This project aims to document and analyse - with a three-fold anthropological, psychosocial and economical approach - the consequences of the geographical distance from mainland France on the alloSCT on both patients, their caregivers and the healthcare system. It is organised in 3 working packages (WP).

Inclusion Criteria:

• patients diagnosed with hematological malignancy (myeloid acute leukemia, lymphoid acute leukemia, non-hodgkin lymphoma, Hodgkin disease, or myelodysplasic syndrome
• candidate to an allogeneic hematopoietic stem cell transplantation in mainland France ;
• Residing in Reunion Island
• Age >18 year old;
• who accept or not allogeneic hematopoietic
• Able to complete a questionnaire

Exclusion Criteria:

• Opposition to participation and collection of their data
• Person deprived of liberty by judicial or administrative decision, and person subject to legal protection (guardianship or curators)

Patients diagnosed with myeloid acute leukemia, lymphoid acute leukemia, non-hodgkin lymphoma, Hodgkin disease, or myelodysplasic syndrome candidate to an allogeneic hematopoietic stem cell transplantation in mainland