Breast cancer in a transgender man and hypofractionated radiotherapy: A case report and review of literature

A 77-year-old transgender man (assigned female sex at birth, gender identity male, i.e. female-to-male) was referred for a palpable mass of the right chest wall. Biopsies revealed invasive lobular breast carcinoma. After discussion by a multidisciplinary tumour board meeting, the patient was treated with total mastectomy, adjuvant hypofractionated radiation therapy, and hormone therapy. At 1.5-year follow-up, there was no sign of recurrence or long-term radiation side effects. To our knowledge, this is the first reported case of adjuvant hypofractionated radiation therapy in a transgender patient with breast cancer.

Systematic Review on Gender-Affirming Testosterone Therapy and the Risk of Breast Cancer: A Challenge for Physicians Treating Patients from Transgender and Gender-Diverse Populations

Conflicting evidence exists about the risk of breast cancer in transgender and gender-diverse (TGD) patients treated with testosterone. This review aimed to summarize current knowledge regarding the risk of breast cancer associated with gender-affirming testosterone treatment (GATT). A systematic literature search using the Preferred Reporting Items for Systematic Review and Meta-Analysis checklist was conducted in January 2023 through Ovid, Scopus, and Web of Science databases. English-language, peer-reviewed articles evaluating breast cancer in TGD patients after GATT that met the inclusion criteria were included. This review included 22 articles, with 14 case reports, 4 case series, and 4 retrospective cohort studies. The review identified 26 TGD patients who developed breast cancer post-GATT therapy, with inconclusive evidence on the relationship between testosterone and the risk of breast cancer in TGD patients. This uncertainty in part arises from the mechanisms governing testosterone's effects within breast tissue, with contrasting theories proposing both proliferative and antiproliferative impacts. Considering this ambiguity, it is imperative for healthcare providers to engage in informed discussions with patients prior to initiating hormone therapy to discuss potential adverse effects, including the possibility of breast cancer development in TGD individuals. Patient education and shared decision-making are essential components of responsible care in this context.

Breast Cancer Screening Referral Patterns and Compliance in Transgender Male Patients

Purpose

Screening guidelines for breast cancer (BC) in transgender male (TM) patients are not well defined. This study describes referral patterns and compliance with referral for BC screening among TM patients receiving care at a tertiary care center.

Methods

This was a retrospective cohort study of TM patients, 40-74 years of age, presenting for care between 2017 and 2020. The electronic medical record was queried for medical history and cancer screening data. Compliance with referral and screening was defined as occurring within 2 years of when screening would be expected.

Results

Of the 266 patients identified, 45 met inclusion criteria. One (2.2%) had a history of BC, 0 (0%) had hereditary BC risk, and 11 (24.4%) had a family history of BC. Of the patients, 18 (40%) were referred for BC screening, of whom 13 (72.2%) were compliant with screening. Ten (55.6%) were referred by a primary care provider, 2 (11.1%) were referred by a transgender medicine specialist, and 6 (33.3%) were referred by both. Of the cohort, 27 (60%) had undergone masculinizing mastectomy. Six (22.2%) of these patients were referred for screening, of whom 0 (0%) had pre-screening clinical findings indicating need for screening. Of the 18 (40%) patients who had not undergone masculinizing mastectomy, 12 (66.7%) were referred for BC screening.

Conclusions

There was heterogeneity in referral patterns for BC screening between TM patients who had undergone masculinizing mastectomy and those who had not. BC screening guidelines should be established for TM patients who have undergone masculinizing mastectomy.

Aspects to consider regarding breast cancer risk in trans men: A systematic review and risk management approach

BACKGROUND

The risk of breast cancer in trans men is currently a poorly understood subject and trans men likely carries a different level of risk from that of cis women.

AIM

This review aims to review several aspects that affects breast cancer risk in trans men and to apply the Swiss cheese model to highlight these risks. The study takes its cue from a systematic review of all described breast cancer cases in trans men following medical or surgical intervention because of gender dysphoria.

METHODS

PubMed was systematically searched on the 14th of March 2023 to find all published cases of breast cancer following chest contouring surgery in trans men. Included articles had to involve trans men, the diagnosis of breast cancer had to be preceded by either a medical or surgical intervention related to gender dysphoria, and cases needed to involve invasive breast cancer or ductal carcinoma in situ. Articles were excluded if gender identity in the case subject was unclear and/or a full English version of the report was unavailable. Quality and risk of bias was evaluated using the GRADE protocol. A literature review of specific risk altering aspects in this population followed. The Swiss cheese model was employed to present a risk analysis and to propose ways of managing this risk.

