Over the past forty years, the overall incidence of cancer has increased, some forms becoming far more prevalent (cancers of the lungs, bladder and kidneys), others receding (stomach and oesophagus).
Au cours des quarante dernières années, l'incidence totale du cancer a augmenté; de plus, l'incidence de certains cancers s'est nettement accrue (poumon, vessie, rein) tandis que certains autres ont régressé (estomac, oesophage).