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Pediatric Hematology Oncology: Outpatient Naxitamab Protocols
INDICATION DANYELZA is indicated, in combination with granulocyte-macrophage colony-stimulating factor (GM-CSF), for the treatment of pediatric patients 1 year of age and older and adult patients with relapsed or refractory high-risk neuroblastoma in the bone or bone marrow who have demonstrated a partiaI response, minor response, or stable disease to prior therapy.
This indication is approved under accelerated approval based on overalI response rate and duration of response. Continued approval for this indication may be contingent upon verification and description of clinical benefit in a confirmatory trial(s).

Outpatient Naxitamab Administration: Protocols From Leading Pediatric Centers

​Outpatient naxitamab administration has become the operational standard across pediatric hematology-oncology centers that deliver DANYELZA for on-label indications. More than 90 percent of infusions in the Study 201 pre-specified interim analysis occurred in the outpatient setting. The shift reflects both the safety profile and the institutional readiness developed across 60-plus US treating centers.

Successful outpatient delivery depends on premedication protocols, pain management, reaction monitoring, and coordinated scheduling across the treatment team. Each element supports patient tolerance and cycle throughput at the institutional level across the recommended treatment course. Protocol design across pediatric hematology-oncology institutions reflects the same core requirements, adapted to local operational realities.

What Does Outpatient Naxitamab Administration Involve?

Outpatient naxitamab administration follows the approved on-label protocol at 3 mg/kg per infusion. Infusions occur on Days 1, 3, and 5 of each 28-day cycle across the treatment course. More than 90 percent of Study 201 pre-specified interim analysis infusions occurred in the outpatient setting.

​Premedication Protocols That Support Outpatient Naxitamab Delivery

Premedication protocols anchor outpatient DANYELZA delivery across pediatric hematology-oncology centers for on-label indications. Each infusion requires an antihistamine, an H2 antagonist, acetaminophen, and an antiemetic administered within a defined pre-infusion window. IV corticosteroids precede the first infusion of each cycle to reduce reaction severity across the treated population.

Multimodal pain management combines opioids, ketamine, and gabapentin to address the distinct pain mechanisms of anti-GD2 therapy. Opioid analgesia begins 60 to 45 minutes before each infusion to address expected pain during antibody engagement. Ketamine is given alongside opioids in the same pre-infusion window for pain not fully controlled by opioid analgesia alone.

Timing across the pre-infusion window matters as much as agent selection for consistent patient tolerance across cycles. Coordination between pharmacy, nursing, and physician teams supports reliable execution at the treating institution. Standing orders capture the multimodal sequence for repeatable delivery across staff shifts.

A 12-day gabapentin course spans Day -4 through Day 7 of each cycle to round out the multimodal approach. Institutional protocols align the gabapentin start with GM-CSF initiation for streamlined patient education across the family. Consistent scheduling supports adherence and reduces pain-related treatment interruptions across the multi-day cycle rhythm.

Premedication documentation travels with the patient across cycles as part of the institutional treatment record. Complete records support both individual patient management and consistent delivery across the team. Institutional readiness for premedication logistics enables the outpatient shift observed across the treated population today.

Pain and Reaction Management Across the Naxitamab Infusion Cycle

Pain and infusion-related reaction management define the operational reality of DANYELZA delivery in the outpatient setting. Both categories occur at high frequency across the treated population and reflect the mechanism of anti-GD2 therapy. Institutional protocols in pediatric hematology-oncology programs address expected events proactively rather than reactively across cycles.

Nursing staff trained in GD2-directed antibody delivery monitor patients throughout each infusion and observation period. Observation continues for at least two hours after each infusion to support safe discharge from the setting. Institutional readiness for reaction management remains central to the outpatient shift observed across US treating centers today.

Documentation of each reaction supports individual patient management and institutional protocol refinement across cycles. Consistent records feed both the confirmatory evidence base and cycle-to-cycle patient care planning.

Coordinated Scheduling Across Pediatric Hematology-Oncology Teams

Coordinated scheduling across pediatric hematology-oncology teams supports reliable naxitamab delivery in the outpatient setting. Days 1, 3, and 5 of each 28-day cycle require synchronized pharmacy, nursing, and physician availability. Additional coordination covers GM-CSF administration on Days -4 through 5 of each cycle across the schedule.