RESULTS

28 cases of breast cancer in trans men have been published. The Swiss cheese model identified several weaknesses associated with methods of preventing breast cancer in trans men.

CLINICAL IMPLICATIONS

This study may highlight the difficulties with managing risk factors concerning breast cancer in trans men to clinicians not encountering this patient group frequently.

CONCLUSION

This review finds that evidence for most aspects concerning breast cancer in trans men are inadequate, which supports the establishment of a risk-management approach to breast cancer in trans men.

Breast cancer and gender-affirming hormone therapy for transgender and gender-diverse (TGD) individuals

Transgender and gender-diverse (TGD) individuals are at risk for breast cancer, but are less likely to undergo screening mammograms and appear to suffer poorer cancer-related outcomes than cisgender women. Gender-affirming hormone therapy (GAHT) may be lifesaving for TGD individuals from the perspective of affirming their core identities; however, the effects of GAHT on cancer development, progression, and outcomes are poorly understood.

Clinicopathological Significance and Expression Pattern of Bcl2 in Breast Cancer: A Comprehensive in silico and in vitro Study

B-cell lymphoma/leukemia gene-2 (Bcl-2) is the primary proto-oncogene that has been shown to work by preventing apoptosis/programmed cell death. Bcl-2 combines a variety of cell-generated signals associated to the survival and death of cells. In glioma, lung, and breast cancer, Bcl-2 over-expression has been linked to an increase in invasion and migration. Many treatment regimens that target Bcl2 have been established and approved, and thus increasing the survival rates of the patients. The primary goal of this research was to recognize new therapeutic compounds that target Bcl2 and assess Bcl2 expression pattern in BC patients. We used various bioinformatic tools as well as several in vitro assays to look out the expression and inhibition of Bcl2 in BC. Our study depicted that Bcl2 had a strong connection with tumour stroma, notably with suppressor cells originating from myeloid tissues. Moreover, in vitro and in silico research identified Paclitaxel as a promising natural substance that targets Bcl2. Overall, this work shows that Bcl2 overexpression accelerates the development of BC, and that targeting Bcl2 in combination with other drugs will dramatically improve BC patient's response to treatment and prevent the emergence of drug resistance.

Complexities in Adjuvant Endocrine Therapy for Breast Cancer in Female-to-Male Transgender Patients

Introduction

Managing breast cancer in female-to-male (FtM) transgender patients is complicated and challenging. Androgens play a crucial role in the development of secondary sexual identity in FtM transgender patients, but their effectiveness in breast cancer remains unclear. Furthermore, the considerations for adjuvant endocrine therapy in this population are highly intricate and warrant thorough discussion.

Case Presentation

We describe the case of a 44-year-old FtM transgender diagnosed with breast cancer 3 years after initiating androgen receptor agonist therapy as part of his gender identity transition. After mastectomy, adjuvant endocrine therapy was initiated, consisting of a combination of an aromatase inhibitor and a gonadotropin-releasing hormone agonist, along with a cross-sex hormone.

Conclusion

Estradiol levels were significantly reduced, and male-typical levels of sex hormones were attained.

Cancer screening and management in the transgender population: Review of literature and special considerations for gender affirmation surgery

BACKGROUND

Literature focused on cancer screening and management is lacking in the transgender population.

AIM

To action to increase contributions to the scientific literature that drives the creation of cancer screening and management protocols for transgender and gender nonconforming (TGNC) patients.

METHODS

We performed a systematic search of PubMed on January 5th, 2022, with the following terms: "TGNC", OR "transgender", OR "gender non-conforming", OR "gender nonbinary" AND "cancer screening", AND "breast cancer", AND "cervical cancer", AND "uterine cancer", AND "ovarian cancer", AND "prostate cancer", AND "testicular cancer", AND "surveillance", AND "follow-up", AND "management". 70 unique publications were used. The findings are discussed under "Screening" and "Management" categories.

