Interestingly, a PRLR gain-of-function mutant resulting in increased STAT5 signaling is associated with the presence of multiple benign breast fibroadenomas [ 89].
Concordance of the Gail and Claus models has been shown to be relatively poor, with the greatest discrepancies seen with nulliparity, multiple benign breast biopsies, and a strong paternal or first-degree family history [ 37, 38].
From 21 to 26 years old, I endured multiple biopsies and lumpectomies to remove benign breast cysts, but my doctors told me not to worry because, "Girls your age don't get breast cancer".
Invasive ductal breast tumours are thought to arise from benign breast tissues through multiple transforming events over time (Wellings and Jensen, 1973; Wellings et al, 1975; Jensen et al, 1976; Allred and Mohsin, 2000).
Overall, XEs, when tested in benign breast cells from multiple human subjects, consistently initiated specific functional changes of the kind that are attributed to malignant onset in breast tissue.
We controlled for the influence of potential breast cancer risk factors including age at diagnosis of breast cancer, alcohol consumption, BMI, first-degree family history of breast cancer, geographic location (state where breast cancer diagnosis was made), and history of benign breast disease using multiple variable logistic regression.
These syndromes, which are associated with the formation of multiple benign tumours (harmartomas) and increased rates of malignant breast and thyroid tumours, reveal that even minor disruption of PTEN function can increase the risk of cancer [ 3].
These benign breast lesions are composed of minute multiple cysts lined by uniform flat or cuboidal to columnar epithelium.
Cowden's disease or multiple hamartoma syndrome showed an increased risk for both benign breast disorders like fibroadenomas and nipple malformations and breast malignancies [ 23, 24].
An alternative explanation may be that there are multiple pathways to breast cancer and pathways involving proliferative benign breast lesions may not be influenced by alcohol consumption.
Studies have confirmed correlation of PEG3 methylation between multiple tissue types, including blood and normal breast tissue [ 38] and that cancerous breast tumours have increased methylation compared to benign breast tumours [ 39].
