An application of PEG-interferon and a protooncogene product targeting inhibitor in synergistic inhibition of tumors. Specifically, provided is use of an active ingredient combination. The active ingredient combination comprises PEG-interferon and a protooncogene product targeting inhibitor, and the combination is used for preparing a pharmaceutical composition for synergistic treatment of tumors. The active ingredient combination can synergistically inhibit the growth of tumors (especially lung, stomach, breast and liver cancers) effectively, and can significantly reduce toxic and side effects, and therefore can be widely used in targeted therapy of the tumors.
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