Abstract
Purpose
Gigantomastia refers to pathological breast enlargement usually occurring in the peripubertal or peripartum period. Idiopathic gigantomastia, however, is a rare entity with hypotheses citing local expression of hormones and growth factors in causing this disease, none of which have been systemically analysed. The purpose of this study was to delve deeper into the mechanistic pathways causing this condition.
Methods
Herein, we describe three patients of idiopathic gigantomastia, all of whom had had normal puberty and uneventful pregnancies. Further, one of the patients had postmenopausal gigantomastia which is extremely rare, with only four cases described in the literature. Serum markers of autoimmunity, incriminated hormones and growth factors analysed, were normal in all the cases. Breast tissue specimens were subjected to histopathological examination and immunohistochemistry for ER, PR and Her-2-Neu. Quantitative immunofluorescence for aromatase, IGF2, EGFR, TGF-β, PDGFR-α, β, IGF1 and PTHrP was also performed.
Results
Of these, the tissue expression of aromatase, IGF2, EGFR, TGF-β, PDGFR-α and β were found to be upregulated, whereas IGF1 and PTHrP were comparable to normal breast.
Conclusion
This observation that paracrine overexpression of these factors is responsible for the pathogenesis of apparently idiopathic gigantomastia may have therapeutic ramifications in the future for patients with this debilitating condition.
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Abbreviations
- PTHrP:
-
Parathyroid hormone related peptide
- BMI:
-
Body mass index
- E2:
-
Estradiol
- LH:
-
Luteinising hormone
- FSH:
-
Follicle stimulating hormone
- IGF1:
-
Insulin like growth factor-1
- IGF2:
-
Insulin like growth factor-2
- GH:
-
Growth hormone
- fT3:
-
Free Tri-iodo thyronine
- fT4:
-
Free Tetra-iodo thyronine
- TSH:
-
Thyroid stimulating hormone
- HbA1c:
-
Glycated hemoglobin
- HOMA-IR:
-
Homeostasis model assessment for insulin resistance
- BIRADS:
-
Breast imaging reporting and data system
- TPO:
-
Thyroid peroxidase
- ANA:
-
Anti-nuclear antibodies
- SMA:
-
Anti-smooth muscle antigen
- LKM:
-
Anti-liver kidney muscle antibody
- AMA:
-
Anti-mitochondrial antibody
- CEA:
-
Carcinoembryonic antigen
- α-FP:
-
Alpha fetoprotein
- NAC:
-
Nipple areola complex
- IHC:
-
Immunohistochemistry
- ER:
-
Estrogen receptor
- PR:
-
Progesterone receptor
- Her-2-Neu:
-
Herceptin
- IF:
-
Immunofluorescence
- PDGFR-α:
-
Platelet derived growth factor-alpha
- PDGFR-β:
-
Platelet derived growth factor-beta
- VEGF:
-
Vascular endothelial growth factor
- TGF-β:
-
Transforming growth factor-beta
- IG:
-
Idiopathic gigantomastia
- 17-β E2:
-
7.6–42.6 pg/ml
- Progesterone:
-
<1 ng/ml
- LH:
-
2.4–12.6 mIU/ml
- FSH:
-
3.5–12.5 mIU/ml
- GH:
-
<1 ng/ml
- Prolactin:
-
5–25 ng/ml
- fT3:
-
2.3–4.2 pg/ml
- T4:
-
0.89–1.76 ng/dl
- TSH:
-
0.4-4.2 mIU/l
- TPO:
-
<34 IU/ml
- HbA1c:
-
<5.7%
- CA125:
-
0–35
- CA19-9:
-
0–27
- CEA:
-
3.8–5.5
- α-FP:
-
0–5.8
- IGF1:
-
64–262 ng/ml
- HOMA-IR:
-
<2—normal, 2 to 3—mild insulin resistance, 3 to 5—moderate insulin resistance, >5—severe insulin resistance
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Acknowledgements
We would like to thank Prof. Ashley Grossman for his constructive comments.
Author contribution
L.D. drafted the manuscript and interpreted observations. A.R. was involved in histopathology interpretation and manuscript writing. K.V. was involved in histopathology interpretation and manuscript editing. A.G. assisted surgery of the first case. S.M. assisted surgery of the first case. A.B. edited the manuscript. P.D. conceived the idea and was involved in manuscript writing as well as editing. S.S.T. operated the case and was involved in manuscript editing.
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Das, L., Rai, A., Vaiphei, K. et al. Idiopathic gigantomastia: newer mechanistic insights implicating the paracrine milieu. Endocrine 66, 166–177 (2019). https://doi.org/10.1007/s12020-019-02065-x
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DOI: https://doi.org/10.1007/s12020-019-02065-x