Understanding and Managing Immune Effector Cell �Toxicities in Hematologic Malignancies in 2025�
David Reeves, PharmD, BCOP
Professor of Pharmacy Practice
Butler University
Clinical Pharmacy Specialist – Hematology/Oncology
Franciscan Health Indianapolis
�
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Objectives & Disclosure
Disclosure
Assess the risk for immune effector toxicity associated with therapies for hematologic malignancies
Propose a strategy to manage a patient experiencing immune effector toxicity
Immune Effector Cell Toxicity
Cytokine Release Syndrome (CRS)
Immune Effector Cell –Associated Neurotoxicity Syndrome (ICANS)
Blood Reviews. 2019;34:45-55
https://www.nccn.org/professionals/physician_gls/pdf/immunotherapy.pdf
https://www.cancersupportcommunity.org/car-t-cell-therapy
Chimeric Antigen Receptor T-Cell (CAR T-cell)
Bispecific T-Cell Engager (BTCE)
Br J Cancer. 2021;124:1037-1048
Chimeric Antigen Receptor (CAR) T-cell Therapy
https://www.nccn.org/professionals/physician_gls/pdf/immunotherapy.pdf
FDA Approved Agents | Target | Indication (Line of therapy) |
Axicabtagene Ciloleucel (Axi-Cel) (Yescarta) | CD19 | FL (3), LBCL (2) |
Brexucabtagene Autoleucel (Brexu-Cel) (Tecartus) | ALL (2), MCL (2) | |
Lisocabtagene Maraleucel (Liso-Cel) (Breyanzi) | LBCL (2), CLL/SLL (3), FL (3), MCL (3) | |
Obecabtagene Autoleucel (Obe-Cel) (Aucatzyl) | ALL (2) | |
Tisagenlecleucel (Tis-Cel) (Kymriah) | ALL (3), LBCL (3), FL (3) | |
Ciltacabtagene Autoleucel (Cilta-Cel) (Carvykti) | BCMA | MM (2) |
Idecabtagene Vicleucel (Ide-Cel) (Abecma) | MM (3) |
Derived from prescribing information for each medication as of 12/2024
Bispecific T-Cell Engagers (BTCE)
FDA Approved Agents | Target | Indication |
Blinatumomab (Blincyto) | CD 19 | ALL w/ MRD, ALL consolidation, r/r ALL |
Epcoritamab (Epkinly) | CD20 | DLBCL (3rd line), FL (3rd line) |
Glofitamab (Columvi) | DLBCL (3rd line) | |
Mosunetuzumab (Lunsumio) | FL (3rd line) | |
Elranatamab (Elrexfio) | BCMA | MM (5th line) |
Teclistamab (Tecvayli) | MM (5th line) | |
Talquetamab (Talvey) | GPRC5D | MM (5th line) |
r/r: relapsed refractory
Derived from prescribing information for each medication as of 12/2024
Br J Cancer. 2021;124:1037–1048
ASTCT Consensus Grading for CRS/ICANS
CRS | Grade 1 | Grade 2 | Grade 3 | Grade 4 |
Fever | Temp ≥ 38°C | Temp ≥ 38°C | Temp ≥ 38°C | Temp ≥ 38°C |
| WITH | |||
Hypotension | None | Not requiring vasopressors | Requiring a vasopressor w/ or w/o vasopressin | Requiring multiple vasopressors (excluding vasopressin) |
| And/or | |||
Hypoxia | None | Requiring low-flow nasal cannula | Requiring high-flow nasal cannula, facemask, nonrebreather mask, or Venturi mask | Requiring positive pressure (e.g., CPAP, BiPAP, mechanical ventilation) |
Biol Blood Marrow Transplant. 2019;25:625-638.