RESULTS

Screening: Current cancer screening recommendations default to cis-gender protocols. However, long-term gender-affirming hormone therapy and loss to follow-up from the gender-specific specialties contribute to a higher risk for cancer development and possible delayed detection. The only known screening guidelines made specifically for this population are from the American College of Radiology for breast cancer. Management: Prior to undergoing Gender Affirmation Surgery (GAS), discussion should address cancer screening and management in the organs remaining in situ. Cancer treatment in this population requires consideration for chemotherapy, radiation, surgery and/or reconstruction. Modification of hormone therapy is decided on a case-by-case basis. The use of prophylactic vs aesthetic techniques in surgery is still debated.

CONCLUSION

When assessing transgender individuals for GAS, a discussion on the future oncologic risk of the sex-specific organs remaining in situ is essential. Cancer management in this population requires a multidisciplinary approach while the care should be highly individualized with considerations to social, medical, surgical and gender affirming surgery related specifications. Special considerations have to be made during planning for GAS as surgery will alter the anatomy and may render the organ difficult to sample for screening purposes. A discussion with the patient regarding the oncologic risk of remaining organs is imperative prior to GAS. Other special considerations to screening such as the conscious or unconscious will to unassociated with their remaining organs is also a key point to address. We currently lack high quality studies pertinent to the cancer topic in the gender affirmation literature. Further research is required to ensure more comprehensive and individualized care for this population.

Risk and incidence of breast cancer in transgender individuals: a systematic review and meta-analysis

BACKGROUND AND AIMS

The risk of developing breast cancer in transgender individuals [male-to-female (MtF) or female-to-male (FtM)] is still inadequately quantified. We aimed to evaluate the impact of breast cancer in this population.

METHODS

We conducted a systematic literature search and review using the Preferred Reporting Items for Systematic reviews and Meta-Analyses guidelines through the PUBMED and SCOPUS databases. We identified six cohort studies (for both populations) plus 35 case reports. Incidence and breast cancer risk quantification were the main outcomes considered.

RESULTS

FtM individuals had a higher risk of developing breast cancer in comparison to cisgender men [standardized incidence ratio (SIR) = 63.4; 95% confidence interval (CI), 32.2-124.9] but a lower risk than cisgender women (SIR = 0.42; 95% CI, 0.07-2.41). Similarly, MtF individuals were at higher risk of developing breast cancer in comparison to cisgender men (SIR = 22.5; 95% CI, 5.54-91.8) and at lower risk than cisgender women (SIR = 0.30; 95% CI, 0.22-0.42).

CONCLUSION

In this systematic study and meta-analysis, we identified that FtM and MtF individuals are at substantially higher risk of developing breast cancer in comparison to cisgender men, though at lower risk than cisgender women. These individuals, in the absence of defined guidelines for breast cancer prevention, should periodically undergo breast or chest examinations.

The Impact of Exogenous Testosterone on Breast Cancer Risk in Transmasculine Individuals

BACKGROUND

Exogenous testosterone is vital to gender-affirming therapy for transmasculine individuals. Testosterone may be implicated in breast cancer (BCa) because it can activate androgen and estrogen receptors. To further explore this risk, we performed a systematic review to investigate the impact of exogenous testosterone on BCa risk in transmasculine individuals.

METHODS

We searched PubMed/MEDLINE and Ovid/Embase for clinical and preclinical studies assessing BCa and testosterone therapy and screened 6125 articles independently. We ascertained level of evidence using a modified tool from Cook et al (Chest. 1992;102:305S-311S) and risk of bias using a modified Joanna Briggs Institute's Critical Appraisal Tool.

RESULTS

Seventy-six studies were included. Epidemiological data suggested that BCa incidence was higher in transmasculine individuals compared with cisgender men but lower compared with cisgender women. Histological studies of transmasculine breast tissue samples also demonstrated a low incidence of precancerous lesions. Interestingly, cases demonstrated that BCa occurred at a younger average age in transmasculine individuals and was predominantly hormone receptor positive. The mechanism for BCa in transmasculine individuals may be related to androgen receptor stimulation or conversion to estradiol. Serum studies reported varied estradiol levels associated with exogenous testosterone. Animal and in vitro studies demonstrated that testosterone was growth inhibitory but may induce proliferation at higher doses or with low estradiol levels.

CONCLUSIONS

Plastic surgeons play a critical role in providing gender-affirming care for transmasculine patients. The limited studies available suggest that this patient population has decreased risk for BCa when compared with cisgender women; however, any BCa that does occur may have different clinical presentations and underlying mechanisms compared with cisgender women and men. Overall, the limitations for clinical studies and discrepancies among preclinical studies warrant further investigation.

