Breast Cancer after Prophylactic Bilateral Mastectomy in Women with a BRCA1 or BRCA2 Mutation
Hanne Meijers-Heijboer, M.D., Bert van Geel, M.D., Ph.D., Wim L.J. van Putten, M.Sc., Sonja C. Henzen-Logmans, M.D., Ph.D., Caroline Seynaeve, M.D., Ph.D., Marian B.E. Menke-Pluymers, M.D., Ph.D., Carina C.M. Bartels, M.D., Leon C. Verhoog, M.D., Ans M.W. van den Ouweland, Ph.D., Martinus F. Niermeijer, M.D., Ph.D., Cecile T.M. Brekelmans, M.D., Ph.D., and Jan G.M. Klijn, M.D., Ph.D.
Background Women with a BRCA1 or BRCA2 mutation have a highrisk of breast cancer and may choose to undergo prophylacticbilateral total mastectomy. We investigated the efficacy ofthis procedure in such women.
Methods We conducted a prospective study of 139 women with apathogenic BRCA1 or BRCA2 mutation who were enrolled in a breast-cancersurveillance program at the Rotterdam Family Cancer Clinic.At the time of enrollment, none of the women had a history ofbreast cancer. Seventy-six of these women eventually underwentprophylactic mastectomy, and the other 63 remained under regularsurveillance. The effect of mastectomy on the incidence of breastcancer was analyzed by the Cox proportional-hazards method inwhich mastectomy was modeled as a time-dependent covariate.
Results No cases of breast cancer were observed after prophylacticmastectomy after a mean (±SE) follow-up of 2.9±1.4years, whereas eight breast cancers developed in women underregular surveillance after a mean follow-up of 3.0±1.5years (P=0.003; hazard ratio, 0; 95 percent confidence interval,0 to 0.36). The actuarial mean five-year incidence of breastcancer among all women in the surveillance group was 17±7percent. On the basis of an exponential model, the yearly incidenceof breast cancer in this group was 2.5 percent. The observednumber of breast cancers in the surveillance group was consistentwith the expected number (ratio of observed to expected cases,1.2; 95 percent confidence interval, 0.4 to 3.7; P=0.80).
Conclusions In women with a BRCA1 or BRCA2 mutation, prophylacticbilateral total mastectomy reduces the incidence of breast cancerat three years of follow-up.
The identification of the breast-cancersusceptibilitygenes BRCA11 and BRCA22 evoked widespread interest in genetictesting among women at risk for a mutation in these genes.3,4We found that 57 percent of women without breast cancer whohad a 50 percent chance of carrying a BRCA1 or BRCA2 mutationrequested genetic testing.4 This result indicates the need todetermine the efficacy of the various options for reducing therisk of breast cancer and for early detection in women witha BRCA1 or BRCA2 mutation.
Women with a BRCA1 or BRCA2 mutation have a cumulative lifetimerisk of invasive breast cancer (up to the age of 70 years) of55 to 85 percent and of invasive epithelial ovarian cancer of15 to 65 percent.5,6 In these women the risk of breast cancerbegins to increase near the age of 25 years, and their overallsurvival once breast cancer does develop is similar to thatof age-matched patients with sporadic cases of breast cancer:in both, the 10-year survival rate is about 50 percent.7,8
Current risk-reduction strategies for women with a BRCA1 orBRCA2 mutation include regular surveillance; prophylactic mastectomy,oophorectomy, or both; and chemoprevention.9,10,11 In our experience,50 percent of women who have a BRCA1 or BRCA2 mutation havechosen to undergo prophylactic bilateral mastectomy.4 Untilnow, however, there have been only retrospective studies ofthe efficacy of the procedure in women with an increased riskof breast cancer on the basis of the family pedigree and notDNA testing.12
We investigated the efficacy of prophylactic mastectomy in womenwith a proven pathogenic BRCA1 or BRCA2 mutation. Because arandomized trial is impossible for ethical reasons, we performeda prospective cohort study of women at a single institutionwho chose either prophylactic mastectomy or regular surveillance.