GM-CSF is administered subcutaneously at 250 mcg per m² per day on Days -4 through 0 of each cycle. The schedule shifts to 500 mcg per m² per day on Days 1 through 5 alongside DANYELZA infusions. Pharmacy workflows account for both agents together to prevent scheduling gaps at the treating center.

Family communication about the multi-day schedule supports adherence and reduces missed infusion days across cycles. Clear expectations at cycle start reduce day-of-infusion complications across the treated pediatric population overall.

Institutional scheduling templates capture the full cycle rhythm from Day -4 GM-CSF through observation on Day 5. Templates travel across the care team as the operational anchor for each cycle across the treatment course.

Consistent execution across the multi-day protocol supports both patient outcomes and institutional throughput. Institutions delivering DANYELZA build repeatable workflows that flex with clinic capacity across the treatment course. Coordination remains the operational thread linking premedication, infusion, and observation across each cycle.

Building Institutional Readiness for Naxitamab in Pediatric Hematology-Oncology

Building institutional readiness for DANYELZA delivery in pediatric hematology-oncology programs requires clinical, operational, and educational alignment. Programs supporting outpatient administration develop premedication protocols, reaction management pathways, and staff training programs across cycles. Each element supports safe delivery across the treated population and consistent throughput at the treating center.

Trovillion 2024 demonstrated on-label outpatient administration efficiency at Atrium Health Levine across a series of treated patients. The dataset supports the operational feasibility of outpatient delivery in a leading pediatric center for anti-GD2 therapy. According to Trovillion 2024, outpatient administration remained consistent across the reported experience within the on-label indication.

Staff education covers premedication timing, reaction recognition, pain management, and post-infusion observation across the treatment cycle. Ongoing training supports consistent delivery across staff turnover and clinical workflow refinement over time.

Institutional pharmacy readiness supports both DANYELZA and GM-CSF workflows across each 28-day cycle across the treatment course. Coordinated ordering and preparation reduce day-of-infusion delays across the schedule for both agents together. Established relationships across pharmacy, nursing, and physician teams anchor reliable execution at the treating center.

Family education runs alongside staff readiness across the treatment course from cycle one through completion. Clear expectations at cycle start support both adherence and satisfaction across the multi-day cycle rhythm.

Partner With SERB to Support Your Outpatient Naxitamab Program

Outpatient naxitamab administration reflects both the safety profile and institutional readiness developed across US pediatric hematology-oncology centers. Premedication, pain management, reaction monitoring, and coordinated scheduling together enable consistent delivery across cycles. Each element contributes to the operational reality of DANYELZA delivery at the treating institution today.

Institutional readiness for outpatient administration supports both patient tolerance and cycle throughput across the treatment course. Consistent protocols reduce day-of-infusion delays and support family adherence across the multi-day schedule. Reach out to SERB for clinical resources that support your outpatient naxitamab program across your center.

Sources

  1. Trovillion EM, et al. Outpatient Administration of Naxitamab for High-Risk Neuroblastoma at Atrium Health Levine Children's. 2024.

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CR=complete response; MIBG=meta-iodobenzylguanidine.

References: 1. Park JR, Bagatell R, Cohn SL, et al. J Clin Oncol. 2017;35(22):2580-2587. 2. DuBois SG, Kalika Y, Lukens JN, et al. J Pediatr Hematol Oncol. 1999;21(3):181-189.
3. Garaventa A, Poetschger U,Valteau-Couanet D, et al. J Clin Oncol. 2021;39(23):2552-2563. 4. Pinto N, Naranjo A, Hibbitts E, et al. Eur J Cancer. 2019;112:66-79. 5. Yanik GA, Parisi MT, Naranjo A, et al. J Nucl Med. 2018;59:502-508. 6. Yanik GA, Parisi MT, Shulkin BL, et al. J Nucl Med. 2013;54(4):541-548. 7. Streby KA, Parisi MT, Shulkin BL, et al. Pediatr Blood Cancer. 2023;70(8):e30418.