Invasive Ductal Carcinoma of the Breast in a Transgender Man: A Case Report

There is limited literature about breast cancer in the transgender population. Very little is known about how gender-affirming hormone therapy affects their breast cancer risk. On the other end, for those diagnosed with breast cancer, there are no clinical guidelines to manage their breast cancer, specifically, how to manage their gender-affirming hormone therapy during breast cancer treatment. Here, we report a 52-year-old transman diagnosed with a grade 2 invasive ductal carcinoma (ER+/PR+/HER2-), and ductal carcinoma in situ (DCIS) of intermediate grade. We discussed his risk factors as well as treatment options.

Transgender Mastectomy: Incidence of High-Risk Pathologic Findings and the Need for Postoperative Cancer Surveillance

BACKGROUND

Chest masculinization surgeries are one of the most common gender-affirming procedures performed. There is a need for better understanding of the risk of breast cancer and postsurgical screening in female to male (FtM) individuals. This study aimed to evaluate the incidence of high-risk pathologic findings in FtM transgender patients undergoing gender-affirming chest reconstructive surgery.

METHODS

Medical records were reviewed from all FtM patients undergoing gender-affirming chest reconstructive surgery from January 2010 to February 2021 by 3 plastic surgeons at the University of Pittsburgh Medical Center. Relative risk of malignant progression was used to stratify pathologic data. Subsequent management of atypical, in situ, and invasive pathology were recorded.

RESULTS

A total of 318 patients were included in this study; the average age at surgery was 24.6 ± 8.1 years. Eighty-six patients (27%) had a family history of breast and/or ovarian cancer. Overall, 21 patients (6.6%) had some increased risk of breast cancer: 17 (5.3%) had proliferative lesions, mean age 38.2 ± 12.4 years; 2 had atypical ductal hyperplasia, ages 33.4 and 38.3 years; and 2 had invasive ductal carcinoma, ages 35.4 and 40.6 years.

CONCLUSIONS

In this study, we found that 6.6% of FtM transgender patients undergoing top surgery had an elevated risk of breast cancer, with 1.2% of patients having a greater than 2 times risk of breast cancer. These results highlight the importance of appropriate preoperative screening as well as pathological analysis of surgical specimens to help guide clinical care. The authors advocate for a thorough breast cancer risk assessment before surgery for all patients, as well as using pathologic findings to guide postoperative cancer screening and follow-up.

The Incidence of Breast Cancer After Gender-Affirming Mastectomy in Transmen

BACKGROUND

The incidence of breast cancer in transmale patients and their continued risk after gender-affirming mastectomy (GAM) has not been well established. Plastic surgeons who offer GAM are often one of the few medical professionals sought out by this population, placing them in a unique position to not only deliver surgical care but also improve access to preventative cancer care.

METHODS

We reviewed the senior author's experience with GAMs over the past 5 years for any incidence of breast cancer noted after or at time of surgery. We subsequently performed a thorough review of the literature for cases of breast cancer in transmen, to provide a comprehensive overview of screening, therapy, and postoperative surveillance practices.

RESULTS

We identified 2 cases of breast cancer (ages 49 and 54 years) found on routine examination of pathology specimens after GAM at our institution. Both patients had been taking hormone therapy for the past 1 year. Pathology specimen revealed low-grade estrogen receptor-/progesterone receptor-positive ductal carcinoma in situ in 1 patient, and estrogen receptor-/progesterone receptor-positive invasive ductal carcinoma in the other. Both patients were referred to oncology for appropriate treatment, and both elected to continue their exogenous hormone therapy for personal reasons.Review of the literature demonstrated 36 other cases of documented breast cancer in transmen. Sixty-seven percent (24) were found after GAM, and of those, 50% were incidentally found on pathology specimen. At least 50% were found to be either estrogen-, progesterone-, or androgen receptor-positive cancers. At least 17% of cases documented continued use of masculinizing hormone therapy after cancer diagnosis.

CONCLUSIONS

Most documented cases of breast cancer in transmen were diagnosed after gender-affirming surgery, which would suggest residual breast tissue does pose some risk for breast cancer. In addition, those diagnosed with cancer may elect to continue exogenous testosterone therapy despite potential added risks with hormone-receptor positivity. These cases highlight the need for agreement in current screening practices, surgical recommendations, and continuation of masculinizing hormone therapy.Plastic surgeons have the unique opportunity to educate these patients on appropriate breast cancer-related surveillance both before and after chest surgery.

