Fleur Breteau

Fleur Breteau (born 1975) is a French writer and activist known for her advocacy against the controversial "" in 2025, which in its original form would have reintroduced the use of acetamiprid, a neonicotinoid pesticide that is banned in France since 2020.

Breteau launched the Cancer Anger collective in early 2025 to advocate against the law when it was approved by the Senate. When the National Assembly approved the law in the summer, Breteau helped promote a by making a public spectacle within the gallery, shouting: "You are supporters of cancer ... and we will make it known". The National Assembly, the parliament's lower house, approved the legislation in July. When members of parliament applauded themselves for the effort, Breteau shouted within the chambers: "You are supporters of cancer ... and we will make it known." The spectacle helped propel a to over two million signatories; Le Monde described her as "instrumental" in the petition's success.

Breteau's book, Cancer Colère, tells of her experiences with cancer and her transition into an activist against pesticides as a founder of the Cancer Anger collective; it was published in 2026 by Éditions du Seuil.

Personal life One of three sisters, Breteau was born in Paris in 1975 and later moved to Levallois-Perret. She recalls sending a letter to the president of France when she was eleven years old to complain of the disparity between the price of a sack of rice sent to Ethiopia and the prize money received by a footballer in that year's World Cup finals. Since the early 2000s, Breteau has campaigned against pesticides with Greenpeace. In 2019, she was writer-in-residence at Les plumes de Léon, an organisation that promotes literature in the Dordogne region. Breteau was diagnosed with another breast cancer in August 2024, her second case in four years, on the same day that her friend died of cancer. She began chemotherapy in January, while the Duplomb law was being discussed in the Senate. Her cancer has impacted her income from freelancing as a corporate social responsibility consultant.