ICANS | Grade 1 | Grade 2 | Grade 3 | Grade 4 |
ICE Score | 7-9 | 3-6 | 0-2 | 0 (unarousable) |
Awakens to: | Spontaneously | To voice | Only to tactile stimulus | Unarousable or requires vigorous tactile stimuli. Stupor or coma |
Seizure | N/A | N/A | Any clinical seizure that resolves rapidly or nonconvulsive seizures on EEG resolving w/ intervention | Life-threatening prolonged seizure (> 5 min); or Repetitive clinical or electrical seizures without return to baseline in between |
Motor Findings | N/A | N/A | N/A | Deep focal motor weakness |
Elevated ICP/cerebral edema | N/A | N/A | Focal/local edema on neuroimaging | Diffuse cerebral edema on neuroimaging; decerebrate or decorticate posturing; or cranial nerve VI palsy; or papilledema; or Cushing’s triad |
Agent Specific Toxicity Rates
*Includes all neurotoxicity. Rates derived from Prescribing Information for each medication as of 12/2024
CAR T-cell Therapies | Target | Costimulatory domain | CRS | Severe CRS | ICANS | Severe ICANS |
Axi-Cel | CD19 | CD28 | 93% | 13% | 64% | 28% |
Brexu-Cel | CD28 | 89-91% | 15-24% | 60-63% | 25-30% | |
Liso-Cel | 4-1BB | 42% | 2% | 30% | 10% | |
Obe-Cel | 4-1BB | 75% | 3% | 24% | 7% | |
Tis-Cell | 4-1BB | 58-77% | 22-47% | 21-40% | 12-13% | |
Ide-Cel | BCMA | 4-1BB | 84% | 5% | 18% | 3% |
Cilta-Cel | 4-1BB | 95% | 4% | 21% | 9% |
NCCN guidelines: Management of Immunotherapy related toxicities; Cancer Treatment Reviews. 2022;111:102479; Lancet. 2021;398:491-502
Bispecific T-cell Engagers | Oncologic Target | CRS | Severe CRS | ICANS | Severe ICANS |
Blinatumomab (Blincyto) | CD 19 | 15% | 5% | 65%* | 13%* |
Epcoritamab (Epkinly) | CD20 | 51% | 2.5% | 6% | 0.6% |
Glofitamab (Columvi) | 70% | 4.2% | 4.8% | 2.1% | |
Mosunetuzumab (Lunsumio) | 39% | 2.5% | 2.1% | <1% | |
Elranatamab (Elrexfio) | BCMA | 58% | 0.5% | 3.3% | |
Teclistamab (Tecvayli) | 72% | 0.6% | 6% | 0% | |
Talquetamab (Talvey) | GPRC5D | 76% | 1.5% | 9% | |
CAR T-Cell
BTCE
BTCE Dose Titrations
Blinatumomab
(Continuous IV infusion)
Epcoritamab
(Subcutaneous - LBCL)
Epcoritamab�(Subcutaneous - FL)
Glofitamab
(IV infusion)
Mosunetuzumab
(IV Infusion)
Elranatamab
(Subcutaneous)
Teclistamab
(Subcutaneous)
Talquetamab
(Subcutaneous)
* = 24 hours of hospitalization suggested
Information derived from Prescribing Information for each medication as of 12/2024
Pretreat step up doses with steroid, diphenhydramine, acetaminophen (except blinatumomab, steroid only)
Re-titration may be necessary after prolonged delay
Timing of CRS & ICANS
| CRS | CRS Incidence During Titration | ICANS | ||||||
Onset (Range) | Duration (Range) | Dose 1 | Dose 2 | Dose 3 | Dose 4 | Recurrent CRS | Onset (Range) | Duration (Range) | |
Blinatumomab | 2d | 5d | | | | | | w/in 1st 2 wks. | |
Epcoritamab (LBCL) | 24h (0-10d) | 2d (1-27d) | 9% | 16% | 61%* | 6% | 16% | 3d (1-3d) | 4d (0-8 d) |
Epcoritamab (FL) | 59h (0.1-7d) | 2d (1-14d) | 14% | 7% | 17% | 49 | 23% | 3d (0.4-7d) | 2d (1-7d) |
Glofitamab | 14h (5-74h) | 2d (1-14d) | 56%* | 35% | 29% | 2.8%^ | 34% | | |
Mosunetuzumab | 5-46h@ | 3d (1-21d) | 15% | 5% | 33% | 5% | 11% | 17d (1-48d) | 3d (1-20d) |
Elranatamab | 2d (1-9d) | 2d (1-19d) | 43%** | 19%* | 7% | 1.6%^ | 13% | 3d (1-4d) | 2d (1-18 d) |
Teclistamab | 2d (1-6d) | 2d (1-9d) | 42%** | 35%** | 24%** | <3%^ | 33% | 4d (2-8d) | 3d (1-20d) |
Talquetamab | 27h (0-7d) | 17h (0-26d) | 29%** | 44%** | 33%** | 12%! | 30% | 2.5d (1-16d) | 2d (1-22 d) |
