“We are seeing younger women with breast cancer throughout the whole region. It’s the same in China, Taiwan, Hong Kong, (South) Korea and Singapore,” said Louis Chow, executive director of the Hong Kong-based Organization for Oncology and Translational Research (OOTR).
“Compared to (victims in the) U.S. and Europe, we’re seeing re-menopausal women in Asia, whereas in developed countries we are seeing post-menopausal women, in their mid-50s. In Asia, we see those in their 40s and we are not even surprised to see those in their 30s,” he said in an interview.
Breast cancer is the most common cause of cancer in women. In the United States, it affects one in eight women and is the second most common cause of cancer deaths in women after lung cancer. Eight percent of breast cancer cases occur in women over 50 in the United States. Breast cancer is rare for men. While the median age of women stricken with the disease in Hong Kong is 52, it is increasingly seen in younger women.
Between 1993-1997, 88 cancer cases were seen in the 40-49 age group per every 100,000 of the population, up nearly 63 percent compared to 54 cases in the years 1978-1982. But cancer cased in the 50-59 age group grew more slowly. Between 1993-1997, there were 98.5 cases per every 100,000 of the population, up just 31 percent compared to 75 cases in 1978-82.
Cases in the 30-39 age group grew 43 percent over the same period. But while breast cancer has been extensively studied in the West, experts have little idea as to the risk factors in Asia.
“In the West, the risk factors are a very strong family history, uterine and ovarian cancers. These may also apply here, but we can’t just use them,” said surgeon Chow. “We can’t borrow the model from the West and put it here. We have a different genetic makeup. We have different clinical presentations especially in terms of age, we can’t just borrow.”