APOBEC3A is a prominent cytidine deaminase in breast cancer.

Comparison of A3A and A3B expression to APOBEC-induced mutation load (by either the minimal estimate of APOBEC-signature mutations or the number of COSMIC Signature 2 and 13 mutations) for 973 of these tumors recapitulated previously published results depicting a modest but highly significant positive correlation for both genes.

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