ETV6-NTRK3 Gene fusion positive Secretory carcinoma Breast in a two year
seven month old child with metastatic axillary lymph node: A case report
and Review of literature
Abstract
Abstract Secretory breast carcinoma (SBC) is an exceptionally rare type
of breast carcinoma accounting for less than 0.15% of all breast
cancers6and with varied presentations. There is a lack of consensus
regarding the exact management and there is evolving role of targeted
therapy with successful treatment outcomes. We present a case of SBC in
a two year seven month old child with axillary lymph node(ALN)
metastasis, oestrogen receptor(ER) positivity and the characteristic
ETV6-NTRK3 fusion gene expression. She was managed by surgery followed
by use of tamoxifen and targeted agent Larotrectinib. Chemoradiotherapy
was avoided considering the age and doubtful benefit. We also summarise
the pattern of presentation in SBC, treatment options and follow up
which would aid in making treatment decisions in clinical practice.
Keywords: Breast, Secretory carcinoma, ETV6-NTRK3 fusion, Larotrectinib