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7 Genetic Predispositions andProphylactic Mastectomy inBreast Cancer Patients
Данная книга находится в списке для перевода на русский язык сайта https://meduniver.com/
63
years, younger women with breast cancer have a pervasive tendency towards genetic testing. Thus, the prevalence of the mutation carriers has been revealed to screen possible risk factors and to provide early diagnosis and treatment. American Society of Clinical Oncology (ASCO), National Comprehensive Cancer Network (NCCN), and European Society for Medical Oncology (ESMO) guidelines provide invaluable informa­tion for identifying possible candidates and eligi­bility criteria for genetic testing [2931].
NCCN guidelines recommend genetic test­ing for individuals at risk in a broad spectrum including: breast cancer aged 45 up to 50years; triple- negative molecular-type aged ≤60 years; Ashkenazi Jewish at any age; two or primary breast cancer history; ovarian epithelial or fal­lopian tube cancer, or primary peritoneal can­cer; breast cancer at any age with rst-, second-, third-degree relative diagnosed breast cancer 50years; male breast cancer; exocrine pancreas cancer at any age; high-grade with Gleason score >7 or metastatic prostate cancer. Guidelines have also expanded the suggestions for genetic testing in patients who are at risk for hereditary breast and/or ovarian cancer (HBOC). Patients with a close blood relative to whom genetic testing was interpreted as a pathologic/likely pathogenic variant in a susceptibility gene are referred for cascade testing to demonstrate germline status of high- and moderate-penetrance gene mutations for the patient and family members. Centers for Disease Control and Prevention have considered cascade testing as a tier 1 genomic application for patients with Lynch syndrome and HBOC [23,
32]. Previously limited testing for patients meet-
ing the criteria above resulted in 6–10% of misdi­agnosis in mutation rates of BRCA1 and BRCA2 genes, especially before 2006. Multigene testing is highly recommended for previously tested individuals to determine potential mutations in other breast cancer susceptibility genes. In addi­tion to these recommendations mentioned above, The American Society of Breast Surgeons has suggested that genetic testing has to be appli­cable for individuals with a personal history of breast cancer [33].
7.3 Hereditary Breast Cancer Surveillance andRisk­Reducing Treatments
7.3.1 Surveillance
Identication of a pathological and/or likely pathological mutation in a specic allele and genetic inheritance renders possible surveil­lance and early management of the risk-reducing therapeutic options for patients with or without breast cancer. Surveillance should be prioritized depending on patients’ age, personal and familial history of breast and other cancer, the rst onset of cancer in a family member, and expectations of childbearing [30]. BRCA mutation carriers must consider breast awareness and self- examination starting at age 18, regular expert clinical breast examination every 6–12months starting at age 25, and contrast-enhanced magnetic resonance imaging (MRI) annually starting at age 25–29 followed by annual mammography (MG). Adjunctive utilization of MG and MRI increases the detection rates of breast cancer in the early stages up to 94% and decrease mortality rates at 5 years [34]. A recent meta-analysis, which stratied patients by mutation status and age, has demonstrated the contribution of MG to MRI resulted in a 3.9 and 12.6% increase in screening sensitivity of BRCA1 and BRCA2 mutation car­riers, respectively. Besides, adjunctive MG also contributes to screening sensitivity in BRCA2 mutation carriers under 40years old, indicating that distinct and personal screening scheme has to be taken into consideration according to the mutation status [35].
7.3.2 Chemoprevention
Risk-reducing surgeries and chemoprevention are substantial therapeutic options for high­risk patients carrying a 40–50% lifetime risk of cancer. There are limited data in the literature regarding the preventive benet of hormonal che­moprevention in BRCA1 and BRCA2 mutation carriers. National Surgical Adjuvant Breast and
64
A. Soran and K. Senol
Bowel (NSABP) Breast Cancer Prevention Trial (P-1 trial) has revealed a 62% risk reduction (rel­ative risk [RR] 0.38, 95% CI 0.06–1.56) in breast cancer with tamoxifen in BRCA2 mutation carri­ers, similar to the reduced incidence of estrogen receptor-positive breast cancer among all women [36]. In contrast, tamoxifen did not improve breast cancer incidence among healthy BRCA1 muta­tion carriers aged 35 and older in the P-1 trial (RR
1.67, 95% CI 0.32–10.07). BRCA1 mutation car­riers have a tumor more likely to be high-grade medullary morphology with basal-like immuno­phenotype, which lacks estrogen receptor, pro­gesterone receptor, and human epidermal growth factor receptor-2, and increased tp53, cytokera­tin 5/6, cytokeratin 14/17, and epidermal growth factor [37]. Hormonal chemoprevention is less effective as a risk-reducing option for BRCA1 mutation carriers seeking surveillance without mastectomy. Recent studies proposed decreased rates in ipsilateral recurrence and contralateral breast cancer with adjuvant tamoxifen therapy in BRCA mutation carriers. Preventive benets of aromatase inhibitors in mutation carriers are lacking in the literature; however, extensive che­moprevention studies provided decreased breast cancer risk in high-risk postmenopausal patients with aromatase inhibitor therapy [38, 39].
