Surprisingly, it is a disease with low heritability ㄷㄷㄷㄷㄷㄷㄷ

In fact, hereditary cancer accounts for about 5% of all cancers, and most of them originate from environmental factors such as eating habits and lifestyle.

According to a report published by the International Agency for Research on Cancer (IARC), 15-30% of cases are caused by smoking, 10-25% by chronic infections, and 30% by food.

In other words, because environmental factors such as family members, eating habits, and lifestyle are similar, many people get similar cancers, and it appears to be a hereditary cancer.