| Rank | Clinic Name | Patient Rating | Country | Lead Doctor | experience | Techniques | Best For | Why It’s Ranked | Accreditations |
|---|---|---|---|---|---|---|---|---|---|
| #1 | 3.8 / 5 (6) | Madrid, Spain | — | Bone marrow transplantation, Allogenic bone marrow transplantation from an unrelated donor | — | — | World's Best Hospitals 2021 by Newsweek | ||
| #2 | 4.7 / 5 (17) | 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 | Madrid, Spain | — | — | Сonsultation with an oncohematologist | — | — | European Foundation for Quality Management, Certification according to DIN EN ISO 9001 by TÜV NORD CERT |