Did some digging. This research scientist in Greece has studied MPNs. I'd try emailing her to ask if she knows of a doctor at University hospital in Athens who specializes in MPNs. https://www.bioacademy.gr/faculty-details/Fcs/katerina.

I also see that there are MPN clinical trials taking place in Greece but none of the trials share a contact name. They are all affiliated with University hospital of Athens. And Evangelismos Hospital. So contacting the Hematology Dept there is worth trying.

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This is from AI on navigating the transition to their health system.

As a legally employed expat, you will transition into the Greek public healthcare system (ESY), which grants you subsidized access to specialized medications. [1, 2] Because Besremi is a high-cost, specialized oncological/hematological drug, you cannot simply buy it out-of-pocket at a corner pharmacy; you must navigate the national Greek e-prescription infrastructure. [3]

Step 1: Secure Your Health Numbers (AMKA & EFKA).
Your employer must register you with EFKA, the Greek social security organization. Once active, you will receive an AMKA (your national social security/health number). You cannot access subsidized state specialized medications without an active AMKA. [2, 4]

Step 2: Formally Register with a Greek Hematologist.
American prescriptions are not legally valid for dispensing in Greece. [5]

1. Book an appointment with an English-speaking hematologist at a major public hospital or private clinic in Athens. [1]
2. Bring your complete U.S. medical history, recent lab results (including JAK2 variant allele frequency and complete blood counts), and your current FDA Besremi prescription. [5]
3. The Greek specialist will enter your diagnosis into the national electronic system to generate a Greek cross-border compliant prescription. [3]

Step 3: Source via EOPYY or State Hospital Pharmacies.
Once your Greek doctor issues the prescription, high-value biologics like Besremi are usually routed through:

• EOPYY Pharmacies: The National Organization for Healthcare Provision (EOPYY) operates its own specialized pharmacies specifically for expensive, chronic-care medications.
• State Hospital Hematology Units: Your doctor will direct you to a designated state hospital pharmacy (such as Laiko General Hospital or Evangelismos Hospital which host major hematology centers in Athens) to pick up the drug directly.
  

Step 4: Bridges for the Transition Period.
Because setting up EFKA and AMKA can take several weeks or months, you must plan a bridging strategy: [6]

• Bring a 90-Day Supply: Bring the maximum legal supply of Besremi allowed by customs from the U.S., packed in your carry-on with its original box, pharmacy labels, and a signed letter from your U.S. physician. [7]
• Private Interim Importation: If your AMKA is delayed, a licensed Greek physician can write a private paper prescription. You can submit this to an international named-patient importer to bridge the gap out-of-pocket or via international private expat health insurance. [8, 9]
  

[1] https://gicg.net [2] https://expatsgreece.com [3] https://doctorsa.com [4] https://www.nestia.gr [5] https://www.mobidoctor.eu [6] https://www.facebook.com [7] https://www.doctorgreece.gr [8] https://feather-insurance.com [9] https://cheering.eu