Methods
Study Subjects
Beginning on January 1, 1992, we studied all women with a BRCA1or BRCA2 mutation who were being monitored for breast cancerbecause of familial clustering of breast cancer, ovarian cancer,or both at the Daniel den Hoed Cancer Center in Rotterdam, theNetherlands. We included all women who had been given a moleculardiagnosis before January 1, 2000. Women with a BRCA1 or BRCA2mutation in whom breast cancer developed before January 1, 1992,and one woman in whom breast cancer was detected at the firstscreening were excluded. The date January 1, 1992, was chosenbecause at that time, a multidisciplinary team at our familycancer clinic took over the care of women at high risk for breastcancer. A total of 139 women fulfilled the criteria. Eventually,76 of these women chose to undergo prophylactic bilateral mastectomybefore the end of the follow-up period (March 1, 2001), whereasthe other 63 women chose to remain under regular surveillance.In all but two women prophylactic mastectomy was performed afterthe molecular diagnosis was established.
Data Collection and Follow-up
Information on vital status and the occurrence of cancer wasextracted from the women's medical files. All women were regularlymonitored at our clinic until March 1, 2001, and were enrolledin clinical research programs approved by our medical ethicscommittee (protocol DDHK 91-17, updated in 1995). We obtainedpathology reports of all mastectomy specimens and of all breast-biopsyspecimens from the women who were being monitored. Informationon oophorectomy performed for any reason (mostly at our clinic)was obtained from the women themselves and was verified by areview of all medical records. Premenopausal oophorectomy wasdefined as bilateral oophorectomy before the age of 56 yearsand was performed prophylactically in the case of 59 women,for benign disease in the case of 1 woman, for ovarian cancerin the case of 7 women, and for cervical cancer in the caseof 1 woman (Table 1). No women were lost to follow-up afterprophylactic mastectomy. Of the women in the surveillance group,three died of ovarian cancer and two chose to be monitored atanother hospital for practical reasons.
In all cases a standard, bilateral, simple total mastectomy(including the nipple) was performed by a surgical oncologistat the Daniel den Hoed Cancer Center. In 74 of the 76 women,the breasts were reconstructed with silicone prostheses by aplastic surgeon in the same session, followed later by a nipplereconstruction.
According to national guidelines, regular surveillance for breastcancer consists of a monthly breast self-examination, a clinicalbreast examination every six months, and yearly mammography.Since 1995, magnetic resonance imaging (MRI) has been an optionat our clinic for women with mammographically very dense tissueand those with a BRCA1 or BRCA2 mutation. When indicated, ultrasonographywith or without fine-needle aspiration was also performed. Theage at entry into the surveillance program was generally 25years or younger in women with relatives in whom breast cancerhad been diagnosed before the age of 30 years.
To rule out overt breast cancer at the time of prophylacticmastectomy, any or all of the following were performed no morethan three months before surgery: a physical examination ofthe breast, mammography, or MRI. After prophylactic mastectomy,the chest wall and regional lymph nodes were examined everysix months. In most women, computed tomography of the chestwas performed one year after prophylactic mastectomy.
Analysis of BRCA1 and BRCA2 Mutations and Histologic Examination
DNA analysis was performed according to standard procedures.13,14,15BRCA1 and BRCA2 linkage analysis was used until 1994 and 1995,respectively, to identify the presence of hereditary breastcancer; from 1994 to 2000 we used direct mutation analysis.All BRCA1 and BRCA2 mutations were pathogenic, since they resultedin a premature truncation of the BRCA1 or BRCA2 protein.
Mastectomy specimens were examined histologically to rule outthe presence of occult breast cancer. From each quadrant ofthe specimen, microscopical sections from three random blockswere examined according to standard procedures.
