| Rank | Clinic Name | Patient Rating | Country | Lead Doctor | experience | Techniques | Best For | Why It’s Ranked | Accreditations |
|---|---|---|---|---|---|---|---|---|---|
| #1 | 4.7 / 5 (492) | Barcelona, Spain | 39+ years23,000+ treatments | Radiotherapy for throat cancer, Subtotal thyroidectomy | — | — | Joint Commission International , European Foundation for Quality Management | ||
| #2 | 5.0 / 5 (3) | Madrid, Spain | — | — | Gamma Knife for brain tumor | — | — | Joint Commission International , International Organization for Standardization | |
| #3 | 4.7 / 5 (17) | Madrid, Spain | — | 26,000+ treatments | Radiotherapy for lung cancer, Lung cancer surgery | — | — | European Foundation for Quality Management, TÜV AG Сompany Research & Investing Certificate | |
| #4 | 4.7 / 5 (7) | Pamplona, Spain | — | — | Allogenic bone marrow transplantation from an unrelated donor, Allogenic bone marrow transplantation from a related 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 | ||
| #7 | — / 5 | Santa Cruz de Tenerife, Spain | — | — | Ovarian Biopsy | — | — | ISO 9001:2015 Quality management systems |