Table 2.

Discussion of environmental factors on breast cancer pages of National Cancer Institute and American Cancer Society websites (463 NCI URLs and 348 ACS URLs that specifically address breast cancer rather than the websites in full)

Risk Factor	Representative terms analyzed on websites	Number of mentions on NCI website	Number of mentions on ACS website
Family history	Family history	249	74
Breast density	Breast density, dense breasts	171	66
Genetics	Genetics, BRAC1, BRAC2	140	67
Exercise	Exercise, physical activity, physically active	96	340
Hormone replacement therapy	HRT	37	100
Alcohol	Alcohol	34	69
Birth control	Birth control, oral contraceptives	32	27
Diet	Diet	28	172
Body weight	Overweight, obese	21	77
Contamination	Contaminant(s), contamination	9	0
Pesticides	Pesticide(s)	2	1
Diethylstilbestrol	Diethylstilbestrol, DES	2	5
Bisphenols	BPA, bisphenol(s)	0	0
Pollution	Pollution, pollutant(s)	0	1
Parabens	Paraben(s)	0	25
Endocrine disrupting chemicals	Endocrine disruptor(s), endocrine disrupting chemical (s), hormone disrupting chemical(s)	0	1
Phthalates	Phthalate(s)	0	0
The precautionary principle	Precautionary principle	0	0
Flame retardants	Flame retardant(s)	0	0
Air pollution	Air pollution	0	0
Polycyclic aromatic hydrocarbons	PAH(s)	0	0
PFAS	PFOA, PFOS, PFAS, PFC(s), perfluorinated chemicals	0	0
Oxybenzone	Oxybenzone	0	0