DNA pattern and dietary habits in patients with breast cancer.

An association between dietary fat, micronutrients and breast cancer aetiology and prognosis has been found in studies of experimental animals and in epidemiological studies. The relationship between dietary habits and the nuclear DNA content of breast cancer cells was studied in 82 women aged 50-65 years. A dietary history interview was conducted within 4 months following surgery. Patients having tumours with euploid DNA pattern reported lower mean intake of saturated fatty acids (FA) in absolute terms, lower mean intake of total fat, saturated FA, and monounsaturated FA, in percentage of total energy intake (E%), a higher E% from protein, and a higher intake of vitamin D, and selenium per 10 MJ than did patients having tumours with aneuploid DNA pattern. In the stepwise logistic regression analysis, the multivariate odds ratios (OR) for having a tumour with aneuploid DNA pattern was 1.16 (95% confidence interval, 1.04-1.28) for each 1 g increase in intake of total fat (E%) and 0.95 (95% confidence interval, 0.92-0.99) for each mg increase in selenium intake per 10 MJ. When total fat was substituted with types of fat, the OR for having a tumour with aneuploid DNA pattern was 1.30 (95% confidence interval, 1.07-1.59) for each 1 g increase in intake of saturated FA (E%). These results suggest a correlation between a diet rich in fat and protein and the DNA content of breast cancer cells.