Coffee could make breast cancer drug tamoxifen more effective

NHS: "A cancer-killing cocktail of the hormone drug tamoxifen and two coffees every day was found to reduce the risk of [breast cancer] tumours returning," the Mail Online reports. The same study also found evidence that caffeine slowed the cancer's growth. Tamoxifen is a hormonal treatment used to treat cases of breast cancer known to be associated with the hormone oestrogen (known as oestrogen-dependent breast cancer).
The study found that women who reported drinking two to five cups of coffee a day had smaller primary tumours and a lower proportion of oestrogen-dependent tumours than those who drank one cup of coffee or less.