References: 1. DANYELZA® [package insert]. New York, NY: Y-mAbs Therapeutics, Inc.; 2024. 2. Data on file. Y-mAbs Therapeutics, Inc.

References: 1. Data on file. Y-mAbs Therapeutics, Inc. 2. DANYELZA® [package insert]. New York, NY: Y-mAbs Therapeutics, Inc.; 2024.

Reference: 1. Data on file. Y-mAbs Therapeutics, Inc.

References: 1. DANYELZA® [package insert]. New York, NY: Y-mAbs Therapeutics, Inc.; 2024. 2. Data on file. Y-mAbs Therapeutics, Inc. 3. NIH US National Library of Medicine. https://clinicaltrials.gov/ct2/ show/NCT01419834?term=NCT01419834&draw=2&rank=1. Accessed April 22, 2024.

References: 1. DANYELZA® [package insert]. New York, NY: Y-mAbs Therapeutics, Inc.; 2024. 2. Data on file. Y-mAbs Therapeutics, Inc.

References: 1. Yanik GA, Parisi MT, Shulkin BL, et al. J Nucl Med. 2013;54(4):541-548. 2. Yanik GA, Parisi MT, Naranjo A, et al. J Nucl Med. 2018;59:502-508. 3. Streby KA, Parisi MT, Shulkin BL, et al. Pediatr Blood Cancer. 2023;e30418. https://doi.org/10.1002/pbc.30418. 4. DANYELZA® [package insert]. New York, NY: Y-mAbs Therapeutics, Inc; 2024.

References: 1. DANYELZA® [package insert]. New York, NY: Y-mAbs Therapeutics, Inc.; 2024. 2. Lisby S, Liebenberg N, Bukrinski J, et al. Presented at the SIOP virtual congress. Abstract #945. October 16, 2020. 3. Cheung N-KV, Guo H, Hu J, et al. Oncoimmunology. 2012;1(4):477-486.

References: 1. Data on file. Y-mAbs Therapeutics, Inc. 2. DANYELZA® [package insert]. New York, NY: Y-mAbs Therapeutics, Inc.; 2024.

References: 1. DANYELZA® [package insert]. New York, NY: Y-mAbs Therapeutics, Inc.; 2024. 2. Data on file. Y-mAbs Therapeutics, Inc.

References: 1. DANYELZA® [package insert]. New York, NY: Y-mAbs Therapeutics, Inc.; 2024. 2. Data on file. Y-mAbs Therapeutics, Inc.

IMPORTANT SAFETY INFORMATION and INDICATION

WARNING: SERIOUS INFUSION-RELATED REACTIONS and NEUROTOXICITY

Serious Infusion-Related Reactions

  • DANYELZA can cause serious infusion reactions, including cardiac arrest, anaphylaxis, hypotension, bronchospasm, and stridor. lnfusion reactions of any Grade occurred in 94-100% of patients. Severe infusion reactions occurred in 32-68% and serious infusion reactions occurred in 4-18% of patients in DANYELZA clinical studies.
  • Premedicate prior to each DANYELZA infusion as recommended and monitor patients for at least 2 hours following completion of each infusion. Reduce the rate, interrupt infusion, or permanently discontinue DANYELZA based on severity.
  • Neurotoxicity

  • DANYELZA can cause severe neurotoxicity, including severe neuropathic pain, transverse myelitis and reversible posterior leukoencephalopathy syndrome (RPLS). Pain of any Grade occurred in 94-100% of patients in DANYELZA clinical studies.
  • Premedicate to treat neuropathic pain as recommended. Permanently discontinue DANYELZA based on the adverse reaction and severity.
CONTRAINDICATION

DANYELZA is contraindicated in patients with a history of severe hypersensitivity reaction to naxitamab-gqgk. Reactions have included anaphylaxis.

WARNINGS AND PRECAUTIONS
Serious Infusion-Related Reactions

DANYELZA can cause serious infusion reactions requiring urgent intervention including fluid resuscitation, administration of bronchodilators and corticosteroids, intensive care unit admission, infusion rate reduction or interruption of DANYELZA infusion. Infusion-related reactions included hypotension, bronchospasm, hypoxia, and stridor.

