DONOR SAFETY 1.HSC donations carries a small, but proven hazard: we must be cautious (VERY) in selecting HSC donor 2. PB donations are not safer than BM Higher death rate and signficantly higher SAE rate for PB vs BM donations. Informed consent should say so 3. Accurate donor screening will reduce risk of lethal complications Lower death risk occurred in UNRELATED donations
GvHD 1.Prophylaxis with 2 drugs (C+M, T+M) is associated with significant acute+chronic GvHD 2. A third agent (ATG or CAMPATH or SIROLIMUS) signifanctly REDUCES acute +GvHD 3. ATG significantly reduces chronic GvHD 4. High dose CY post-Transplant may be a promising new option with or without C+M
Donor Safety Graft versus Host Disease Does reduction of GvHD translate in better OS?
GITMO trial (Thymo) BBMT 2006; 12:560 German trial (Thymo) Lancet Onc ; 2009 OS not significantly different (not inferior) with ATG vs no ATG
Very long follow up (over 10 years), may allow for late complications of chronic GvHD (in particular lung complications) to become clinically relevant
Donor Safety Graft versus Host Disease Does eduction of GvHD translate in better OS? HLA matching criteria
Early Stage Disease: Adverse impact of HLA mismatch HLA-A,B, C, DR Lee et al, 2007 Each mm yield 10-11% worse survival
Advanced Disease: Limited impact of HLA mismatch HLA-A,B, C, DR Lee et al, 2007 Delay had worse consequences than MM
StudyReferenceN.patientsDiagnosis Survival disadvantage in mismatched pairs Type of mismatch One should avoid Seattlle Petersdorf Blood 2004; 104: 2976 1249LeukemiaEarly disC locus NMDP CIBMTR Lee Blood 2007 3860 AML ALL MDS CML Early disA or DRB1 JMDP Takakazu Blood 2007 110; 2235 5210 Malignant and non malignant All patients C locus Non permissive mismatches positions 9,77,80,99,116,156 Seattle Petersdorf Plos Med 2007; 4: 59 246LeukemiaAll patients Haplotype Mismatched GITMO Crocchiolo, Blood 2009, 114:1437 537LeukemiaAll patients DP non permissive mismacth CIBMTRCooley, Blood 2010, 116:2411 1409LeukemiaAMLDonor B gene content <2
KIR genes on Chromosome 19 Segregate indep. From HLA A group (inhibitory receptors) B group (activating receptors) A/A= homozygous for A B/x (at least one B)
Faster Registration on International Donor Registries and Shorter Time to Allogeneic Hematopoietic Stem Cell Transplantation After Having Found a Donor Confers Better Outcome In Acute Leukemia Patients Mauricette Michallet 1, Lyon Abstract 2371 ASH 2010; Patients = 251 with acute leukemia and active donor search 2000-2008 The 3years OS for SD allo-HSCT59% UD allo-HSCT early registration: 47% UD allo-HSCT late registration: 29%
Donor selection EARLY DISEASE 1.Choose 8/8 = A,B,C,DRB1 donors 2. permissive DP mm should be preferred of non permissive mm 3.In AML patients, if possible, with a NK -B cent haplotype ADVANCED DISEASE The earlier, the better
Donor Registries Donor Safety Graft versus Host Disease Does eduction of GvHD translate in better OS? HLA matching criteria Stem cell source
Randomized CTN trial (Anasetti et al ASH 2011) Median follow up 36 months Peripheral BLOODMARROWP 273278 Overall survival51%46%0.3 OS transplanted52%48%0.3 DFS transplanted47%44%0.6 Relapse28%28%0.8 NRM26%27%0,6 ANC 500 day 10095%86%0.09 aGvHD II-IV47%46%0.8 aGvHD III-IV16%14%0.3 cGvHD53%40%0.02 Ext cGvHD46%31%0.01
Stem cell source 1.Same TRM /relapse / LFS 2.More chronic GvHD Both in retrospective and prospective trials
PERIPHERAL BLOOD TRANSPLANTS DONORS # more SAE for PB donations (significant) # more deaths (ns) # should be stated in the informed consent PATIENTS # no protection against relapse # same TRM; same LFS # more chronic GvHD Should we continue to use PB grafts routinely? ??
ACUTE LEUKAEMIA REGISTRY ADULTS TRANSPLANTED FROM 2000 TO 2010 MATCHED UNRELATED DONOR / OS at 5 years AML n=2901ALL n=1655 50%±1 40%±2 21%±2 46%±2 28%±2 13%±2 CR1 (n=1117) CR2 (n=879) ADV (n=905) CR1 (n=804) CR2 (n=510) ADV (n=341)
Matched Unrelated Transplants for SAA Effect of transplant era 10 year OS >2000 (752)67% >1990 (230)44% >1980 (27)29% 1971-80 (1)0% P=0.1 P<0.0001 >2000 1991-00 1971-80 1981-90 days from transplant
Conclusions 1.Caution required for donor harvest (BM and especially PB) 2.Several options for HLA /non HLA donor selection 3.Three agents (C+M+other) for appropriate GvHD prophylaxis 4.Time to transplant= crucial factor 5. Should we continue to use PB??
Your consent to our cookies if you continue to use this website.