CD4 and gastric cancer: Finally, these authors investigated the cytotoxic effect of the CD3, CD4 and CD5 complexes and that of pinocembrin on the gastric cancer cell line NCI-N87, reporting that the three propolis complexes had moderate cytotoxic activity, since they only inhibited 32.7%, 24.6% and 21.8% of these cells, respectively, at a concentration of 200 μg/mL.