BRCA1 promoter methylation was measured using methylation-specific multiplex ligation-dependent probe amplification (MS-MLPA; MRC Holland, Amsterdam, the Netherlands) according to manufacturer’s instructions. Two of the xenografts generated in CRUK/UCAM (STG139 and STG201) had been previously tested using reduced-representation bisulfite sequencing (RRBS)(16) and further validated using MS-MLPA. Positive controls of BRCA1 promoter hypermethylation were used (T127 and/162).(24)
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