To provide a biomarker that can serve as a cancer treatment target.SOLUTION: Cancer can be treated by detecting whether a biological sample taken from a subject includes a fusion protein herein, such as MGEA5-RET fusion protein, or a fusion gene herein, such as MGEA5-RET fusion gene, and administering the subject confirmed to have such protein or gene included in the biological sample therefrom (namely, a cancer patient) with a substance to inhibit the expression or bioactivity of the fusion protein.SELECTED DRAWING: None

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