The Other Side of the Coin: May Androgens Have a Role in Breast Cancer Risk?

Breast cancer prevention is a major challenge worldwide. During the last few years, efforts have been made to identify molecular breast tissue factors that could be linked to an increased risk of developing the disease in healthy women. In this concern, steroid hormones and their receptors are key players since they are deeply involved in the growth, development and lifetime changes of the mammary gland and play a crucial role in breast cancer development and progression. In particular, androgens, by binding their own receptor, seem to exert a dichotomous effect, as they reduce cell proliferation in estrogen receptor α positive (ERα+) breast cancers while promoting tumour growth in the ERα negative ones. Despite this intricate role in cancer, very little is known about the impact of androgen receptor (AR)-mediated signalling on normal breast tissue and its correlation to breast cancer risk factors. Through an accurate collection of experimental and epidemiological studies, this review aims to elucidate whether androgens might influence the susceptibility for breast cancer. Moreover, the possibility to exploit the AR as a useful marker to predict the disease will be also evaluated.

Histologic Findings in Surgical Pathology Specimens From Individuals Taking Masculinizing Hormone Therapy for the Purpose of Gender Transition: A Systematic Scoping Review

CONTEXT.—

Transgender men and transmasculine persons experience a discordance between the female sex they were assigned at birth and their gender. They may choose to take hormone therapy and/or undergo surgery to masculinize the body. Understanding the common (and less common) histologic changes present in patients taking masculinizing hormones will empower pathologists to better serve this unique patient population.

OBJECTIVE.—

To summarize histologic findings in surgical pathology specimens from persons taking masculinizing hormones as a part of gender transition.

DATA SOURCES.—

A systematic review of the OVID Medline and PubMed databases was performed to identify all studies describing histologic findings in surgical pathology specimens from transgender men from January 1946 to January 2021.

CONCLUSIONS.—

Publication in this area has markedly increased in the last 2 decades. However, most of the studies identified were descriptive and case reports describing changes seen in specimens removed as a part of masculinizing surgical procedures. Benign histologic findings include stromal hyalinization and epithelial atrophy in the breast, polycystic ovarian syndrome-like changes in the ovary, and transitional cell metaplasia in the cervix. The most commonly reported neoplastic finding was adenocarcinoma of the breast, with rare cases of ovarian, endometrial, cervical, vaginal, pituitary, pancreatic, and cardiovascular neoplasia also reported. Ongoing research in this area is needed to better characterize the histologic findings in persons taking masculinizing hormones to provide a deeper understanding of the effect of these treatments on different tissues and facilitate better patient management.

Oncologic Considerations for Safe Gender-Affirming Mastectomy: Preoperative Imaging, Pathologic Evaluation, Counseling, and Long-Term Screening

SUMMARY

There remain significant gaps in the evidence-based care of patients undergoing gender-affirming mastectomy with regard to implications for breast cancer development and screening. The current clinical evidence does not demonstrate an increased risk of breast cancer secondary to testosterone therapy in transgender patients. Gender-affirmation mastectomy techniques vary significantly with regard to the amount of residual breast tissue left behind, which has unknown implications for the incidence of postoperative breast cancer and need for screening. Subcutaneous mastectomy should aim to remove all gross breast parenchyma, although this is limited in certain techniques. Tissue specimens should also be routinely sent for pathologic analysis. Several cases of incidental breast cancer after subcutaneous mastectomy have been described. There is little evidence on the need for or types of postoperative cancer screening. Chest awareness is an important concept for patients that have undergone subcutaneous mastectomies, as clinical examination remains the most common reported method of postmastectomy malignancy detection. In patients with greater known retained breast tissue, such as those with circumareolar or pedicled techniques, consideration may be given to alternative imaging modalities, although the efficacy and cost-utility of these techniques must still be proven. Preoperative patient counseling on the risk of breast cancer after gender-affirming mastectomy in addition to the unknown implications of residual breast tissue and long-term androgen exposure is critical. Patient awareness and education play an important role in shared decision-making, as further research is needed to define standards of medical and oncologic care in this population.

Implications for management of ovarian cancer in a transgender man: Impact of androgens and androgen receptor status

A 36-year-old transgender man (assigned female at birth) on exogenous testosterone therapy was found to have stage IIA ovarian endometrioid carcinoma, and underwent adjuvant chemotherapy. Diffuse androgen receptor expression in the tumor initiated a multidisciplinary discussion regarding the safety of continuing exogenous testosterone as gender-affirming hormone therapy.

