| Rank | Clinic Name | Patient Rating | Country | Lead Doctor | experience | Techniques | Best For | Why It’s Ranked | Accreditations |
|---|---|---|---|---|---|---|---|---|---|
| #1 | 4.7 / 5 (440 reviews) | Barcelona, Spain | — | 23,000+ treatments | Immunotherapy with Keytruda (Pembrolizumab) | Advanced or metastatic cancers | Offers immunotherapy with Keytruda, follows Memorial Sloan-Kettering protocols, and has a multidisciplinary team for personalized cancer treatment plans. | Joint Commission International , European Foundation for Quality Management | |
| #2 | 4.4 / 5 (6 reviews) | Barcelona, Spain | 126+ years | Consultation with an oncologist, PET/CT | — | — | Joint Commission International | ||
| #3 | 4.6 / 5 (5 reviews) | Barcelona, Spain | — | — | Immunotherapy with Keytruda (Pembolizumab) | — | — | European Foundation for Quality Management, Certification according to DIN EN ISO 9001 by TÜV NORD CERT |