A highly degradable Mg-Al-Ca alloy with superior anti-tumor efficacy.

Molecule hydrogen (H 2) has been used to suppress tumor growth. To employ the H 2 therapy, it is necessary to use a proper agent for continuous generation of H 2. As a biodegradable metal, magnesium (Mg) generates H 2 in an aqueous environment, but the H 2 release rate is still too low. Here, we design a Mg-Al-Ca (AX) alloy that degrades very rapidly due to the presence of a secondary phase Al 2 Ca. Having a reduction potential much higher than Mg and any other Mg-based secondary phases, Al 2 Ca accelerates the corrosion of the Mg matrix by a micro-galvanic process. Al 2 Ca also enhances the strength and ductility of the AX alloy. AX alloy rods show better anti-tumor efficacy than pure Mg rods in vivo. Moreover, implanted AX alloy rods can be heated under an alternating magnetic field to suppress large-size tumors. This work suggests that the H 2 therapy using highly degradable Mg alloys may provide an effective cancer treatment. [ABSTRACT FROM AUTHOR]