Testosterone therapy and breast histopathological features in transgender individuals

Testosterone therapy (TT) is administered to enhance masculinization in transgender individuals. The long-term effect of exogenous testosterone on breast tissues remains unclear. Our study evaluated the modulation of breast morphology by TT in transgender individuals with special attention to duration of TT. We reviewed 447 breast surgical specimens from gender affirming chest-contouring surgery, and compared histopathological findings including degree of lobular atrophy, and atypical and non-atypical proliferations between subjects who did (n = 367) and did not (n = 79) receive TT. TT for one patient was unknown. TT for >12 months was associated with seven histopathological features. Longer duration of TT was significantly associated with higher degrees of lobular atrophy (p < 0.001). This relationship remained significant after accounting for age at surgery, ethnicity, body mass index, and presurgical oophorectomy (adjusted p < 0.001). Four types of lesions were more likely to be absent in breast tissues exposed to longer durations of TT: cysts (median = 16.2 months; p < 0.01; adjusted p = 0.01), fibroadenoma (median = 14.8 months; p = 0.02; adjusted p = 0.07), pseudoangiomatous stromal hyperplasia (median = 17.0 months; p < 0.001; adjusted p < 0.001), and papillomas (median = 14.7 months; p = 0.04; adjusted p = 0.20). Columnar cell change and mild inflammation were also less likely to occur in subjects receiving TT (p < 0.05), but were not linked to the duration of TT. Atypia and ductal carcinoma in situ were detected in 11 subjects (2.5%) all of whom received TT ranging from 10.1 to 64.1 months. The incidental findings of high-risk lesions and carcinoma as well as the risk of cancer in residual breast tissue after chest-contouring surgery warrant the consideration of culturally sensitive routine breast cancer screening protocols for transgender men and masculine-centered gender nonconforming individuals. Long-term follow-up studies and molecular investigations are needed to understand the breast cancer risk of transgender individuals who receive TT.

Medical transition for gender diverse patients

Purpose of review

The purpose of this review is to provide an up-to-date overview of gender-affirming hormone therapy, including the various hormone regimens available, the efficacy and potential risks of these treatments, and considerations for surveillance and long-term care.

Recent findings

Recent studies reaffirm that hormone therapy has positive physical and psychological effects for many transgender individuals. The overall risks of treatment are low. Transgender women may have an increased risk of venous thromboembolism and breast cancer based on recent cohort studies, but these findings have yet to be confirmed with randomized controlled trials. Important long-term considerations include metabolic, cardiovascular, and skeletal health.

Summary

High-quality, long-term studies on the effectiveness and safety of various gender-affirming hormone treatment regimens are lacking, but the currently available evidence suggests that it is overall safe and effective with appropriate oversight.

Breast malignancy in female-to-male transsexuals: systematic review, case report, and recommendations for screening

BACKGROUND

Female-to-male (FtM) transsexuals may use testosterone therapy for masculinization, which potentially influences the risk of breast cancer development. Guided by our case report, we aimed to investigate the evidence regarding the risk of testosterone therapy on breast malignancy in female-to-male transsexuals and evaluate breast cancer screening in this subgroup.

METHODS

We conducted a systematic literature search according to the PRISMA checklist in June 2020 in PubMed/MEDLINE and Ovid/EMBASE. Reference lists of included articles were screened to find additional articles that met the inclusion criteria. All cohort studies and case reports evaluating breast cancer in FtM transsexuals after testosterone therapy were included.

RESULTS

We found 23 cases of FtM transsexuals who developed breast cancer after testosterone therapy, including our own case. Moreover, we evaluated ten retrospective cohort studies investigating breast malignancy in the transsexual population. The cohort studies showed no elevated risk in FtM transsexuals compared to natal women. Including our own case, nine cases were described in which breast malignancy was incidentally found during routine histological examination after mastectomy. High-level evidence for a correlation between testosterone therapy and breast malignancy is missing.

CONCLUSION

Few cases are described of FtM transsexuals with breast malignancy. However, cases such as these make physicians aware of the possibility of breast cancer in FtM transsexuals. Radiological screening of FtM transsexuals for breast cancer prior to mastectomy and histological screening of the mammalian tissue after mastectomy should be considered; physicians should decide together with every individual FtM transsexual if screening is necessary.