Retinoid

Log Reduction Papilloma/mouse

NHK Clonal Growth (IC-50)

trans-Retinoic acid

0.6

−9.5

cis-Retinoic acid

0.42

−9

trans Retinyl methyl ether

0.13

−8

4-Hydroxyphenylretinamide

0.06

−7.5

13-cis-N-Ethylretinamide

0.19

−6.5

trans -Retinoyl-glycine

0.09

−6.5

trans-Retinyl propyl ether

0.05

−6.25