[New drugs; sunitinib and sorafenib].

Sunitinib and sorafenib are both indicated for the treatment of advanced kidney carcinoma of the 'clear cell' type after failure of, or resistance to, other treatments. Both drugs inhibit the tyrosine-kinase activity of a number of growth factor receptors; sorafenib has an additional inhibitory effect on serine/threonine-kinase activity. This mechanism decreases signal transduction and results in an inhibition of tumour cell growth and angiogenesis. The adverse effects of the two drugs are different: sunitinib causes mainly fatigue and gastrointestinal discomfort, whereas sorafenib's most frequent adverse effects are diarrhoea, rash, the palmar-plantar erythrodysaesthesia syndrome, and hypertension.