Biodegradable Cascade‐Amplified Nanotheranostics for Photoacoustic‐Guided Synergistic PTT/CDT/Starvation Antitumor in the NIR‐II Window

-mediated cascade-amplifying CDT. The specific PTT facilitated by undegraded Pd accelerates the Fenton-like reaction, establishing a positive feedback process for self-enhancing synergetic PTT/CDT/starvation therapy via the NIR-II guided-PAI. Therefore, the multifunctional nanotheranostics presents a simple and versatile strategy for the precision diagnosis and treatment of tumors.