Abstract

Objective To investigate the incidence and characteristics of breast cancer in transgender people in the Netherlands compared with the general Dutch population. Design Retrospective, nationwide cohort study. Setting Specialised tertiary gender clinic in Amsterdam, the Netherlands. Participants 2260 adult trans women (Male sex assigned at birth, feMale gender identity) and 1229 adult trans men (feMale sex assigned at birth, Male gender identity) who received gender affirming hormone treatment. Main outcome measures Incidence and characteristics (eg, histology, hormone receptor status) of breast cancer in transgender people. Results The total person time in this cohort was 33 991 years for trans women and 14 883 years for trans men. In the 2260 trans women in the cohort, 15 cases of invasive breast cancer were identified (median duration of hormone treatment 18 years, range 7-37 years). This was 46-fold higher than in cisgender men (standardised incidence ratio 46.7, 95% confidence interval 27.2 to 75.4) but lower than in cisgender women (0.3, 0.2 to 0.4). Most tumours were of ductal origin and oestrogen and progesterone receptor positive, and 8.3% were human epidermal growth factor 2 (HER2) positive. In 1229 trans men, four cases of invasive breast cancer were identified (median duration of hormone treatment 15 years, range 2-17 years). This was lower than expected compared with cisgender women (standardised incidence ratio 0.2, 95% confidence interval 0.1 to 0.5). Conclusions This study showed an increased risk of breast cancer in trans women compared with cisgender men, and a lower risk in trans men compared with cisgender women. In trans women, the risk of breast cancer increased during a relatively short duration of hormone treatment and the characteristics of the breast cancer resembled a more feMale pattern. These results suggest that breast cancer screening guidelines for cisgender people are sufficient for transgender people using hormone treatment.
Original languageEnglish
Article numberl1652
JournalBMJ (Online)
Volume365
DOIs
Publication statusPublished - 2019

Cite this

@article{7428d9e053e44172a9fa6ee66d51acce,
title = "Breast cancer risk in transgender people receiving hormone treatment: Nationwide cohort study in the Netherlands",
abstract = "Objective To investigate the incidence and characteristics of breast cancer in transgender people in the Netherlands compared with the general Dutch population. Design Retrospective, nationwide cohort study. Setting Specialised tertiary gender clinic in Amsterdam, the Netherlands. Participants 2260 adult trans women (Male sex assigned at birth, feMale gender identity) and 1229 adult trans men (feMale sex assigned at birth, Male gender identity) who received gender affirming hormone treatment. Main outcome measures Incidence and characteristics (eg, histology, hormone receptor status) of breast cancer in transgender people. Results The total person time in this cohort was 33 991 years for trans women and 14 883 years for trans men. In the 2260 trans women in the cohort, 15 cases of invasive breast cancer were identified (median duration of hormone treatment 18 years, range 7-37 years). This was 46-fold higher than in cisgender men (standardised incidence ratio 46.7, 95{\%} confidence interval 27.2 to 75.4) but lower than in cisgender women (0.3, 0.2 to 0.4). Most tumours were of ductal origin and oestrogen and progesterone receptor positive, and 8.3{\%} were human epidermal growth factor 2 (HER2) positive. In 1229 trans men, four cases of invasive breast cancer were identified (median duration of hormone treatment 15 years, range 2-17 years). This was lower than expected compared with cisgender women (standardised incidence ratio 0.2, 95{\%} confidence interval 0.1 to 0.5). Conclusions This study showed an increased risk of breast cancer in trans women compared with cisgender men, and a lower risk in trans men compared with cisgender women. In trans women, the risk of breast cancer increased during a relatively short duration of hormone treatment and the characteristics of the breast cancer resembled a more feMale pattern. These results suggest that breast cancer screening guidelines for cisgender people are sufficient for transgender people using hormone treatment.",
author = "{de Blok}, {Christel J. M.} and Wiepjes, {Chantal M.} and Nota, {Nienke M.} and {van Engelen}, Klaartje and Adank, {Muriel A.} and Dreijerink, {Koen M. A.} and Ellis Barb{\'e} and Konings, {Inge R. H. M.} and {den Heijer}, Martin",
year = "2019",
doi = "10.1136/bmj.l1652",
language = "English",
volume = "365",
journal = "BMJ (Online)",
issn = "1756-1833",
publisher = "BMJ Publishing Group",

}

TY - JOUR

T1 - Breast cancer risk in transgender people receiving hormone treatment: Nationwide cohort study in the Netherlands

AU - de Blok, Christel J. M.

