BRCA2 and cancer: These could be genetic factors (mutated genes pass from parents to children and cause various cancers, e.g., BRCA1 and BRCA2) and external factors (physical carcinogens: Ionizing and UV radiation; tobacco smoke, alcohol, aflatoxin and arsenic are the examples of chemical carcinogens; certain viruses, bacteria, fungus and some type parasites are considered biological carcinogens; life style factors: lack of exercise, smoking, nutrient imbalance) [5] (https://www.who.int/news-room/fact-sheets/detail/cancer) (accessed on 11 November 2022).