Anti tumor effects of spices and condiments has been of research interest in recent times. Some common spices which are proved to be an anti carcinogenic are Turmeric, Ginger, black cumin, garlic,saffron, black pepper, red chilli etc.
Among the mentioned spices, Turmeric (Curcumin) is most widely researched and found very useful in prevention and treatment of many types of cancer. The recommended dosage of curcumin is 6.0g/day.
Several spices such as Curcuma longa, Nigella sativa, Zingiber officinale, Allium sativum and Cinnamomum malabatrum have anti-cancer properties. Please take a look at the following RG links for details.
Article Spices for Prevention and Treatment of Cancers
Article Curcumin: From Food Spice to Cancer Prevention
Curcumin and resveratrol are antioxidant and have a positive effect on apoptosis of cancer cells. Moreover they inhibit migration of certain type of cancer cells and inhibit angiogenesis thus preventing the formation of metastasis.In RG there are many recent reviews on the subject