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Abstract | Full HTML Article | PDF ecancer 14 1002 / https://doi.org/10.3332/ecancer.2020.1002

Case Report

VUS-type alteration in POLD1 and microsatellite instability in a metastatic luminal B breast cancer patient

Microsatellite instability (MSI) and POLD1 mutations are usually described in colorectal tumours in patients with polyposis syndrome but rarely found in breast tumours. This case describes a metastatic luminal B breast tumour in a young patient with an important family history of cancer. Mutational studies found a Variant of Uncertain Significance (VUS)-type alteration in POLD1 that motivated the study for MSI, which was found positive. Recent data point towards the use of pembrolizumab as a treatment option for tumour presenting with MSI instead of chemotherapy.

Keywords: POLD1, luminal B breast cancer, pembrolizumab, microsatellite instability

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Founding partners

European Cancer Organisation European Institute of Oncology

Founding Charities

Foundazione Umberto Veronesi Fondazione IEO Swiss Bridge

Published by

ecancer Global Foundation