Abstract: MK (midkine) was found to rise in the blood or urine of patients with various types of cancers at early stage. Based on this finding, a method for detecting early cancer, comprising the step of measuring MK in blood or urine was completed.

Abstract: A power supply device includes a power supply member having: a first conductive plate electrically connected with one of positive and negative terminals of a power source; a second conductive plate electrically connected with the other terminal; a first insulating layer provided between the first conductive plate and the second conductive plate; a second insulating layer provided on an outside surface of the second conductive plate; a plurality of supply electrode members attached on an outside surface of the second insulating layer, the plurality of supply electrode members being spaced from one another, one supply electrode member being electrically connected with the first conductive plate, another supply electrode member adjacent to the one supply electrode member being electrically connected with the second conductive plate; a plurality of current collecting electrode members provided in a movable object which is movable on a specified plane, one of at least two current collecting electrode members being