Abstract P1-02-02: ESR1 mutations in circulating tumor cell versus circulating cell-free DNA of metastatic breast cancer patients before first-line endocrine therapy and at progression
Abstract:Background
Mutations in ESR1, the gene encoding the estrogen receptor, have been linked to endocrine resistance in metastatic breast cancer (MBC). It is thought that these mutations are selected during endocrine treatment (ET), but direct evidence that these ESR1 mutations (mESR1) emerge during treatment with endocrine agents is scant. We set out to evaluate mESR1 in circulating tumor cells (CTCs) and matched plasma cell-free DNA (cfDNA) of MBC patients before start of 1st line ET and at progres… Show more
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