7.4 Hereditary Breast Cancer andRisk-Reducing Surgery
7.4.1 Bilateral Prophylactic Mastectomy
Risk-reducing surgery in high-risk patients and BRCA mutation carriers yields remarkable suc­cess in preventing the development of primary breast cancer, ipsilateral breast cancer recurrence, contralateral breast cancer, and ovarian cancer. Prophylactic mastectomy (PM) and prophylactic salpingo-oophorectomy (PSO) are the mainstays of the therapeutic procedures with favorable out­comes regarding genetic inheritance. High- and moderate-penetrance genes in mutation carriers present with a 5- to 20-fold increase in breast and subsequent cancers, although it has been shown
that PM reduces the risk of ipsilateral and con­tralateral breast cancer by 90–97% especially in patients with BRCA1 and BRCA2 mutations (Table7.1) [68].
In 1998, Hartmann et al. have conducted a retrospective analysis of 639 women who under­went bilateral PM with the diagnosis of high­and moderate-risk of breast cancer depending on the family history. This study has presented a signicant risk reduction in breast cancer incidence and breast cancer-related deaths in bilateral PM patients compared to the predicted deaths according to the risk-assessment models and incidence of breast cancer in close relatives at a median follow-up time of 15years [47]. The latter study, including a retrospective analysis of BRCA mutation carriers in the same cohort of patients, revealed that bilateral PM was provided complete risk reduction in 26 mutation carriers with no evidence of breast cancer after a median of 13.4years of follow-up [48]. Meijers-Heijboer etal. have demonstrated in a prospective study that bilateral PM in BRCA mutation carriers was consistent with 100% risk reduction in invasive disease during 3 years follow-up, whereas sur­veillance had a 2.5% risk of breast cancer per year [49]. However, this study had a bias in favor of risk-reducing surgery regarding premeno­pausal PSO rates, which were 58% and 38% in bilateral PM and surveillance groups, respec­tively. Prevention and Observation of Surgical Endpoints (PROSE) study group has prospec­tively matched the bilateral PM and surveillance group of patients based on PSO and has conrmed a relative breast cancer risk reduction of 95% in patients with prior or concurrent PSO and 90% in patients with intact ovaries [50]. Domcheck et al. have presented 2482 women who tested positive for BRCA1 and BRCA2 mutation with similar breast cancer risk reduction in both bilat­eral PM and PSO group. However, breast can­cer incidence was signicantly reduced among BRCA1 patients who had a PSO before 50years old (HR=1.36; 95% CI: 0.26–7.05, p =0.02). PSO and bilateral PM have also signicantly reduced the breast cancer incidence in BRCA1 and BRCA2 mutation carriers without previous breast cancer, but PSO did not affect ipsilateral
7 Genetic Predispositions andProphylactic Mastectomy inBreast Cancer Patients
Данная книга находится в списке для перевода на русский язык сайта https://meduniver.com/
Clinical breast examination
every 6–12months starting
at age 25years, or 10years
before the rst onset of
cancer in a relative, annual
contrast-enhanced MRI
starting at age 25 with the
addition of mammography
starting at age 30
Recommend risk-reducing
salpingo-oophorectomy at
age 35–40, consider
risk-reducing mastectomy
Clinical breast examination
every 6–12months starting
at age 20–25years, annual
contrast-enhanced MRI
starting at age 20–75 or if
MRI is unavailable,
mammography may be
considered starting at age 30
Consider risk-reducing
Breast cancer management and surveillance
NCCN recommendations [29] ESMO recommendations [30]
Breast awareness at age 18
Clinical breast examination every
6–12months starting at age
20–25years or individualized based
on breast cancer history in a relative
before 30years
Annual mammography with
consideration of tomosynthesis,
