Several studies* have concluded that diets rich in vegetables, fruits and grains not only decrease your chance of getting breast cancer but may have a beneficial effect on survival after breast cancer. Sulforaphane, a compound found in broccoli and broccoli sprouts, has been shown to inhibit breast cancer stem cells and keep them from migrating to other areas. Both estrogen-positive and estrogen-negative breast cancer were positively affected by the sulforaphane in broccoli showing a decrease in tumour size and cancer stem cell numbers in the breast tissue. Another study showed that daily intake of the common white button mushroom may have significant chemical agents in them to slow the development of cancer in the breast. It is these two ingredients that are found in this recipe (pdf).
* Mccann, Susan E., et al. “Dietary Lignan Intakes in Relation to Survival among Women with Breast Cancer: the Western New York Exposures and Breast Cancer (WEB) Study.” Breast Cancer Research and Treatment, vol. 122, no. 1, 2009, pp. 229–235., doi:10.1007/s10549-009-0681-x.; Li, Yanyan, et al. “Abstract 4271: Sulforaphane, a Dietary Component of Broccoli/Broccoli Sprouts, Inhibits Breast Cancer Stem Cells.” Cancer Research, vol. 70, no. 8 Supplement, 2010, pp. 4271–4271., doi:10.1158/1538-7445.am10-4271; Grube, Baiba J, et al. “White Button Mushroom Phytochemicals Inhibit Aromatase Activity and Breast Cancer Cell Proliferation.” The Journal of Nutrition, vol. 131, no. 12, 2001, pp. 3288–3293., doi:10.1093/jn/131.12.3288.