The present invention relates to a composition for preventing or treating cancer, which contains, as an active ingredient, a Taxus cambium- or procambium-derived cell line； a lysate thereof； an extract thereof； or a culture medium thereof. The cell line, the lysate, the extract, and the culture medium has minimized side effects compared to the conventional therapeutic drugs, is safe to the human body, is involved directly in the growth of cancer to induce cancer cell death, and shows anticancer activity of inhibiting angiogenesis occurring in carcinogenesis. Accordingly, the cell line, the lysate, the extract and the culture medium is useful for the prevention, treatment and alleviation of cancer.
