Her memoir – ‘The Undying: A Meditation on Modern Illness’ – went beyond her own medical treatment. When it comes to searching for the causes of cancer, she writes how, in addition to studying genes, it’s just as important to examine the water we drink. The Pulitzer Prize-winning poet has also criticized the hypocrisy of certain patrons of scientific research. An American now living and teaching in Scotland, she spoke with EL PAÍS while on a visit to Madrid