Statistical Analysis
We used a chi-square test and a t-test to compare the characteristicsof the group of 76 women who chose to undergo mastectomy withthose of the 63 women who opted to continue being monitored.We used a Cox proportional-hazards model to analyze the effectof prophylactic mastectomy on the incidence of breast cancer,with prophylactic mastectomy included as a time-dependent covariate.To adjust for the potential effect of a change in menopausalstatus, either through premenopausal oophorectomy or throughnatural menopause (defined as occurring at the age of 56 years),we included menopausal status in the model as a time-dependentcovariate. The women were followed from January 1, 1992, orfrom the time of the first visit after that date at our clinicuntil the occurrence of breast cancer or death, the end of follow-upat our clinic, or the end of the study (March 1, 2001). We determinedthe number of woman-years at risk for breast cancer in variousage cohorts in the two groups; in this analysis we includedin the surveillance-group data the number of years of surveillancein the women in the mastectomy group before prophylactic mastectomywas performed. The numbers of woman-years at risk were usedto calculate the numbers of breast cancers expected on the basisof published estimates for women with a BRCA1 mutation.16 Wecalculated 95 percent confidence intervals assuming a Poissondistribution. We used the method of Kaplan and Meier to calculatethe actuarial probability of breast cancer during the surveillanceperiod. We compared these probabilities with the cumulativeincidence, assuming that the model was an exponential one witha constant hazard rate, in order to have more stable estimateswith longer follow-up.
A two-sided P value of less than 0.05 was considered to indicatestatistical significance. All analyses were performed with theuse of SPSS and Stata software.
Results
Characteristics of the Women
Table 1 lists the general characteristics of the women who choseto undergo prophylactic mastectomy and those who opted for surveillance.Significantly more women in the mastectomy group than in thesurveillance group had undergone a premenopausal oophorectomy(44 vs. 24 [58 percent vs. 38 percent], P=0.03). All gynecologiccancers occurred before the age of 56 years; the two such casesin the mastectomy group were ovarian cancer, stage IC. Therewere no significant differences between the two groups withrespect to age, average duration of follow-up after entry intothe study, follow-up after premenopausal oophorectomy, and typeof mutation. The 26 distinct mutations 23 in BRCA1 and3 in BRCA2 were distributed in a similar fashion inthe two groups. The 139 women were from a total of 70 families;the number of women from each family ranged from 1 to 5.
The mean (±SE) duration of follow-up was 2.9±1.4years (219 woman-years) in the mastectomy group and 3.0±1.5years (190 woman-years) in the surveillance group (Table 1).The total number of woman-years of surveillance increased from190 to 318 when the 128 woman-years of surveillance before prophylacticmastectomy was added.
Incidence of Breast Cancer
After prophylactic mastectomy no case of invasive breast cancerwas observed in any of the 76 women during 219 woman-years atrisk (Figure 1). In the surveillance group eight invasive breastcancers were detected during 318 woman-years at risk, for ayearly incidence of 2.5 percent. The ratio of observed casesto expected cases was 1.2 (8 vs. 6.7; 95 percent confidenceinterval, 0.4 to 3.7; P=0.80). All the affected women were fromdifferent families. The actuarial mean five-year incidence ofbreast cancer in the women in the surveillance group (Figure 1)was 17±7 percent, but the number of women at riskat five years was only eight. To obtain a more stable estimatewith longer periods of follow-up, we calculated cumulative incidenceprobabilities with the use of an exponential model in whichthe hazard rate was assumed to be constant. According to thismodel, the yearly incidence of breast cancer was 2.5 percentand the five-year cumulative incidence was 12 percent (95 percentconfidence interval, 6 to 23 percent) (Figure 1). Disregardingthe years of surveillance before prophylactic mastectomy andthus restricting the actuarial analysis to the 63 women in thesurveillance group, we estimated that the five-year risk ofbreast cancer was 24±9 percent.
Figure 1. Actuarial Incidence of Breast Cancer among Women with a BRCA1 or BRCA2 Mutation after Prophylactic Mastectomy or during Surveillance.
The surveillance group includes data obtained before prophylactic mastectomy in 76 of the 139 women. The dashed line represents the probability of breast cancer during surveillance, and the dotted lines the 95 percent confidence interval. Values were calculated with the use of an exponential model in which the hazard rate was assumed to be constant.
