The prognosis of breast cancer in young women is strongly influenced by their reproductive history. Women diagnosed within 5 years postpartum, for example, generally have a worse prognosis than nulliparous women or women diagnosed during pregnancy.In an article published online in journal Nature Medicine (Aug. 7, 2011) researchers reports that nonsteroidal anti-inflammatory drugs(NSAIDs) including ibuprofen may help reduce the severity of postpartum breast cancers. The results are based on mouse models of postpartum breast cancer.

Not a preventative therapy or cancer treatment
?We caution patients and providers that because a mother?s body is undergoing radical changes during this time, we can?t yet speak to the safety of these drugs for women diagnosed with or at risk for postpartum breast cancer, and thus can?t yet recommend NSAIDs as a preventative therapy or cancer treatment,? says Pepper Schedin, PhD, investigator at the University of Colorado Cancer Center and professor in the division of medical oncology at the University of Colorado School of Medicine, who teamed up on this study with Virginia Borges, MD, an expert in young women?s breast cancer who is also at the Cancer Center. First authors of this important paper are University of Colorado trainees, Drs. Traci Lyons and Jenean O?Brien.

Breast cancer more prevalent in young mothers
The story starts with breast involution ? the process by which milk-producing cells that are no longer needed are killed and replaced with fat cells. During this time of change, the breast is especially susceptible to the development of cancer. In fact, recent studies show that women who have children before age 30 increase their risk of pre-menopausal breast cancer by 10% and women who wait to have children until after age 35 increase their risk by 30%. Not only is breast cancer more prevalent in young mothers than women who have not had a child, but cancers diagnosed in the early years postpartum tend to be more aggressive, with increased risk of spreading to other organs. For example, one study reported that women diagnosed with cancer within two years of giving birth had a 40% five-year survival rate, as opposed to a 70% five-year survival rate for women diagnosed outside the postpartum window.

Increase of cyclooxygenase-2
What this University of Colorado research team discovered is that breast involution shares similarities with wounds, and wounds can cause cells to become cancerous in addition to promoting metastasis of otherwise localized tumor cells. Two wound-like changes that occur in the postpartum breast are an increase in fibrous collagen, the protein that gives our flesh structure, and increase of an enzyme called cyclooxygenase-2 or COX-2.

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Growth and spread of cancers
In addition to causing inflammation and pain, COX-2 aids the formation of fibrous collagen, which in the process of wound healing serves as a highway along which healthy skin cells travel in order to close the wound. However, this collagen also forms a rich architecture for the growth and spread of cancers. In short, breast involution leads to COX-2, which leads to fibrous collagen, which promotes the release of more COX-2, and this positive feedback loop can help a tumor grow and push into other tissues.

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Inflammatory diseases
It?s a vicious chain, but one with a weak link: many drugs exist that inhibit COX-2. These include the non-steroidal anti-inflammatories (NSAIDs), such as ibuprofen, or celecoxib, which is a more targeted COX-2 inhibitor used in other inflammatory diseases like arthritis. ?Inhibition of COX-2 slows the formation of fibrillar collagen and thus both tumor growth and the tumor?s travel into the lung,? write Schedin and collaborators. Sure enough, Schedin and the research team found that in postpartum mice, ibuprofen and celecoxib treatment reduced mammary tumor size, collagen architecture, COX-2 expression, and breast tumor cell spreading into the lung.

More research required
However, recommending ibuprofen for women undergoing breast involution is premature. Schedin and Borges point out that early studies of vitamin A in lung cancer and vitamin E in prostate cancer at first found the vitamins to be cancer-fighting but eventually showed them to be cancer-promoting. ?It becomes a numbers game,? says Borges, ?with the benefit of the drug weighed against its dangers. It seems as if the safety of these drugs is self-evident, but it?s only because we don?t fully understand the effects of NSAIDs during this unique period of a woman?s life, when her body is undergoing dramatic changes. So it becomes very important to study the effects of NSAID treatment in this particular group of women before we can make any prevention recommendations.?

For more information:
Lyons TR, O’Brien J, Borges VF, Conklin MW, Keely PJ, et al. Postpartum mammary gland involution drives progression of ductal carcinoma in situ through collagen and COX-2. Nature Medicine 2011. doi:10.1038/nm.2416. Published online 07 August 2011.

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