong Kong Breast Cancer Foundation in 2004, a charitable organization made up of patients, health care professionals and their supporters, who share the same mission towards bettering breast health and cancer care in Hong Kong.

In 2007, she established the Hong Kong Breast Cancer Registry – the first-of-its-kind comprehensive cancer specific registry capturing information on local breast cancer in Hong Kong, to provide evidence for research and analysis into improving breast cancer prevention and care.

Apart from her private practice at the Breast and Endocrine Surgery Centre in Central, she is also Honorary Clinical Associate Professor of Surgery at the University of Hong Kong, Honorary Director of the Breast Care Centre of the Hong Kong Sanatorium & Hospital, trainer for Surgical Program for young doctors for the College of Surgeons of Hong Kong.

She is involved in lecturing to local doctor groups and the public, teaching medical students locally, and is also active in international academic exchange and currently serves as council member of the Breast Surgery International, international group of breast surgeons. Her current academic interest is in breast cancer screening and early detection, oncoplastic breast cancer surgery and sentinel node biopsy for early breast cancer.

In community service, Dr Cheung has been a zontian since early nineties and is past president of Zonta Club of Hong Kong. In appointed public service, she has served as member of the Social Security Appeal Board, Supplementary Medical Professionals Council, chairman of Optometrists Board and is currently serving as member of the Consumer Council, Women’s Commission and Council on Human Reproductive Technology.