Cox proportional-hazards analysis showed that mastectomy significantly(P=0.003) decreased the incidence of breast cancer (hazard ratio,0; 95 percent confidence interval, 0 to 0.36). After adjustmentfor the change in menopausal status, the protective effect ofmastectomy remained statistically significant (P=0.01).
Outcome in the Women with Breast Cancer
None of the eight patients in the surveillance group in whombreast cancer developed had been scheduled to undergo prophylacticmastectomy at the time of the diagnosis. The characteristicsof the women and the tumors are described in Table 2 and Table 3,respectively. Patients 7 and 8 underwent bilateral oophorectomy14 and 12 months, respectively, before the diagnosis of breastcancer. Of the eight cancers, four (in Patients 1, 2, 4, and6) were detected between screening sessions (so-called intervalcancers). In these four patients the interval from screeningto diagnosis was two to five months. The cancers in the otherfour patients (Patients 3, 5, 7, and 8) were detected duringa screening session. Patient 1 became symptomatic eight weeksafter her first clinical breast-cancer screening, the resultsof which were negative. In four of the eight patients, breastcancer was detected before the molecular diagnosis was made.
Table 3. Characteristics of the Tumors in the Eight Women in the Surveillance Group in Whom Breast Cancer Developed.
Histologic Findings in the Mastectomy Group
Invasive cancer was not detected in any of the specimens obtainedat the time of prophylactic mastectomy. One 44-year-old womanwith a BRCA1 mutation had lobular carcinoma in situ.
Discussion
In this prospective study we assessed the incidence of breastcancer in 139 women with a BRCA1 or BRCA2 mutation who choseto undergo either prophylactic mastectomy or regular surveillance.Whereas breast cancer developed in 8 of 63 women in the surveillancegroup, no cases of breast cancer occurred among the 76 womenwho underwent prophylactic mastectomy. The observed number ofbreast cancers in the group under surveillance is compatiblewith the reported incidence of breast cancer in women with aBRCA1 or BRCA2 mutation.16 As compared with the incidence inthe surveillance group, the incidence of breast cancer in theprophylactic-mastectomy group was significantly reduced (P=0.003),but the mean follow-up of three years calls for a cautious interpretationof our results.
Until now, only retrospective studies of the outcome of prophylacticmastectomy (mainly subcutaneous, and thus often incomplete)have been published.12 Hartmann et al.17 reported the resultsof prophylactic bilateral mastectomy in 639 women with a familyhistory of breast cancer; at least 12 of these women had a BRCA1or BRCA2 mutation.18 After a median follow-up of 14 years, therewas an approximate 90 percent reduction in the risk of breastcancer; the risk of death was also reduced significantly. Allseven breast cancers occurred after subcutaneous bilateral mastectomy;there were none after total mastectomy.17 Moreover, breast cancerdid not develop in any of the women with a confirmed BRCA1 orBRCA2 mutation after a median follow-up of 16 years,18 whichleads us to anticipate that prophylactic mastectomy will reducethe long-term risk of breast cancer in the women with a BRCA1or BRCA2 mutation whom we studied.
It is uncertain whether mammographic surveillance of premenopausalwomen with a BRCA1 or BRCA2 mutation contributes substantiallyto early detection of breast cancer.19 Considering the women'syoung age in our study cohort and the stage and pathologicalcharacteristics of their breast cancers at diagnosis, we estimatethat 35 to 50 percent of women under surveillance in whom primarybreast cancer develops will die of distant metastasis within10 to 15 years.7,8 Assuming that within 10 years breast cancerwill develop in approximately 25 percent of the women undergoingregular surveillance, we estimate that 10 to 20 percent of womenwho choose surveillance will die of breast cancer within 20years. During the three years of follow-up in our study, therewas one death due to breast cancer (Table 2).
Currently, several large, prospective studies are investigatingwhether MRI screening adds to the efficacy of mammographic screeningin women at high risk for breast cancer.20,21 In our study MRIwas performed in six women at the time of diagnosis and detectedall six cancers, but mammography was diagnostic in only twoof the eight women with breast cancer. In view of the high numberof interval cancers (four of eight), the use of high-resolutionimaging and more frequent screening might be useful in womenwith a BRCA1 or BRCA2 mutation.
