The effectiveness of cancer treatments such as surgery, chemotherapy, radiation therapy, immunotherapy, and targeted therapy depends on various factors. For instance, surgery is often effective for localized cancers that have not spread. Chemotherapy and radiation therapy can be effective for both localized and metastatic cancers, but their success rates differ based on cancer type and stage. Immunotherapy and targeted therapy have shown promising results, particularly in cancers with specific genetic mutations. However, the effectiveness can vary widely among individuals.