For instance, those with estrogen receptor-negative invasive cancer developed 7.26 pounds more than those who were cancer free.

The authors conclude: “Longer leisure-time spent sitting was associated with a higher risk of total cancer risk in women, and specifically with multiple myeloma, breast and ovarian cancers, but sitting time was not associated with cancer risk in men.

This might sound like very bad news for women who are tied to their chairs at the office all day long, but new research has proved that there might be a link between breast cancer and prolonged sitting.

Women who spend too much time sitting are putting themselves at risk of cancers.

For the study, the researchers reviewed a baseline questionnaire and a follow-up one completed four years later by 303 breast cancer survivors and 307 cancer-free women enrolled in an ongoing and long-term study at the Kimmel Cancer Center of women with a family history of breast or ovarian cancer. Then the researchers followed the 69,260 men for about 13 years and the 77,462 women for about 16 and compared their behaviors to their health. Study researchers point towards a relationship between weight gain and treatment. In addition, those diagnosed with cancer during the course of the study were found to be statistically more likely to gain 11lbs or more than those without cancer.

Sitting for a long time is linked with a variety of diseases, including an increased risk of Type 2 diabetes and cardiovascular disease.

While weight has been implicated in possibly playing some role in certain cancers, this study is among the first to tease apart what effect cancer itself, and treatments for cancer, might have on changing metabolism, inflammation, the immune system and other body functions to make weight gain more likely.

Patel and his research team raised concerns about how today’s generation is leading a more static and immobile life, when it comes to home recreation or private leisure time.

Visvanathan said that the key takeaway for doctors is that they and the women should know the risk for weight gain and keep track of the weight. The researchers controlled for multiple factors including BMI and physical activity levels. Now, a new study finds that sitting may be particularly harmful for women by raising their risk of developing several cancers.

Proper adjustments in treatments or perhaps switching to hormonal therapy, when it’s possible, might lower the risk of the cancer returning and prevent fewer women from undergoing the same procedures ever again.