Pre-clinical (experimental) studies of anti-tumor properties of cell juice of Siberian firs were carried out in the Research Institute of Oncology (Tomsk) on the experimental models of tumor growth (Lewis lung carcinoma, B-16 melanoma) in mice. The fir extract had an anti-tumor activity, which manifested itself in reliable inhibition of the volume to 44% and mass of the tumor to 41%, reduction of the number of metastases and the total area of metastasis to 70%.