| Rank | Clinic Name | Patient Rating | Country | Lead Doctor | experience | Techniques | Best For | Why It’s Ranked | Accreditations |
|---|---|---|---|---|---|---|---|---|---|
| #1 | 4.7 / 5 (438 reviews) | Barcelona, Spain | 27+ years23,000+ treatments | CAR T-cell therapy, CyberKnife for brain tumor | — | — | Joint Commission International , European Foundation for Quality Management | ||
| #2 | 4.6 / 5 (16 reviews) | Madrid, Spain | 31+ years26,000+ treatments | Pituitary tumor surgery, Radiation therapy for brain tumor | — | — | European Foundation for Quality Management, TÜV AG Сompany Research & Investing Certificate | ||
| #3 | 2.5 / 5 (0 reviews) | Madrid, Spain | — | — | Bone marrow biopsy | — | — | European Foundation for Quality Management, Certification according to DIN EN ISO 9001 by TÜV NORD CERT |