The study which was conducted recently has silenced the findings of previous studies which indicated that wearing a bra may be a reason some women get breast cancer.
The debate has been ongoing for 20 years with some studies finding that before bras became relevant and known there were no reported cases of breast cancer in mankind.
Some of the famous bra and breast cancer theories were that wearing a bra especially underwire ones block the drainage of waste products through the lymphatic glands inhibit the disposal of toxins, leading to more exposure to carcinogenic chemicals.
Another study of 3,000 women found among bra users, larger cup size was associated with an increased risk of breast cancer among post-menopausal women, but was partly accounted for by obesity.
These two mentioned studies and others prompted a team of researchers in Washington DC to conduct their own study, with a team of 1,513 aged between 55 and 75.
More than 1,000 had been diagnosed with either invasive ductal carcinoma (IDC) or invasive lobular carcinoma (ICL), while the rest were healthy and acted as a control.
Face to face interviews gathered answers to questions regarding bra cup and band sizes, the age at which participants started regularly wearing a bra, type of bras they wore (wired or not) and the number of hours per day, and the days per week they wore a bra at different times of their lives.
No evidence of a link between breast cancer risk and bra size, type, or frequency of wearing, was found, researchers said.
The researchers wrote: ‘The findings provide reassurance to women that wearing a bra does not appear to increase the risk for the most common histological types of post-menopausal breast cancer.’
The research was published in the journal of Cancer, Epidemiology, Biomarkers and Prevention.