Determine the efficiency of a myéloablative conditioning associating Fludarabine, Thymoglobuline, and intravenous Busulfan with adapted dose, according to a pharmacokinetics realized in the first day of administration (or J-6 of the conditioning) of the busulfan, in preparation for a allogenic transplant family or not family compatible HLA.

Inclusion Criteria :

• Informed consent signed,
• Patient affiliated to a social security system or benefiting from such a system,
• Related HLA identical donor or unrelated HLA identical donor :

all patients aged > 55 years with hematological malignancy and deemed eligible for an allogeneic transplant from a geno-identical donor and pheno-identical 10/10

- the basic pathology should be considered "chemo-sensitive" complete or partial remission (CR, PR) or stable disease

Exclusion Criteria :

• Pregnant or lactating woman or without contraception (for child bearing potential women)
• Patient deprived of liberty or under supervision of a guardian
• Impossibility to undergo medical examinations of the study for geographical, social or psychological reasons
• Usual contra-indications for allogenic transplant
• Aged < 55 years
• History of allogenic transplant
• Concomitant neoplastic disease
• Evolutive psychiatric disease
• HIV seropositivity or C hepatitis under treatment
• Women of childbearing age or man, in the absence of effective contraception during treatment and up to 12 months after treatment discontinuation