Using lipopeptides or lipoproteins in the treatment of lung infections and tumors

The invention relates to the use of a lipopeptide or lipoprotein for preventing lung inflammation, for increasing the amount of lymphatic tissue in the bronchial mucosa and for treating lung infections and lung tumours. Said lipopeptide or lipoprotein has the general structure (I) wherein R1 and R2 can be the same or different and represent C7-25 alkyl, C7-25 alkenyl or C7-25 alkinyl, X represents S, O or CH2, W represents CO or S(O)n (n = 1 or 2) and Y represents a physiologically acceptable amino acid sequence consisting of between 1 and 13 amino acid radicals, and the asymmetric carbon atom marked with * has the absolute S configuration when X = S (sulphur).