What types of cancer are treated with low dose chemotherapy? 

Low-dose chemotherapy has been studied and used for treating various types of cancers, including:

• Breast cancer
• Ovarian cancer
• Lung cancer
• Prostate cancer
• Liver cancer
• Gastrointestinal cancers
• Brain cancers (glial cell tumors)
• Kidney cancer
• Neuroendocrine tumors
• Sarcomas
• Melanomas
• Head and neck cancers
• Multiple myeloma

Regarding effectiveness, the meta-analysis in result  provides some important insights:

1. Overall effectiveness: The study found that low-dose chemotherapy achieved similar efficacy to conventional-dose chemotherapy in terms of overall response rate, overall survival, and progression-free survival.
2. Reduced side effects: Low-dose chemotherapy resulted in significantly fewer severe adverse events compared to conventional-dose chemotherapy, particularly for mucositis, thrombocytopenia, anemia, and febrile neutropenia.
3. Comparable outcomes: There were no statistically significant differences in treatment-related death, diarrhea, leucopenia, neutropenia, and nausea/vomiting between low-dose and conventional-dose chemotherapy.

However, it's important to note that while these results are promising, more research is needed.