| Rank | Clinic Name | Patient Rating | Country | Lead Doctor | experience | Techniques | Best For | Why It’s Ranked | Accreditations |
|---|---|---|---|---|---|---|---|---|---|
| #1 | 4.7 / 5 (485) | Barcelona, Spain | 35+ years870+ treatments | Radiotherapy for prostate cancer, Excision of skull base tumor | — | — | Joint Commission International , European Foundation for Quality Management | ||
| #2 | 5.0 / 5 (1) | Madrid, Spain | — | — | Ovarian Biopsy | — | — | Joint Commission International , International Organization for Standardization | |
| #3 | 4.7 / 5 (17) | Madrid, Spain | — | 26,000+ treatments | Chemotherapy for ovarian cancer, Lung cancer surgery | — | — | European Foundation for Quality Management, TÜV AG Сompany Research & Investing Certificate | |
| #4 | 4.7 / 5 (7) | Pamplona, Spain | — | — | Proton-beam therapy, Allogenic bone marrow transplantation from an unrelated donor | — | — | Joint Commission International , European Society for Medical Oncology | |
| #5 | 4.6 / 5 (5) | Barcelona, Spain | — | — | Ovarian Biopsy | — | — | European Foundation for Quality Management, Certification according to DIN EN ISO 9001 by TÜV NORD CERT | |
| #6 | 2.5 / 5 | Madrid, Spain | 36+ years | Ovarian Biopsy | — | — | European Foundation for Quality Management, Certification according to DIN EN ISO 9001 by TÜV NORD CERT |