| Rank | Clinic Name | Patient Rating | Country | Lead Doctor | experience | Techniques | Best For | Why It’s Ranked | Accreditations |
|---|---|---|---|---|---|---|---|---|---|
| #1 | 4.6 / 5 (542) | Istanbul, Turkey | — | — | Hyperthermic Intraperitoneal Chemotherapy (HIPEC), Gamma Knife for brain tumor | — | — | Planetree's Gold Certificate, International Accreditation System for Interventional Oncology Services (IASIOS) | |
| #2 | 4.6 / 5 | Vienna, Austria | — | — | Radiotherapy for uterine cancer, Radiation therapy for brain tumor | — | — | World's Best Hospitals 2026 by Newsweek | |
| #3 | 4.5 / 5 (263) | Istanbul, Turkey | 20+ years | Radiotherapy, Resection of glioma | — | — | Joint Commission International , Turkish Medical Association (Türk Tabıplerı Bırliği) | ||
| #4 | 4.6 / 5 (432) | Istanbul, Turkey | — | — | Brain tumor removal, Immunotherapy | — | — | International Organization for Standardization, Joint Commission International | |
| #5 | 4.7 / 5 (494) | Barcelona, Spain | — | 23,000+ treatments | HIFU for prostate cancer treatment, Chemotherapy for liver cancer | — | — | Joint Commission International , European Foundation for Quality Management | |
| #6 | 4.8 / 5 (9) | Istanbul, Turkey | — | — | Immunotherapy with Keytruda (Pembolizumab), Chemotherapy | — | — | — | |
| #7 | 5.0 / 5 (58) | Istanbul, Turkey | — | — | Radiotherapy, Brain tumor removal | — | — | Joint Commission International , International Organization for Standardization | |
| #8 | 4.6 / 5 | Madrid, Spain | — | — | Online Consultation with Radiation Oncologist | — | — | Joint Commission International , European Society for Medical Oncology | |
| #9 | 5.0 / 5 (3) | Madrid, Spain | — | — | Gamma Knife for brain tumor, Online Consultation with Radiation Oncologist | — | — | Joint Commission International , International Organization for Standardization | |
| #10 | 4.7 / 5 (19) | Istanbul, Turkey | — | — | Chemotherapy, Online Consultation with Radiation Oncologist | — | — | International Organization for Standardization, Joint Commission International |