Breast cancer can return 20 years after a woman is first diagnosed, women might be told to continue taking hormonal drugs for longer than the current five years, in a bid to stop tumours returning. Scientists analysed data from clinical trials involving different women, all of whom had the most common form of breast cancer caused by the hormone oestrogen.
Breast cancet patient received pill treatments such as tamoxifen or aromatase inhibitors which block the effects of oestrogen or shut off the hormone's supply. After five years of therapy, their cancers had gone and they stopped taking the drugs. But monitoring the women's progress revealed recurrences of the disease up to 15 years later – 20 years after initial diagnosis.
Women who started off with large tumours and cancer that had spread to four or more lymph nodes faced the highest risk of recurrence, they had a 40 per cent risk of cancer returning in a different part of the body over a period of 15 years after treatment. For patients diagnosed with small, low-grade cancers that had not spread the risk was 10 per cent.
Recent research has suggested that extending hormone therapy to 10 years may be more effective at preventing breast cancer recurrence and death, five years of tamoxifen reduces the risk of recurrence after treatment. Aromatase inhibitors, which only work for post-menopausal women are more effective.
However, some patients choose to stop the hormone treatments early because of side effects such as menopausal symptoms, osteoporosis, joint pain or carpal tunnel syndrome.This research shows that stopping hormone treatment at five years leaves women with an ongoing risk of breast cancer coming back in future.
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