The present invention relates to a pharmaceutical composition for the prevention and treatment of cancer comprising arazyme as an active ingredient. More precisely, when arazyme produced by Aranicola proteolycius was administered to the nude mice transplanted with human lung carcinoma cell line, weight gaining, inhibition of tumor cell growth and infiltration, and down-regulations of MMP-9, NF-κB and PCNA, were observed. In addition, when arazyme was treated to human breast cancer cells (MDA-MB-231), down regulations of p21, PCNA (Proliferating Cell Nuclear Antigen), VEGF (Vascular Endothelial Growth Factor), BCl2 (B-cell CLL / lymphoma 2), p-p38, PKC (Protein Kinase C) and MMP-1 (Matrix MetalloProteinase-1) which are involved in tumor cell growth, differentiation, proliferation and metastasis, were observed along with the up-regulation of catalase which inhibits tumor development. Therefore, the arazyme can be effectively used as a pharmaceutical composition for the prevention and treatment of cancer.