The prognostic effects of somatic mutations in ER-positive breast cancer
Obi L Griffith,
Nicholas C. Spies,
Christopher A. Miller,
Benjamin J Ainscough,
Zachary L Skidmore,
Jacqueline E Snider,
Shyam M Kavuri,
Eric C Chang,
David E Larson,
Robert S Fulton,
Mitch Dowsett FMedSci,
Richard K Wilson,
Torsten O Nielsen,
Elaine R. Mardis,
Matthew J. Ellis
Posted 19 Dec 2017
bioRxiv DOI: 10.1101/235846 (published DOI: 10.1038/s41467-018-05914-x)
Posted 19 Dec 2017
More than 50 genes are recurrently affected by somatic mutation in estrogen receptor positive (ER+) breast cancer but prognostic effects have not been definitively established. Primary tumor DNA was therefore subjected to targeted sequencing from 625 postmenopausal (UBC-TAM series) and 328 premenopausal hormonal receptor-positive (HR+) patients (MA12 trial). Independent validation of prognostic interactions were achieved with public data from the METABRIC study. Associations between MAP3K1 and PIK3CA with luminal A status and TP53 mutations with Luminal B/Non-luminal tumors were observed, validating the methodological approach. In UBC-TAM, NF1 frame-shift nonsense (FS/NS) mutations were validated as poor outcome drivers. For MA12, poor outcomes associated with PIK3R1 mutation were similarly validated. DDR1 mutations were strongly associated with poor prognosis in UBC-TAM with false-discovery correction (q=0.0003). In conclusion, the tail of uncommon recurrent somatic mutations should be further explored to create a more complete explanation of the highly variable outcomes that typify ER+ breast cancer.
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