annual contrast-enhanced MRI
starting at age 30–75years
Recommend risk-reducing
salpingo-oophorectomy between 35
and 40years
Consider risk-reducing mastectomy
Clinical breast examination every
6–12months starting at age 20years,
annual contrast-enhanced MRI at age
20–29years
Annual contrast-enhanced breast
MRI or mammography at age
30–75years
Consider risk-reducing mastectomy
Avoid therapeutic radiation therapy
mastectomy
Avoid radiation therapy
Clinical breast examination
Clinical breast examination every
65
every 6–12months starting
at age 20–25years, annual
contrast-enhanced MRI
starting age at 20–29, annual
MRI and/or mammography
starting at age 30–75years
Consider risk-reducing
mastectomy
6–12months starting at age
20–25years
Annual mammography with
consideration of tomosynthesis,
annual contrast-enhanced MRI
starting at age 30years
Consider risk-reducing mastectomy
(continued)
Breast cancer risk and
incidence, median age, and
tumor subtype
Incidence 1/300
Relative risk 11.4
Median age 42years
Triple negative, basal-like
tumors
Incidence 1/800
Relative risk 11.7
Median age 45years
Luminal phenotype tumors
breast cancer (%)
60% by age 70
(95% CI 44–75%)
Associated tumors Lifetime risk of
Genes and associated
for mutation carriers
Table 7.1 Hereditary syndromes and clinical signicance of associated genes in familial breast cancer, and guideline recommendations for risk-reducing and screening options
Gynecologic,
pancreatic and
syndrome
BRCA1, hereditary
breast and ovarian
High-
penetrance
prostate tumors,
Cancer [11, 39, 40]
genes
55% by age 70
(95% CI 41–70%)
melanoma
BRCA2, hereditary
breast and ovarian
Cancer [11, 39, 40]
Incidence 1/5000 to 1/20,000
Relative risk 6.4 (95% CI
4.3–9.3)
Median age 33years (range
22–60)
85% by age 60
(95% CI 60–92%)
[31]
Soft tissue
sarcomas, brain
and
adrenocortical
tumors,
TP53, Li-Fraumeni
syndrome [41, 42]
Increased HER-2 receptor-
positive tumors
medulloblastoma,
leukemia
No increased risk
of ovarian cancer
Incidence unknown
Relative risk 6.6 (95% CI
2.2–19.9)
Median age 53years
Invasive lobular carcinoma
39% by age 80
(95% CI 23–68%)
[22]
Gastric tumors
No increased risk
of ovarian cancer
CDH-1, hereditary
diffuse gastric
Cancer syndrome
[22, 43]
66
Clinical breast examination
every 6–12months starting
at age 20–25years, annual
contrast-enhanced MRI
Breast cancer management and surveillance
NCCN recommendations [29] ESMO recommendations [30]
Clinical breast examination every
6–12months starting at age 20years
Annual mammography with
consideration of tomosynthesis,
starting and/or
mammography starting at
age 30–75, annual
endometrial ultrasound ±
biopsies at age 30–35
Consider risk-reducing
mastectomy and
hysterectomy
Clinical breast examination
every 6–12months starting
annual contrast-enhanced MRI
starting at age 30–35years, or
5–10years before rst onset of
breast cancer in a relative,
endometrial cancer screening starting
at age 35
Consider risk-reducing mastectomy
and hysterectomy
Clinical breast examination every
6–12months starting at age 20years,
at age 20–25years, annual
contrast-enhanced MRI
starting at age 20–29years,
annual breast MRI and/or
mammography starting at
age 30–75years
Consider risk-reducing
mastectomy
Clinical breast examination
every 6–12months starting
Annual contrast-enhanced MRI at
age 20–29years, annual breast MRI
or mammography at age 30–75years
Risk-reducing mastectomy is not
recommended and may be
considered based on family history
Clinical breast examination every
6–12months starting at age 20years
A. Soran and K. Senol
at age 20–25years, annual
contrast-enhanced MRI
starting age at 20–29, annual
MRI and/or mammography
starting at age 30–75years
Consider risk-reducing
mastectomy
Annual mammography with
consideration of tomosynthesis,
annual contrast-enhanced MRI
starting at age 30years
Consider risk-reducing mastectomy
Breast cancer risk and inci-
