The stem cell renewal and DNA damage response pathways are frequently altered in fibroepithelial tumors of breast in Indian patients

Pathology, Research and Practice
Nupur MukherjeeChinmay Kumar Panda

Abstract

Genetic and epigenetic alterations in genes associated with distinct cellular pathways were checked in fibroepithelial tumors, including fibroadenomas, benign and malignant phyllode and atypical ductal hyperplasia. A panel of 22 genes associated with different cellular pathways such as stem cell renewal (Wnt and Hedgehog), DNA damage response [homologous recombination (HR), mismatch repair (MMR) and nucleotide excision repair (NER)] and cell proliferation signaling pathway were tested. Alterations (genetic/epigenetic) of the genes associated with Wnt signaling pathway were detected in 100% (20/20) of the breast tumors for at least one out of the six Wnt antagonists tested. Frequent molecular alterations (57-64%) were detected in HR and MMR pathway and low frequency of alterations (8-25%) were seen in cell-proliferation and cell signaling pathways showing a differential pattern of alterations in different tumor types. The patterns of alterations, in particular the epigenetic alterations, differed little from that seen previously in breast carcinoma cells, suggesting epigenetic alterations to be an early event in the development of the tumors. In gene ontology analysis, it was evident that Wnt signaling pathway [GO: 0030111, Kegg...Continue Reading

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Citations

Jul 20, 2017·International Journal of Cancer. Journal International Du Cancer·Pritish NilenduNilesh Kumar Sharma
May 18, 2020·Clinical Breast Cancer·Nupur Mukherjee, Chinmay Kumar Panda

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