The eight genes shared between BC cells exposed to the three doses of proton irradiation used are as follows: chromosome 9 open reading frame 131 (C9orf131); uncharacterized protein MGC16142 (MGC16142); ATP-binding cassette, subfamily A (ABC1), member 10 (ABCA10); inositol polyphosphate-5-phosphatase (INPP5D); engrailed homeobox 1 (EN1); solute carrier family 6 (neurotransmitter transporter), member 13 (SLC6A13); AS1FAM13A antisense RNA 1 (FAM13A); and chromosome 8 open reading frame 34 (C8orf34). Here, SLC6A2 is linked to breast cancer.