dence, median age, and tumor
subtype
Incidence 1/200,000
Relative risk is unreliable
Lifetime risk of
breast cancer (%)
77% by age 70
(95% CI 59–91%)
Endometrial,
thyroid,
Genes and associated
syndrome Associated tumors
PTEN, Cowden
syndrome [44, 45]
Table 7.1 (continued)
Median age 42years [34–38,
46–49]
Increased risk of benign
breast changes
gastrointestinal
and renal tumors
No increased risk
of ovarian cancer
Incidence 1/155,000
Relative risk 15.2 (95% CI
7.6–27) (1,113,065)
Median age 37years (range
9–44)
Invasive ductal carcinoma
45% by age 70
(95% CI 27–68%)
Mucocutaneous
pigmentation,
hamartomatous
polyps,
gastrointestinal
system cancers,
STK11, Peutz-
Jeghers syndrome
[50, 51]
pancreas, ovarian,
and other
Incidence 1/100 to 4/100
gynecologic
cancers, gonadal
tumors
Pancreas 35% by age 70
PALB2, familial
Relative risk 5.3 (95% CI
3–9.4)
(95% CI 26–46%)
breast Cancer [24,
52, 53]
7 Genetic Predispositions andProphylactic Mastectomy inBreast Cancer Patients
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Annual endometrial
ultrasound ± biopsies at age
30–35
Consider risk-reducing
hysterectomy and salpingo-
oophorectomy after
completion of childbearing
Clinical breast examination every
6–12months starting at age 20years
Annual mammography beginning at
40years of age with consideration of
annual contrast-enhanced breast
MRI,
Consider risk-reducing hysterectomy
and salpingo-oophorectomy after
completion of childbearing
Clinical breast examination
every 6–12months starting
at age 20–25years, annual
contrast-enhanced MRI
starting age at 20–29, annual
MRI and/or mammography
starting at age 30–75years
Consider annual breast MRI
Consider risk-reducing mastectomy
depending on the family history
Clinical breast examination every
6–12months starting at age 20years
Annual mammography beginning at
40years of age with consideration of
annual contrast-enhanced breast MRI
Consider risk-reducing mastectomy
depending on the family history
Clinical breast examination every
(no evidence regarding the
age of onset)
6–12months starting at age 20years
Annual mammography beginning at
40years of age with consideration of
annual contrast-enhanced breast MRI
Consider risk-reducing mastectomy
depending on the family history
Consider risk-reducing salpingo-
oophorectomy depending on the
67
(continued)
family history
1/370 to 1/3000
Median age 53years
Relative risk 3.95 (95% CI
1.59–8.13)
18.6% by age 70
(95% CI
11.3–26%)
Colon,
endometrium,
ovarian, and
stomach
MSH1, MLH1,
MSH6, PMS2,
EPCAM, lynch
syndrome [54, 55]
Relative risk 3.0 (95% CI
2.6–3.5)
Mean age 50years
Luminal phenotype tumors
28–37% by age 70
(95% CI 20–56%)
Male breast
cancer, stomach,
colon, prostate,
kidney and
thyroid tumors,
sarcoma
CHEK2, familial
breast Cancer,
c.100delC [56–58]
Moderate-
penetrance
genes
Incidence 1/40,000 to
1/300,000
Relative risk 2.8 (95% CI
32.8% by age 80
(95% CI
24.5–40.3%)
No increased risk
of ovarian cancer
Ovarian,
pancreatic, and
prostate tumors
ATM, Familial
Breast Cancer [59]
2.2–3.7)
Median age 40–50years
68
Consider risk-reducing
salpingo-oophorectomy after
the age of 45
Breast cancer management and surveillance
NCCN recommendations [29] ESMO recommendations [30]
Unknown or insufcient data for
breast cancer risk, recommend breast
cancer screening based on the family
history
Consider risk-reducing
salpingo-oophorectomy after
the age of 45
Consider risk-reducing salpingo-
oophorectomy at age 45–50 or
depending on the family history
No evidence of association for breast
cancer risk, recommend breast
cancer screening based on the family
N/A
history
Consider risk-reducing salpingo-
oophorectomy at age 45–50 or
depending on the family history
Annual mammography beginning at
40years of age with consideration of
annual contrast-enhanced breast MRI
Risk-reducing mastectomy and
salpingo-oophorectomy is not
A. Soran and K. Senol
N/A
recommended and may be
