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TUESDAY, March 1 (HealthDay News) -- Both respiration and danger to secondhand respiration materialize to process the venture for boob cancer among postmenopausal women, new investigate shows.

Although primeval studies had institute little or no unification between breast cancer and smoking, as more women smokers reach climacteric the connection haw be surfacing for the prototypal time, experts noted.

"The findings are essential because respiration was not previously thought to process the venture of boob cancer, but this think adds to the increasing grounds that it does," said lead researcher Dr. Karen Margolis, a grownup clinical policeman at HealthPartners Research Foundation in Minneapolis.

However, Susan Gapstur, evilness chair of epidemiology for the American Cancer Society, said primeval investigate had shown whatever unification between smoking and boob cancer.

"When you place together the embody of impact in the terminal few years, it calls for more studies," she said. "This think has answered that call."

"This trusty adds to the grounds that long-term respiration increases the venture for boob cancer," Gapstur said. "On the on the flip side, it appears that 20 eld after stopping the venture goes downbound to that of an average individual. I think that's good news."

Many venture factors for boob cancer cannot be changed, much as age, genetics and family story of the disease, Margolis noted.

"Now respiration crapper be additional to the list of things that crapper modify boob cancer venture that already include having children, breast-feeding, keeping alcohol activity low, avoiding coefficient gain, being physically astir and avoiding catecholamine therapy with estrogen nonnegative progestin," she said.

The inform is published in the March 1 online edition of the BMJ.

For the study, Margolis's group composed data on 79,990 women aged 50 to 79 who took part in the Women's Health Initiative study. Over 10 eld of follow-up, 3,250 women matured boob cancer.

As part of the study, the women were asked if they smoked, had stopped smoking or had never smoked. The women were also asked about their exposure to old respiration at bag and at work.

The researchers institute that women who preserved had a 16 proportionality accumulated risk of nonindustrial boob cancer. Among women who quit, the accumulated venture was 9 percent, they added.

The greatest venture was for women who had preserved for 50 eld or longer, compared with women who never smoked, Margolis's aggroup found. The venture was also broad for women who started respiration when they were teenagers. Even after quitting, the venture continued for up to 20 years, the researchers noted.

"We also observed whatever grounds that extensive danger to supine smoking haw raise the venture of boob cancer," Margolis said.

Nonsmokers exposed to old respiration for more than 10 eld as children, more than 20 eld as adults at bag and more than 10 eld at work had a 32 proportionality accumulated venture of nonindustrial boob cancer, the researchers found.

However, the unification between boob cancer and old respiration was seen in those exposed to the greatest turn of supine respiration and "therefore more investigate is necessary to confirm these findings," the researchers noted.

Dr. Paolo Boffetta, help administrator of the Tisch person Institute and Institute for Transitional Epidemiology at Mount desert School of Medicine in New royalty City and co-author of an concomitant journal editorial, said that "tobacco smoking, particularly when started primeval in life, haw increase the venture of boob cancer."

"This grounds is becoming stronger and stronger," he said. "In previous studies, the grounds was not so strong. It is only today that women who started respiration in large numbers are effort to the geezerhood where the venture of boob cancer is effort high."

Right now, the association between respiration and boob cancer is still not a trusty thing, Boffetta said, "but, it is effort more likely."

More information

For more aggregation on boob cancer, meet the American person Society.

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