CP and neoplasm: In another application of (Ti3C2Tx)MXene material, a nanocomposite drug delivery system (Ti3C2Tx@Met@CP) was established by layer-by-layer adsorption of metformin (Met) and composite polysaccharide (CP) on the surfaces of Ti3C2Tx nanosheets to achieve a combination of PTT/PDT/chemotherapy/immunotherapy for complete tumor eradication and effective inhibition of tumor recurrence and metastasis.