considered based on family history
There are no specic management
and surveillance guideline for breast
cancer risk in mutation carriers
Surveillance should be individualized
Breast cancer risk and inci-
dence, median age, and tumor
subtype
Incidence <1/1000
Relative risk for ovarian
Lifetime risk of
breast cancer (%)
9% by age 80 for
ovarian cancer
Ovarian cancer,
lung, kidney,
Genes and associated
syndrome Associated tumors
RAD51 paralog D,
Familial Breast
Table 7.1 (continued)
cancer is 6.3 (95% CI
2.8–13.8)
Median age for ovarian
cancer is 60years
No evidence of association
for breast cancer
Relative risk for breast cancer
brain, pancreatic,
liver, colorectal
tumors
Cancer [60]
RAD51 paralog C,
Familial Breast
Cancer [60]
0.91 (95% CI 0.45–1.86)
Triple-negative breast cancer
Incidence 1/100
Relative risk for ovarian
cancer is 11.2 (95% CI
3.2–34.1)
Median age for ovarian
cancer is 50–55years
5.8% by age 80 for
ovarian cancer
(95% CI
3.6–9.1%)
Ovarian cancer,
Fanconi anemia
BRIP1, Familial
Breast Cancer [61]
Triple-negative breast cancer
Relative risk 3.1 (95% CI
1.4–6.6)
Prostate cancer 20–30% by age 80 Incidence 1/167
NBN, familial breast
Cancer, c.657del5
[62, 63]
Relative risk 2.16 (95% CI
1.31–3.63)
Triple-negative and bilateral
breast cancer [65]
20% by age 80 Incidence <1/1000
Neuroblastoma,
lung and colon
cancer
BARD1, Familial
Breast Cancer [64]
7 Genetic Predispositions andProphylactic Mastectomy inBreast Cancer Patients
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69
N/A
Annual mammography beginning at
30years of age with consideration of
annual contrast-enhanced breast MRI
at age 30–50
Relative risk 2.6 (95% CI
2.1–3.2)
Median age 46years
Invasive ductal carcinoma
N/A
There are no specic management
and surveillance guideline for breast
cancer risk in mutation carriers
Surveillance should be individualized
Breast cancer risk decreases
over 50years
Up to 1.25-fold increase for
heterozygous mutations
Up to 1.65-fold increase for
homozygous mutations
20% by age 80 Incidence 1/3000 to 1/5000
Malignant
peripheral nerve
sheath tumors,
GIST
No increased risk
NF1,
Neurobromatosis
Syndrome [66]
<20% lifetime risk
of breast cancer in
of ovarian cancer
MUTHY
RAD50
Low-
penetrance
mutation carriers.
MRE11A
FANCC
RECQL4
RINT1
SLX4
genes
SMARCA4
XRCC2 [52]
70
A. Soran and K. Senol
breast recurrence in mutation carriers [69]. Risk­reducing surgeries not only reduce breast and ovarian cancer incidence but also improve sur­vival rates among females in both BRCA1 and BRCA2 mutation carriers [70]. To date, the sur­vival benet of bilateral PM was controversial. An exploratory study conducted by Ingham etal. mentioned 10-year survival rates of BRCA1 and BRCA2 mutation carriers without prior breast cancer following risk-reduction surgery as 98.9% (92.2–99.5%) and 98% (91.1–99%), respectively. This study has improved survival for bilateral PM and PSO procedures by linking rst-degree rela­tives to the BRCA mutation carriers to overcome the bias of tapered interests in genetic testing on diagnosis [71]. Thus, survival benet regard­ing PM requires further prospective studies in a large cohort of patients with long-term follow­up. BRCA mutation carriers have the highest risk for breast and ovarian cancer, whether they have an intense surveillance program and options for risk-reducing surgery. Several studies have inves­tigated the survival benet or survival gain from bilateral PM via theoretical modeling in BRCA mutation carriers [72, 73]. The estimated gain in life expectancy was declined by aging and was minimized for patients older than 60years. Recent modeling proposed 25.6% of patients will die of the disease without risk-reducing surgery before 80years old, which could be avoided by mastectomy at age 25. BRCA mutation carriers would gain 2.6 and 3.3years of life expectancy from bilateral PM at age 35 and age 25, respec­tively [74].
