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Tyrosine kinase inhibitor (TKI) therapy is administered to patients with Philadelphia chromosome-positive acute lymphoblastic leukemia (Ph+ ALL) following allogeneic hematopoietic cell transplantation (allo-HCT) as a means to lower relapse rates. Previous studies aimed at determining the role and duration of maintenance TKI therapy have generated conflicting results, and a definitive randomized trial for TKI therapy had not been established. A recent retrospective study published in Blood by Saini et al.1 compares the clinical outcomes of patients with Ph+ ALL receiving allo-HCT with and without TKI maintenance, and attempts to identify the optimal duration of maintenance TKI therapy.
Table 1. Patient characteristics1
allo-HCT, allogeneic hematopoietic cell transplantation; CMR, complete molecular response; CR1, first complete remission; CR2, second complete remission; CR3+, third or subsequent remission; HCT-CI, hematopoietic cell transplantation-specific comorbidity index; HCVAD, hyper-CVAD [cyclophosphamide + vincristine + doxorubicin + dexamethasone]; MMR, major molecular response; MRD, measurable residual disease; Ph+, Philadelphia chromosome–positive; TKI, tyrosine kinase inhibitor |
|
Characteristic |
Patients (N = 165) |
---|---|
Age, years (range) ≤ 40 >40 |
41 (3–70) 49% 51% |
Sex, male |
61%
|
Cytogenetics at diagnosis Ph+ alone Ph+ plus other cytogenetics Unknown |
54% 42% 4% |
Decade of allo-HCT 2001–2009 2010–2018 |
44% 56% |
HCT-CI score 0 1 ≥ 2 Unknown |
55% 8% 34% 3% |
Disease status at allo-HCT CR1 CR2 CR3+ |
68% 26% 3% |
Presence of MRD at allo-HCT CMR MMR No CMR/MMR Unknown |
49% 13% 28% 10% |
TKI Maintenance post allo-HCT |
59% |
Median time to initiate TKI therapy, months post allo-HCT |
2.4 |
Induction of chemotherapy prior to allo-HCT HCVAD + TKI Others Not available |
88% 10% 2% |
Table 2. Summary of clinical outcomes1
CR1, first complete remission; OS, overall survival; PFS, progression-free survival; Ph+ ALL, Philadelphia chromosome–positive acute lymphoblastic leukemia |
|
Outcome |
Percentage (%) |
---|---|
Patients that had progressed at last follow-up (Median follow-up, 67 months [range, 7–180]) |
53 |
Patients that had died at time of last follow-up |
51 |
All Ph+ ALL patients 2-year/5year PFS 2-year/5-year OS |
54/46 59/49
|
Ph+ ALL patients transplanted in CR1 2-year/5-year PFS 2-year/5-year OS |
69/57 73/53 |
The study demonstrates that early initiation of TKI maintenance therapy posttransplant decreases the incidence of relapse and improves outcome in patients with Ph+ ALL. TKI maintenance therapy should be continued for at least 2 years post allo-HCT, however prospective trials are needed to better determine the optimal maintenance duration.
References
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