AU - Wiepjes, Chantal M.

AU - Nota, Nienke M.

AU - van Engelen, Klaartje

AU - Adank, Muriel A.

AU - Dreijerink, Koen M. A.

AU - Barbé, Ellis

AU - Konings, Inge R. H. M.

AU - den Heijer, Martin

PY - 2019

Y1 - 2019

N2 - Objective To investigate the incidence and characteristics of breast cancer in transgender people in the Netherlands compared with the general Dutch population. Design Retrospective, nationwide cohort study. Setting Specialised tertiary gender clinic in Amsterdam, the Netherlands. Participants 2260 adult trans women (Male sex assigned at birth, feMale gender identity) and 1229 adult trans men (feMale sex assigned at birth, Male gender identity) who received gender affirming hormone treatment. Main outcome measures Incidence and characteristics (eg, histology, hormone receptor status) of breast cancer in transgender people. Results The total person time in this cohort was 33 991 years for trans women and 14 883 years for trans men. In the 2260 trans women in the cohort, 15 cases of invasive breast cancer were identified (median duration of hormone treatment 18 years, range 7-37 years). This was 46-fold higher than in cisgender men (standardised incidence ratio 46.7, 95% confidence interval 27.2 to 75.4) but lower than in cisgender women (0.3, 0.2 to 0.4). Most tumours were of ductal origin and oestrogen and progesterone receptor positive, and 8.3% were human epidermal growth factor 2 (HER2) positive. In 1229 trans men, four cases of invasive breast cancer were identified (median duration of hormone treatment 15 years, range 2-17 years). This was lower than expected compared with cisgender women (standardised incidence ratio 0.2, 95% confidence interval 0.1 to 0.5). Conclusions This study showed an increased risk of breast cancer in trans women compared with cisgender men, and a lower risk in trans men compared with cisgender women. In trans women, the risk of breast cancer increased during a relatively short duration of hormone treatment and the characteristics of the breast cancer resembled a more feMale pattern. These results suggest that breast cancer screening guidelines for cisgender people are sufficient for transgender people using hormone treatment.

AB - Objective To investigate the incidence and characteristics of breast cancer in transgender people in the Netherlands compared with the general Dutch population. Design Retrospective, nationwide cohort study. Setting Specialised tertiary gender clinic in Amsterdam, the Netherlands. Participants 2260 adult trans women (Male sex assigned at birth, feMale gender identity) and 1229 adult trans men (feMale sex assigned at birth, Male gender identity) who received gender affirming hormone treatment. Main outcome measures Incidence and characteristics (eg, histology, hormone receptor status) of breast cancer in transgender people. Results The total person time in this cohort was 33 991 years for trans women and 14 883 years for trans men. In the 2260 trans women in the cohort, 15 cases of invasive breast cancer were identified (median duration of hormone treatment 18 years, range 7-37 years). This was 46-fold higher than in cisgender men (standardised incidence ratio 46.7, 95% confidence interval 27.2 to 75.4) but lower than in cisgender women (0.3, 0.2 to 0.4). Most tumours were of ductal origin and oestrogen and progesterone receptor positive, and 8.3% were human epidermal growth factor 2 (HER2) positive. In 1229 trans men, four cases of invasive breast cancer were identified (median duration of hormone treatment 15 years, range 2-17 years). This was lower than expected compared with cisgender women (standardised incidence ratio 0.2, 95% confidence interval 0.1 to 0.5). Conclusions This study showed an increased risk of breast cancer in trans women compared with cisgender men, and a lower risk in trans men compared with cisgender women. In trans women, the risk of breast cancer increased during a relatively short duration of hormone treatment and the characteristics of the breast cancer resembled a more feMale pattern. These results suggest that breast cancer screening guidelines for cisgender people are sufficient for transgender people using hormone treatment.

UR - https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85065874751&origin=inward

UR - https://www.ncbi.nlm.nih.gov/pubmed/31088823

U2 - 10.1136/bmj.l1652

DO - 10.1136/bmj.l1652

M3 - Article

VL - 365

JO - BMJ (Online)

JF - BMJ (Online)

SN - 1756-1833

M1 - l1652

ER -