The treatment of metastatic renal cell carcinoma remains insatisfactor
y. Several therapeutic trials with retinoids and r interferon alpha (r
IFN alpha) suggest a synergic antiproliferative effect between retino
id acid and r IFN alpha. Pharmacokinetic data and the mecanism of anti
proliferative effects of retinoids are discussed. The induction of gro
wth arrest is related to the expression of specific retinoid receptors
, Further investigations are required in order to target the patient p
opulation which requires this therapy.