Abstract: The present invention relates to a selenium-containing substance for the treatment of cancer. Specifically, the present invention provides use of a seleno-amino acid for preparing a composition or a preparation. The composition or the preparation is used for preventing and/or treating cancer. It is found for the first time in the present invention that the seleno-amino acid can effectively prevent and/or treat cancer.

Abstract: A polyurethane-acrylic composition, and particularly, a polyurethane-acrylic composition that is environment friendly and exhibits low heat shrinkage, which is suitable for use as a waterproof coating for a construction structure, especially for a roof. The polyurethane-acrylic composition includes:—at least one aqueous acrylic polymer dispersion, preferably in an amount of 17-56 wt %, preferably 20-45 wt %, based on the total weight of the composition; and—at least one aqueous polyurethane dispersion, preferably in an amount of 4-30 wt %, preferably 4-10 wt %, based on the total weight of the composition; wherein the composition is free of a coalescing agent.