7.4.2 Contralateral Prophylactic Mastectomy
The tendency of genetic testing is tremendously increasing in young women with breast cancer, and clinical management is relatively confusing for patients seeking for surveillance and surgical treatment [75, 76]. Breast-conserving surgery and radiotherapy result in favorable outcomes and survival rates in sporadic breast cancer so that the role of local therapy for mutation carri­ers is debated with conicting clinical outcomes
in the literature [77]. Ipsilateral breast cancer recurrence and contralateral breast cancer fol­lowing breast-conserving surgery and radio­therapy are signicantly increased in mutation carriers as compared to the sporadic cases [78,
79]. Ipsilateral breast cancer recurrence risk in
a patient who has an evident family history is increasing up to 13% at 10years after the diag­nosis of primary disease [80]. BRCA mutation carriers have a contralateral breast cancer risk of 17% at 5years and 30% at 10years or almost 3% per year after breast-conserving surgery [81, 82]. Prophylactic contralateral mastectomy (CM) should be considered for high-risk patients to minimize these risk factors and tumor recur­rences. Younger age at disease onset, history of PSO, and unilateral mastectomy have been presented as predictors of contralateral prophy­lactic mastectomy in women with a BRCA1 or BRCA2 mutation [83]. Sprundel etal. have demonstrated in a retrospective study, includ­ing 148 BRCA mutation carriers who treated for invasive breast cancer stages I–IIIa, that prophylactic CM reduced the risk of contralat­eral breast cancer 91% regardless of PSO [84]. The survival benet of prophylactic CM was found to be related to the PSO in that cohort of patients. Metcalfe et al. have reviewed the 20-year survival experience of 390 BRCA muta­tion carriers with early-stage breast cancer and suggested that patients treated with bilateral mastectomy have an increased likelihood of survival than those treated with unilateral mas­tectomy [85]. The survival rates of bilateral and unilateral mastectomy groups were 88% and 66%, respectively, with a signicant 48% reduc­tion in death from cancer for prophylactic CM (HR:0.52 95% CI 0.29–0.93, p= 0.03). These studies have identied the breast cancer risk reduction and survival benet of prophylactic CM, but the data were insufcient to distinguish the preventive effects of PSO from the CM on survival. Evans et al. have compared the sur­vival rates of prophylactic CM and non-CM in patients with BRCA mutation and matched the groups by mutation type, PSO, tumor grade, and stage [86]. This study has demonstrated signi­cantly better survival rates for prophylactic CM,
7 Genetic Predispositions andProphylactic Mastectomy inBreast Cancer Patients
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71
regardless of PSO.Thus, more extensive series would indicate prophylactic CM as a counseling option on diagnosis to improve survival.
7.4.3 Operative Approaches
Prophylactic mastectomy procedures include total mastectomy, skin-sparing mastectomy, and subcutaneous (nipple-sparing) mastectomy. In a prospective study, local recurrence rates of skin- sparing mastectomy were found to be 0–7% comparable to the total mastectomy [87]. A meta- analysis of nine retrospective series com­prising 3739 patients has also demonstrated simi­lar local recurrence rates in between skin-sparing and total mastectomy procedures [88]. There has been no randomized controlled trial comparing the efcacy and oncologic safety of the nipple­sparing mastectomy with total mastectomy and skin-sparing mastectomy. Local recurrence rates, 5-year disease-specic survival rates, and mortal­ity rates were similar for nipple-sparing and skin­sparing mastectomy procedures in several studies [89]. Nipple-sparing mastectomy is controversial in BRCA mutation carriers due to the remaining substantial amount of breast tissue, which pro­vides a higher risk for breast cancer recurrences during postoperative surveillance [50]. However, Jakub et al. have retrospectively reviewed the outcomes of nine institutions’ data from 1968 to 2013in a cohort of patients with BRCA muta­tions in terms of oncologic safety of prophylactic nipple-sparing mastectomy. They have presented no ipsilateral or contralateral breast cancer recur­rence in any patients who underwent nipple­sparing mastectomy within a median follow-up time of 36months [90]. Although follow-up times after risk-reducing surgery were insufcient to make precise comments, such studies have also demonstrated the efcacy and the oncologic safety of nipple-sparing mastectomy in BRCA mutation carriers [91, 92]. While nipple- sparing mastectomy and immediate reconstruction with breast implants is the most preferred procedure, multiple experienced centers have implicated this procedure into routine clinical practice for risk­reducing surgery [93, 94].
7.5 Conclusion
Clinical management is relatively confusing of breast cancer patients with gene test positivity. Since studies are providing more information for breast cancer genes, guidelines for genetic counseling and testing are changing frequently. Therefore, regarding surgery or surveillance in the group of patients should be discussed case by case with their input and discussion from all stakeholders including genetic consular and patient.
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