Chemoprevention of Head and Neck Cancers: Does It Have Only One Face?

Table 1

Inhibitors of carcinogen induced neoplasia (taken from [18] and modified).

Blocking agents	Suppressing agents
Phenols	Retinoids
(i) Ellagic acid	Carotenoids
(ii) Caffeic acid	Selenium salts
(iii) Ferulic acid	Proteases inhibitors
(iv) p-hydroxycinnamic acid	Inhibitors of arachidonic acid metabolism
Indols	Cyanates and isocyanates
Aromatic isothiocyanates	Phenols
Coumarins	Plant sterols
(i) Coumarin	Methylated xanthines
(ii) Limettin	(i) Caffeine
Flavones	Others
Dithiothiones	(i) Dehydrepiadrosterone
Diterpens	(ii) Fumaric acid
Ditiocarbamates
Phenothiazines
Barbiturates
Trimethylquinolines