Serious infusion-related reactions occurred in 4% of patients in Study 201 and in 18% of patients in Study 12-230. Infusion-related reactions of any Grade occurred in 100% of patients in Study 201 and 94% of patients in Study 12-230. Hypotension of any grade occurred in 100% of patients in Study 201 and 89% of patients in Study 12-230.

In Study 201, 68% of patients experienced Grade 3 or 4 infusion reactions; and in Study 12-230, 32% of patients experienced Grade 3 or 4 infusion reactions. Anaphylaxis occurred in 12% of patients and two patients (8%) permanently discontinued DANYELZA due to anaphylaxis in Study 201. One patient in Study 12-230 (1.4%) experienced a Grade 4 cardiac arrest 1.5 hours following completion of DANYELZA infusion.

In Study 201, infusion reactions generally occurred within 24 hours of completing a DANYELZA infusion, most often within 30 minutes of initiation. Infusion reactions were most frequent during the first infusion of DANYELZA in each cycle. Eighty percent of patients required reduction in infusion rate and 80% of patients had an infusion interrupted for at least one infusion-related reaction.

Caution is advised in patients with pre-existing cardiac disease, as this may exacerbate the risk of severe hypotension.

Premedicate with an antihistamine, acetaminophen, an H2 antagonist and corticosteroid as recommended. Monitor patients closely for signs and symptoms of infusion reactions during and for at least 2 hours following completion of each DANYELZA infusion in a setting where cardiopulmonary resuscitation medication and equipment are available.

Reduce the rate, interrupt infusion, or permanently discontinue DANYELZA based on severity and institute appropriate medical management as needed.

Neurotoxicity

DANYELZA can cause severe neurotoxicity, including severe neuropathic pain, transverse myelitis, and reversible posterior leukoencephalopathy syndrome.

Pain
Pain, including abdominal pain, bone pain, neck pain, and extremity pain, occurred in 100% of patients in Study 201 and 94% of patients in Study 12-230. Grade 3 pain occurred in 72% of patients in Study 201. One patient in Study 201 (4%) required interruption of an infusion due to pain. Pain typically began during the infusion of DANYELZA and lasted a median of less than one day in Study 201 (range less than one day and up to 62 days).

Premedicate with drugs that treat neuropathic pain (e.g., gabapentin) and oral opioids. Administer intravenous opioids as needed for breakthrough pain. Permanently discontinue DANYELZA based on severity.

Transverse Myelitis
Transverse myelitis has occurred with DANYELZA. Permanently discontinue DANYELZA in patients who develop transverse myelitis.

Reversible Posterior Leukoencephalopathy Syndrome (RPLS)
Reversible posterior leukoencephalopathy syndrome (RPLS) (also known as posterior reversible encephalopathy syndrome or PRES) occurred in 2 (2.8%) patients in Study 12-230. Events occurred 2 and 7 days following completion of the first cycle of DANYELZA. Monitor blood pressure during and following DANYELZA infusion and assess for neurologic symptoms. Permanently discontinue DANYELZA in case of symptomatic RPLS.

Peripheral Neuropathy
Peripheral neuropathy, including peripheral sensory neuropathy, peripheral motor neuropathy, paresthesia, and neuralgia, occurred in 32% of patients in Study 201 and in 25% of patients in Study 12-230. Most signs and symptoms of neuropathy began on the day of the infusion and neuropathy lasted a median of 5.5 days (range 0 to 22 days) in Study 201 and 0 days (range 0 to 22 days) in Study 12-230.

Permanently discontinue DANYELZA based on severity.

Neurological Disorders of the Eye
Neurological disorders of the eye including unequal pupils, blurred vision, accommodation disorder, mydriasis, visual impairment, and photophobia occurred in 24% of patients in Study 201 and 19% of patients in Study 12-230. Neurological disorders of the eye lasted a median of 17 days (range 0 to 84 days) in Study 201 with two patients (8%) experiencing an event that had not resolved at the time of data cutoff, and a median of 1 day (range less than one day to 21 days) in Study 12-230. Permanently discontinue DANYELZA based on severity.

