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Other Systemic Disease
Very few published studies have medically evaluated enough women with implants for enough years to determine whether implants cause other systemic diseases in the long-term. Two recent federally funded studies by scientists from the NCI have demonstrated a link between implants and cancer, lung diseases, and suicide. One of the studies found that women with breast implants are more likely to die from brain tumors, lung cancer, and suicide compared with other plastic surgery patients.[33]
The other study found a 21% overall increased risk of cancer for women with implants, compared with women of the same age in the general population.[34] The increase was primarily due to an increase in brain cancer, respiratory tract cancers, cervical cancer, leukemia, and vulvar cancer. The dramatic findings regarding lung disease and brain cancer were described as "unexpected" by the authors, but the findings are consistent with other newly published research.
For example, the previously described FDA study of women with ruptured breast implants reported an increase in pulmonary fibrosis for women with ruptured and leaking implants,[11] and another recent NCI study reported an increase in fatal lung diseases.[33] A recent case report, published by the Royal Academy of Medicine in Scotland, found that a woman with a broken silicone gel implant in her calf was coughing up silicone that was identical to the kind in her implant.[35]
The physicians involved believe that this case report suggests that silicone from a ruptured gel implant can migrate to the lungs.
Unlike many other studies of women with implants, the federally funded epidemiologic studies controlled for potentially confounding variables such as smoking and social class and included 2 comparison samples: the general population of women in the same age range, and a population of other plastic surgery patients.
The results of the 2 NCI studies indicated that women with breast implants, like other plastic surgery patients, tend to live longer than other women, apparently because women who will undergo plastic surgery tend to have relatively good baseline health and can afford adequate healthcare.
However, implant patients were more likely to die from the diseases mentioned above than other plastic surgery patients. Therefore, a recent article in Medscape (April 26) titled "Augmentation Mammoplasty Associated with Reduced Mortality" was misleading.
Alternatives to Silicone Gel Breast Implants
When silicone gel breast implants were allowed to remain on the market in 1992 as a "public health need," the main concern was to keep this option for mastectomy patients. However, since that time, the number of women getting mastectomies rather than breast-conserving surgery has decreased dramatically, and the number of women choosing autologous tissue transfer instead of implants has increased exponentially.[36]
And, in 2000, saline-filled breast implants were approved by the FDA; saline implants became a popular alternative to silicone gel after silicone gel implants were restricted in the early 1990s.
The Importance of Empirical Research
Many plastic surgeons and implant patients believe that silicone gel breast implants are safe. Medical opinion is not the standard for selling medical products in the United States, however. A recent example involving a different kind of breast implant illustrates the importance of empirical research. Trilucent breast implants, which have a soybean oil-based filler, were designed to interfere less with mammograms than saline or silicone implants.
In recent years, these products were widely praised by the doctors who used them (mostly in the United Kingdom) and were embraced as the safe alternative to silicone implants by women and the media. The manufacturers had not sought FDA approval, however, and some plastic surgeons and patients criticized the FDA because the implants were not widely available in the United States.
In 2000, Trilucent implants were removed from the market when serious problems were reported. The soya oil implants were found to cause swelling and, in some cases, leaking soybean oil had emulsified and turned rancid.[37]
Moreover, the Trilucent implant filler was found to break down into aldehydes, which are genotoxic, raising concerns that the implants could increase cancer risk or reproductive toxicity. Because implant leakage or rupture would lead to increased exposure, the British Medical Device Agency advised women to avoid pregnancy until their Trilucent breast implants were removed.
They also recommended that breastfeeding be avoided because the toxic chemical could migrate from the implants to the milk.[38]The removal of Trilucent implants from the market, after doctors and patients involved had enthusiastically praised them, serves as a reminder that the long-term risks of implants are not always obvious during the first few years of use.
That is why studies of the risks of long-term use are essential to establish the safety of implants, and why it is important to refrain from drawing conclusions until objective, comprehensive, long-term research is completed.
In summary, some of the most recent research raises serious questions about the long-term safety of breast implants, and most of the conclusions of the Medscape editorial are based on shorter-term studies that examined relatively few women and relatively few diseases.
The fact that silicone gel implants can rupture without warning, and the silicone can migrate to organs where it can't be removed, raises concerns. Since the health risks of broken implants have been evaluated in only 1 study -- which found a statistically significant link to disease -- this should raise the threshold when the FDA finally reconsiders whether to approve silicone gel implants.
The bottom line, however, is that the studies that have been published thus far are not the basis for approval or disapproval of silicone gel implants. The law requires that the review of silicone gel implants must be based only on studies of the specific types of implants that are seeking approval -- not of implants no longer on the market, or studies of women with implants made by a variety of manufacturers.
Since the currently used implants have been on the market for more than a decade, the FDA review should include long-term data, and an assessment of the health of women with ruptured implants, to examine whether systemic diseases are linked to long-term implant use.
References
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10.US Food and Drug Administration. Saline-Filled Breast Implant Surgery: Making an Informed Decision (Mentor Corporation). Available at: http://www.fda.gov/cdrh/breastimplants/labeling/mentor_patient_labeling_5900.html. Accessed October 18, 2001.
11.Brown SL, Pennello G, Berg WA, Soo MS, Middleton MS. Silicone gel breast implant rupture, extracapsular silicone, and health status in a population of women. J Rheumatol. 2001;28:996-1003.
12.Brown SL, Middleton MS, Berg WA, Soo MS, Pennello G. Prevalence of rupture of silicone gel breast implants revealed on MR imaging in a population of women in Birmingham, Alabama. AJR Am J Roentgenol. 2000;175:1057-1064.
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24.Nyren O, Yin L, Josefsson S, et al. Risk of connective tissue disease and related disorders among women with breast implants: a nation-wide retrospective cohort study in Sweden. BMJ. 1998;316:417-422.
25.Schusterman MA, Kroll SS, Reece GP, et al. Incidence of autoimmune disease in patients after breast reconstruction with silicone gel implants versus autogenous tissue: a preliminary report. Ann Plast Surg. 1993;31:1-6.
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27.Aziz NM, Vasey FB, P.E. L, Other E. Comparison of clinical status among women retaining or removing gel breast implants. American College of Epidemiology Annual Scientific Session. Boston, MA; 1998.
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30.Silverstein MJ, Handel N, Gamagami P, Waisman E, Gierson ED. Mammographic measurements before and after augmentation mammaplasty. Plast Reconstr Surg. 1990;86:1126-1130.
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35.James SE, Tarr G, Butterworth MS, McCarthy J, Butler PE. Silicone in the sputum after rupture of a calf implant. J R Soc Med. 2001;94:133-134.
36.Zuckerman DM. The need to improve informed consent for breast cancer patients. J Am Med Womens Assoc. 2000;55:285-289.
37.Laurance J. Agonizing wait for 5,000 women told that their breast implants might leak and cause cancer. The Independent. June 7, 2000. Available at: http://www.independent.co.uk/story.jsp?story=5864. Accessed October 18, 2001.
38.Statement on the Safety of Trilucent Breast Implants: UK Medical Devices Agency. Available at: http://www.medical-devices.gov.uk/. Accessed October 18, 2001. Acknowledgements
The author thanks Rachael Flynn, MPH, and Jae Hong Lee, MD, MPH, for their comments, suggestions, and research assistance.
Diana Zuckerman, PhD, is trained in epidemiology and psychology, and is President of the National Center for Policy Research (CPR) for Women & Families in Washington, DC.
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