times in another experiment immunoglobulin production igg igm iga ige from isolated human b lymphocytes was assayed after pre incubation of cells with mastic oil it was found that the agent does not modify at least at the dilutions used the production of immunoglobulins indicative of its anti inflamatory action in a final experiment we have assayed the activation of different cell populations and its possible modification by mastic oil we show that pre incubation of cells with mastic oil decreased the activation of different cell populations especially t and b lymphocytes indicative of a protective effect of the agent against inflammatory processes in contrast after long incubation times an activation of nk cells is observed additional explanations of the invention are given in the following examples which are not to be regarded as limiting the protection provided by the claims pure mastic oil was diluted in absolute ethanol 1 100 v v dilution 10 u2212 2 and subsequently in culture medium the human epithelial cell lines t47d from breast cancer hormone sensitive lncap and du145 from prostate cancer hormone sensitive and resistant respectively and hepg2 from hepatocellular carcinoma were tested all these cell lines represent early stages of the corresponding diseases retaining the majority of characteristics of their corresponding normal counterparts the effect of mastic oil was assayed after two cell cycles our results are presented in fig1 as shown the agent differentially affects the proliferative capacity of each cell line in breast and prostate cell lines.