Information derived from Prescribing Information for each medication as of 12/2024
NCCN guidelines: Management of Immunotherapy related toxicities V1.2025
^ all subsequent doses @ onset longer with progressive doses
*24 h of hospitalization recommended ! For the addtl step up dose necessary for biweekly dosing
CRS
ICANS
CAR T-cell Therapies
Bispecific T-cell Engagers
CRS and ICANS �Mitigation and Management Strategies
Epcoritamab: EPCORE NHL-1 Optimization
Epcoritamab
(Subcutaneous)
Blood. 2023;142(S1):1729
EPCORE: NHL1 Optimization Results
| Expansion Cohort N=157 | DLBCL Optimization Cohort N=36 |
CRS, % Grade 1 Grade 2 Grade 3 | 51 32 16 3 | 22 14 8 0 |
Median time to onset after first full dose, h | 20 | 27 |
Treated with tocilizumab, % | 29 | 38 |
Treated with corticosteroid, % | 21 | 25 |
Leading to treatment discontinuation, % | 1 | 0 |
Median time to resolution, d (range) | 2 (1-27) | 2.5 (1-6) |
Blood. 2023;142(S1):1729
| Pivotal Cohort N=128 | FL Optimization Cohort N=86 |
CRS, % Grade 1 Grade 2 Grade 3 | 66 40 25 2 | 49 40 9 0 |
ICANS, % | 6 | 0 |
J Clin Oncol. 2024;42(16S):7015
Diffuse Large B Cell Lymphoma
Follicular Lymphoma
Obi-Cel Split Infusion Dosing
| N=127 |
All grade CRS, % | 68.5 |
Grade 3+ CRS, % | 2.4% |
Time to CRS, d (range) | 8 (1-23) |
CRS Duration, d (range) | 5 (1-21) |
All grade ICANS, % | 22.8% |
Grade 3 + ICANS, % | 7.1% |
Time to ICANS, d (range) | 12 (1-31) |
ICANS Duration, d (range) | 8 (1-53) |
N Engl J Med 2024;391:2219-2230
NCCN Guidelines Pre/Post CAR T-Cell Monitoring
Before and During CAR T-Cell Infusion |
Baseline cardiac assessment (i.e., echocardiogram) |
Tumor lysis prophylaxis and monitoring (large tumor burden and aggressive histology) |
Seizure prophylaxis on day of infusion
|
Baseline neurologic exam
|
Baseline CRP and ferritin |
Post CAR T-Cell Infusion |
Hospitalization or extremely close outpatient monitoring |
Hospitalization at first sign of CRS or neurotoxicity |
CBC, CMP, coagulation profile daily |
CRP and serum ferritin 3x/week for 2 weeks
|
Vitals every 8 hours x 1-2 weeks |
Neurotoxicity assessment twice daily until hospital discharge and routinely every 2-4 weeks x 2 months |
Monitor for CRS, neurotoxicity, and other toxicities for at least 4 weeks (and up to 3-6 months) |
Refrain from driving/hazardous activities x 8 weeks* |
*Physician survey presented at ASH 2024 demonstrated most recommend driving restrictions for 4 weeks while 78% disagreed with driving restrictions in weeks 4-8
Blood. 2024;144(S1);3765
NCCN guidelines: Management of Immunotherapy related toxicities V1.2025
Immune Effector Toxicity Management Overview
Tocilizumab
Corticosteroids
Anakinra
Supportive Care
*Prophylactic steroids may be considered for axi cel (dexamethasone 10 mg PO daily x 3 days)
NCCN guidelines: Management of Immunotherapy related toxicities V1.2025
J Clin Oncol. 2021;39:3978-92
CAR-T Corticosteroid prophylaxis*
CAR-T Anakinra prophylaxis if high risk for CNS toxicity
Teclistamab Tocilizumab Prophylaxis
Emerging Prophylaxis Strategies
Grade 1
Grade 2
Grade 3
Grade 4
Management of CAR T-cell Induced Cytokine Release Syndrome (CRS)
Grade 1
Grade 2
Grade 3
Grade 4
Management of CAR T-cell Induced Immune Effector Cell Associated Neurotoxicity (ICANS)
NCCN Guidelines: Management of Immunotherapy Related Toxicity. V1.2025
See individual CAR T-cell agent prescribing information for agent specific CRS/ICANS management toxicity.
