The methanol extract of chaga (sclerotia of Inonotus obliquus) inhibited the promoting effect of 12-Otetradecanoylphorbol-13-acatate (TPA) applied twice weekly on skin tumor formation in mice initiated with 7,12dimethylbenz [a] anthracene. The methanol extract from chaga led to the isolation of eight triterpenoids (1-8). The antiinflammatory activity of the isolated lanostane-type triterpenes was evaluated against TPA-induced inflammatory ear edema in mice. These compounds showed markedly anti-inflammatory effects, with a 50% inhibitory dose of 125-458 nmol/ear.
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