“…Of 18 case-control studies, 14 (LaVecchia et al, 1987;Katsouyanni et al, 1988;Rohan et al, 1988;Iscovich et al, 1989;van 't Veer et al, 1990;Graham et al, 1991;Ingram et al, 1991;Lee et al, 1991;Zaridze et al, 1991;London et al, 1992;Levi et al, 1993;Holmberg et al, 1994;Freudenheim et al, 1996;Negri et al, 1996) observed a reduced risk of breast cancer among those in the highest category of carotenoid intake, whereas four (Marubini et al, 1988;Toniolo et al, 1989;Ewertz and Gill, 1990;Richardson et al, 1991) observed no reduction in risk. Of the inverse associations, six (Graham et al, 1991;Lee et al, 1991;Zaridze et al, 1991;Holmberg et al, 1994;Freudenheim et al, 1996;Negri et al, 1996) were statistically significant. A combined analysis of the data from eight case-control studies reported an odds ratio of 0.85 (P = 0.007) for the highest versus the lowest quintile of carotenoid intake (Howe et al, 1990).…”