As you will have seen in the cabbage section, compounds within cauliflower stimulate the production of I3C, which suppresses the protein that triggers excessive cell reproduction that is common to many types of cancer.
Like broccoli, cauliflower also contains indoles, including sulphuraphane, an isothiocyanate that seems to inhibit breast tumours.
Cauliflower also contains glucosinolates, which have been shown in studies to decrease the risk of prostate, breast, lung and colorectal cancer.