Smoking increases the risk of breast cancer

According to a study published in Archives of Internal Medicine, US scientists have found that smoking before menopause, especially before birth, may increase the risk of breast cancer. .

Dr. Fei Xue and colleagues at Harvard Medical University in Boston used data collected from a nurse health study (NHS) to review medical records of 111,140 women in the period. from 1976-2006 for active smoking and 36,017 women from 1982-2006 about passive smoking.

Smoking will increase the risk of breast cancer in women.Illustration.

The results showed that a total of 8,772 cases of breast cancer were confirmed during the study period. The rate of breast cancer has been linked to more smoking in the past and now, smoking in the long term and smoking since young .

Scientists have concluded that smoking before menopause increases the risk of breast cancer , while there is evidence that smoking after menopause can reduce this risk. . " This shows the anti-estrogenic effect of post-menopausal smoking that may help reduce already low levels of endogenous estrogen ."

Previously, Canadian scientists also pointed out that it was enough to inhale breast cancer regularly, especially in premenopausal women. The danger level is equivalent to active smoking.

Dr. Kenneth C. Johnson of the Canadian Community Health Agency investigated the relationship between breast cancer risk and smoking (both passive and active) by analyzing 19 previously published studies. .

The results showed that regular passive smoking for a long time increased the average risk of breast cancer by 27% in women who never smoked. In some studies, this risk is up to 80-90%.

In 14 studies, " the relationship between smoking and the risk of pre-menopausal cancer is significant, increasing by 68% in people who are exposed to permanent and long-term smoke, despite their lifetime. never touched a cigarette ". This risk is up to 119% in the remaining 5 reports.

Breast cancer is the most common and leading cause of cancer in women in many industrialized countries. Most tumors occur in women aged 35-45, which rarely occur under the age of 30.

In Vietnam, breast cancer is the most common female disease in all types of cancer and up to 50% of patients are detected in the late stages. When the breast shape changes, the tumor appears . you need to go to the hospital immediately for examination.