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In her article on the increasing use of contraception to menstruation (Why more and more women are giving up periods, G2, 18 July), Nicola Davis only briefly mentioned the most cancers.
There have been 30-50% lower risk of oral contraceptives that have used oral contraceptives.
The level of protection increases with the length of time and the contraceptive is stopped. Similar, slightly smaller levels of cancer are seen for womb cancer. In contrast, the increased risk of bad cancer and oral contraceptive use is much better known, even though the level of risk is modest and disappears after five years of stopping the pill.
If more efforts can be made to eliminate cancer, it is likely that cancer can be prevented.
Dr. Marc Tischkowitz
Reader in medical genetics, University of Cambridge
• The recent government is providing a solution to poverty. But with the huge amount of plastic products in the UK, is this not an ideal opportunity? Or to boost the agenda of plastic-free schools by 2022? So it's hugely disappointing to see Procter & Gamble, the largest maker of plastic products, on the advisory board. If the government bows to corporate short-termism in this small area, what chance do we have of beating wider climate crisis targets?
Alec Mills
London
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