There is little in the literature on the histologic findingsin specimens obtained at the time of prophylactic mastectomyfrom women with a BRCA1 or BRCA2 mutation. In two studies, inabout 35 percent of unaffected high-risk women, proliferativebreast disease (marked or atypical hyperplasia) was found inthe surgical specimens.22,23 This abnormality was found in specimensfrom only 13 percent of women with an average risk of breastcancer.23 In two women with a strong family history of breastcancer, microcalcifications and invasive breast cancer weredetected within one year after the finding of proliferativedisease.23 In contralateral specimens obtained at the time ofprophylactic mastectomy from women with prior breast cancerand either a genetic risk or a family history of breast cancer,a higher prevalence of malignant lesions was observed.9,22 Inour study, there was one carcinoma in situ and several prophylactic-mastectomyspecimens with various degrees of hyperplasia and atypia. However,we cannot exclude the possibility that small invasive tumorswere overlooked.
In our study all eight breast cancers occurred in women witha BRCA1 mutation. This finding may be partly explained by thefact that only about 10 percent of the woman-years of surveillancewere accounted for by women with BRCA2 mutations.
Apart from surveillance and prophylactic mastectomy, women witha BRCA1 or BRCA2 mutation may choose to undergo bilateral oophorectomybefore menopause, chemoprevention, or both to reduce the riskof breast cancer. Such interventions may reduce the risk ofbreast cancer by about 50 percent,24,25,26 but the use of tamoxifenas a preventive agent has been questioned in view of its long-termside effects.27
Prophylactic mastectomy is a highly personal decision. In counselinghigh-risk women, the protective effect of prophylactic mastectomymust be weighed against possible surgical complications andpsychological problems. Up to 30 percent of the women who undergothe procedure will have surgical complications, depending onthe type of surgery and the length of follow-up.12,28 A long-termstudy of prophylactic mastectomy reported unanticipated repeatedoperations in 49 percent of women,29 but these results may notbe applicable to prophylactic mastectomies as they are currentlyperformed. Psychological studies of women who had undergonea prophylactic mastectomy did not find that, overall, the procedurehad detrimental effects on body image and sexuality.30,31,32,33
In conclusion, our data and those of Hartmann et al.17,18 indicatethat prophylactic bilateral total mastectomy substantially reducesthe incidence of breast cancer among women with a BRCA1 or BRCA2mutation. Nevertheless, longer follow-up and studies of morepatients are required to establish the protective effect anddetermine the long-term complications of this procedure.
Supported in part by a grant from the Dutch Cancer Society (DDHK95-953) and by a grant from the Dutch Government (ZON 2100.0013).
We are indebted to Madeleine Tilanus-Linthorst and Lia van Zuylenfor conducting surveillance; to Rudy Tjong Joe Wai for breastreconstruction in the patients; to Mieke Kriege and Leon Aronsonfor assistance with data analysis; to Ellen Crepin and Ann Claessensfor data collection; to Dicky Halley and Peter Devilee for mutationanalysis; and to Petra Bos for assistance with the preparationof the manuscript.
Source Information
From the Departments of Medical Oncology (H.M.-H., C.S., L.C.V., C.T.M.B., J.G.M.K.), Surgery (B.G., M.B.E.M.-P., C.C.M.B.), Statistics (W.L.J.P.), Clinical Genetics (H.M.-H., A.M.W.O., M.F.N.), and Pathology (S.C.H.-L.), Erasmus University Medical Center, Rotterdam, the Netherlands.
Address reprint requests to Dr. Klijn at the Rotterdam Family Cancer Clinic, Department of Medical Oncology, Dr. Daniel den Hoed Kliniek, Erasmus University Medical Center Rotterdam, Groene Hilledijk 301, 3075 EA Rotterdam, the Netherlands, or at bos{at}onch.azr.nl.
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