Tocilizumab Prophylaxis Update
| No Toci n=48 | Toci 8 mg/kg 4 h prior to 2nd step up dose n=33 |
CRS | 73% | 30% |
ICANS | 20% | 6% |
Readmissions w/in 14 d | 0% | 20% |
Toci 8 mg/kg 4 h prior to 1st step up dose n=31 | |
CRS | 13% |
ICANS | 10% |
Blood. 2023;142(S1):2008
Blood 2023;142(S1):4709
| All Patients | Teclistamab N=36 | Elranatamab N=20 | Talquetamab N=16 |
CRS | 14% | 11% | 20% | 13% |
ICANS | 8% | 8% | 0% | 19% |
Blood. 2024;144(S1):932
Siltuximab: Potential Alternative to Tocilizumab?
IL-6 binding monoclonal antibody
Slightly different mechanism than tocilizumab
No paradoxical increase in circulating IL-6 levels
Phase 2 study:
CAR T-Cell therapy with resistant Grade 1 CRS /ICANS ≥ 12 hrs. or Grade ≥ 2 CRS/ICANS
N=20
Siltuximab 11 mg/kg
One repeat dose given if persisted ≥ 12 hours
CRS
N=9
CRS/ICANS
N=10
ICANS
N=1
CRS efficacy (n=19)
ICANS efficacy (n=11)
Blood. 2024;144(S1):3449
Axi-cel, n=52, 81% with CRS (10% G3/4), 65% with ICANS (31% G3/4) Toci refractory: 15%; Steroid refractory: 33% | |
Improved CRS grade, all patients (toci refractory) | 86% (50%) |
Time to CRS resolution | 1.5 d |
Improved ICANS grade, all patients (steroid refractory) | 68% (76%) |
Time to ICANS resolution | 5d |
Blood. 2023;142(S1):4502
CAR T-cell Immune Effector Cell Associated Hemophagocytic Lymphohistiocytosis Like Syndrome (IEC-HS)
1st Line Therapy:
Anakinra ± steroids
2nd Line Therapy:
Add ruxolitinib
3rd Line Therapy:
Low dose etoposide, emapalumab
Transplant Cell Ther. 2023;29(7) 438.e1–438.e16
NCCN Guidelines: Management of Immunotherapy Related Toxicity. V1.2025
CAR T-cell Immune Effector Cell Associated Hematotoxicity (ICAHT)
Lancet Haematol 2024;11: e459–70
CAR-T Associated Coagulopathy (CARAC)
“Other” Non-ICANS Neurotoxicity
Experimental Hematology & Oncology. 2024;13:110
NCCN Guidelines: Management of Immunotherapy Related Toxicity. V1.2025
Infection Risk – Bispecific Antibodies for Multiple Myeloma
| Anti-BCMA | Anti-GPRC5D | ||
Teclistamab | Elranatamab | Talquetamab Qwk | Talquetamab Q2wk | |
Infections All Grade Grade 3/4 Grade 5 | 76.4% 44.8% 8.5% | 66.7% 35.0% 6.5% | 46.7% 6.7% -- | 38.6% 9.1% -- |
Hypogammaglobulinemia | 74.5% (<500) | 75.2% (<400) | 87% (<500) | 71% (<500) |
Blood Cancer J. 2023;13:116
Blood Cancer J. 2024;14:110
IgG levels <400 mg/dL
≥ 2 severe recurrent infections
Life-threatening infection
Documented infection with insufficient response to antibiotics
Management of BTCE CRS and ICANS
Sz prophylaxis
Grade ≥ 2: dex 10 mg IV q6h until ≤ grade 1 then taper
Grade 4: consider methylprednisolone 1g/d x 3d
D/C if grade 4 or recurrent grade3
NCCN Guidelines: Management of Immunotherapy Related Toxicity. V1.2025
Derived from Prescribing Information for each medication as of 12/2024
Conclusions
Understanding and Managing Immune Effector Cell �Toxicities in Hematologic Malignancies in 2025�
David Reeves, PharmD, BCOP
Professor of Pharmacy Practice
Butler University
Clinical Pharmacy Specialist – Hematology/Oncology
Franciscan Health Indianapolis
�
