The present invention relates to a pharmaceutical composition containing 13 compounds: 1,3-diolein, 1-linolein-3-olein, 1,2-diolein, 1-olein-2-linolein, 1,2-dilinolein, trilinolein, 1-olein-2,3-dilinolein, 1-palmitin-2,3-dilinolein, 1,3-diolein-2-linolein, 1-palmitin-2-linolein-3-olein, 1,3-dipalmitin-2-linolein, triolein and 1-palmitin-2,3-diolein. The invention also relates to pharmaceutical preparations of this composition and the use thereof in the treatment of tumors and in the immuno-enhancement.