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This item is taken from the monthly magazine Sciences et Avenir n°950, dated April 2026.
Colorblind patients with bladder cancer have a 52% higher risk of mortality over twenty years, according to an American study conducted by Ehsan Rahimy of Stanford University (USA).
A delay in diagnosis related to color perception
The problem lies in the difficulty in perceiving red, which often prevents the detection of the main early sign of the disease: the presence of blood in the urine. This lack of awareness delays diagnosis, leading to the disease being treated at a more advanced stage.
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