ABCC1 and neoplasm: This association is highly drug-specific for subgroups treated with the ABCC1 substrates cyclophosphamide (log-rank p = 0.0011) and doxorubicin (log-rank p = 0.0088), independent of age and tumour stage, whereas no association was found in individuals treated with tamoxifen (log-rank p = 0.13) [58].