This is called the Droit d'oubli and relates to those who have been out of active treatment for 10 years (5 years for young people). If you are wanting travel insurance or insurance to back up a bank loan, for example, you can simply not admit to the cancer.
There is more about this on this website - in French, of course:
https://rose-association.fr/defense-des ... de-cancer/
Nice to know!
There are some quirks, I believe, because the law relates to calculating the date from the end of active treatment. In BC, as an example, if someone has chemo, radio and then hormonotherapy, the date is counted from the end of the radio as hormonotherapy is not classed as "active treatment". I believe that is the same with some of the other cancers.
On the whole, good news