Question

A method of treating cancer or tumor growth using chemicals is known as?

Answer 1

Chemotherapy

Chemotherapy (often abbreviated to chemoand sometimes CTX or CTx) is a type of cancer treatment that uses one or more anti-cancer drugs as part of a standardized chemotherapy regimen. 

However chemotherapy does not always work, and even when it is useful, it may not completely destroy the cancer.

Answer 2

 using chemicals that destroy selective cells known as Chemotherapy