Abstract
Evaluating the effectiveness and tolerability of chemotherapy in hairy cell leukemia: A comprehensive systematic review and meta-analysis.
Author
person
Jawad Basit
Rawalpindi Medical University, Rawalpindi, Pakistan
info_outline
Jawad Basit, Zaofashan Zaheer, Aleena Ahmed, Maurish Fatima, Usman Ali Akbar, Nithya Ramesh, Asna Shahab, Mohammad Ebad Ur Rehman, Zunairah Shah, Sajeel Saeed, Mahboob Ahmad, Azka Aisha
Full text
Authors
person
Jawad Basit
Rawalpindi Medical University, Rawalpindi, Pakistan
info_outline
Jawad Basit, Zaofashan Zaheer, Aleena Ahmed, Maurish Fatima, Usman Ali Akbar, Nithya Ramesh, Asna Shahab, Mohammad Ebad Ur Rehman, Zunairah Shah, Sajeel Saeed, Mahboob Ahmad, Azka Aisha
Organizations
Rawalpindi Medical University, Rawalpindi, Pakistan, King Edward Medical University, Lahore, Pakistan, King Edward Medical University Pakistan, Jhelum, Pakistan, North Shore University Hospital, Manhasset, NY, Mercy Catholic Medical Center, Lansdowne, PA, Conemaugh Memorial Medical Center, Johnstown, PA, Louis A Weiss Memorial Hospital, Chicago, IL, Nishtar Medical University Multan, Multan, Pakistan
Abstract Disclosures
Research Funding
No funding received
None.
Background:
Hairy cell leukaemia (HCL) is a rare, chronic B cell cancer that involves the bone marrow, peripheral blood, and spleen. Many treatment options are available for HCL. Our study aims to elucidate the safety and efficacy of each intervention through the pooled proportion of response to treatment and adverse events.
Methods:
We conducted a literature search across PubMed, Embase, Cochrane, and Google Scholar from inception till February 2023. We included clinical trials and cohorts of patients with HCL receiving modern anticancer drugs (cladribine, rituximab, cladribine plus rituximab, BRAF inhibitors, anti-CD22 monoclonal antibodies, and ibrutinib). The primary efficacy outcomes were Objective Response Rate (ORR) and Complete Response Rate (CRR) and the primary safety outcome was adverse effects (AEs). We used OpenMetaAnalyst to pool data using the Hedges-Olkin Random Effects Model, with subgroup analysis for HCL type and study design.
Results:
Our meta-analysis included 44 studies (28 trials and 16 cohorts) with 3976 patients with HCL. The median age was 56.7 years. The highest efficacy was seen in patients receiving combination therapy of cladribine and rituximab, with an ORR of 97% and CRR of 92%. Cladribine monotherapy showed an ORR of 95% and CRR of 79%, while rituximab monotherapy had an ORR of 62% and CRR of 31%. BRAF inhibitors, anti-CD22 monoclonal antibodies, and ibrutinib showed less efficacy, with ORRs of 92%,78% and 51% and CRRs of 41%, 49%, and 17% respectively. Subgroup analysis for study design and HCL type did not resolve heterogeneity. The ORR and CRR with 95% Confidence Intervals and AEs for each regimen are given in the table.
Conclusions:
Cladribine with rituximab is the most effective treatment for untreated and relapsed HCL patients, with neutropenia as the most common AE. Since we pooled the proportions for treatment-naïve and relapsed cases together due to inavailability of segregated data, the results should be used cautiously in clinical decision making and limit the derivation of consensus for treatment of newly diagnosed or relapsed HCL.
Cladribine
n = 2806
Rituximab
n = 64
Combination Therapy:Cladribine and Rituximab
n = 149
BRAF inhibitors n = 196
Anti-CD22 Monoclonal Antibodies
n = 260
Ibrutinib
n = 65
Number of studies
22
10 trials, 12 cohorts
3 trials
5
3 trials, 2 cohorts
7 trials
5
3 trials, 2 cohorts
2 trials
Median Age (years)
53.9
56
56.8
61.6
57.7
64.5
ORR (95%C.I)
95% (0.91, 0.98)
62%(0.26,0.98)
97%(0.92, 1.0)
92&(0.88,1.0)
77%(0.71,0.84)
51%(0.39,0.63)
CRR(95% C.I)
79% (0.73, 0.84)
31%(0.08,0.54)
92%(0.83,1.0)
41%(0.32, 0.495)
49%(0.40,0.59)
17%(0.08,0.26)
Neutropenia
n = 150/213,72.3%*
NR
n = 25/90,23.6%*
NR
n = 6/160,3.3%*
n = 13/65,19.9%*
Lymphocytopenia
NR
NR
n = 34/90(39.3%,p = 0.06)
NR
n = 22/160,13.3%*
n = 13/65,19.9%*
Infections Grade≥3
n = 146/811,14.6%*
NR
n = 13/70(17.3%,p = 0.25)
NR
NR
n = 19/65,28.9%*
8 organizations
6 drugs
5 targets
Organization
Rawalpindi Medical UniversityOrganization
King Edward Medical UniversityOrganization
King Edward Medical University PakistanOrganization
North Shore University HospitalOrganization
Mercy Catholic Medical Center, Lansdowne, PAOrganization
Conemaugh Memorial Medical CenterOrganization
Louis A Weiss Memorial HospitalOrganization
Nishtar Medical University Multan PakistanDrug
cladribineDrug
VarlilumabDrug
BRAF inhibitorsDrug
ibrutinibTarget
cladribineTarget
BRAFTarget
ibrutinibTarget
CD20+Target
CD22+ B-ALL