Tel Aviv University researchers have used a combination of low-frequency ultrasound and injected nanobubbles to cause tumors to explode. Lab tests focused only on the area of the tumor, which avoids damage to healthy tissues. It could be used to treat tumors deep inside the body.
https://www.jpost.com/health-and-wellness/article-723059
https://pubs.rsc.org/en/content/articlelanding/2022/nr/d2nr01367c