Prolonged Urinary Retention
Urinary retention occurred in 1 (4%) patient in Study 201 and in 3 patients (4%) in Study 12-230. All events in both studies occurred on the day of an infusion of DANYELZA and lasted between 0 and 24 days. Permanently discontinue DANYELZA in patients with urinary retention that does not resolve following discontinuation of opioids.

Myocarditis

Myocarditis has occurred in adolescent patients receiving DANYELZA in clinical trials and expanded access programs. Myocarditis occurred within days of receiving DANYELZA requiring drug interruption. Monitor for signs and symptoms of myocarditis during treatment with DANYELZA. Withhold, reduce the dose, or permanently discontinue DANYELZA based on severity.

Hypertension

Hypertension occurred in 44% of patients in Study 201 and 28% of patients in Study 12-230 who received DANYELZA. Grade 3 or 4 hypertension occurred in 4% of patients in Study 201 and 7% of patients in Study 12-230. Four patients (6%) in Study 12-230 permanently discontinued DANYELZA due to hypertension. In both studies, most events occurred on the day of DANYELZA infusion and occurred up to 9 days following an infusion of DANYELZA.

Do not initiate DANYELZA in patients with uncontrolled hypertension. Monitor blood pressure during infusion, and at least daily on Days 1 to 8 of each cycle of DANYELZA and evaluate for complications of hypertension including RPLS. Interrupt DANYELZA infusion and resume at a reduced rate, or permanently discontinue DANYELZA based on the severity.

Orthostatic Hypotension

Orthostatic hypotension has occurred in patients receiving DANYELZA in clinical trials and expanded access programs. Severe orthostatic hypotension, including cases requiring hospitalization, have occurred. Cases occurred within hours to 6 days of DANYELZA infusions in any cycle.

In patients with symptoms of orthostatic hypotension, monitor postural blood pressure prior to initiating treatment with DANYELZA and as clinically indicated with subsequent dosing. Withhold, reduce dose, or permanently discontinue DANYELZA based on severity.

Embryo-Fetal Toxicity

Based on its mechanism of action, DANYELZA may cause fetal harm when administered to a pregnant woman. Advise females of reproductive potential, including pregnant women, of the potential risk to a fetus. Advise females of reproductive potential to use effective contraceptive during treatment with DANYELZA and for two months after the last dose.

ADVERSE REACTIONS

The most common adverse reactions in Studies 201 and 12-230 (≥25% in either study) were infusion-related reaction, pain, tachycardia, vomiting, cough, nausea, diarrhea, decreased appetite, hypertension, fatigue, erythema multiforme, peripheral neuropathy, urticaria, pyrexia, headache, injection site reaction, edema, anxiety, localized edema and irritability. The most common Grade 3 or 4 laboratory abnormalities (≥5% in either study) were decreased lymphocytes, decreased neutrophils, decreased hemoglobin, decreased platelet count, decreased potassium, increased alanine aminotransferase, decreased glucose, decreased calcium, decreased albumin, decreased sodium and decreased phosphate.

INDICATION

DANYELZA is indicated, in combination with granulocyte-macrophage colony-stimulating factor (GM-CSF), for the treatment of pediatric patients 1 year of age and older and adult patients with relapsed or refractory high-risk neuroblastoma in the bone or bone marrow who have demonstrated a partial response, minor response, or stable disease to prior therapy.This indication is approved under accelerated approval based on overall response rate and duration of response. Continued approval for this indication may be contingent upon verification and description of clinical benefit in a confirmatory trial(s).

Please see full Prescribing Information and Patient Information for DANYELZA including Boxed Warning on serious infusion-related reactions and neurotoxicity.

References: 1. DANYELZA® [package insert]. New York, NY: Y-mAbs Therapeutics, Inc.; 2024.
2. Data on file. Y-mAbs Therapeutics, Inc.

References: 1. Data on file. Y-mAbs Therapeutics, Inc. 2. DANYELZA® [package insert]. New York, NY: Y-mAbs Therapeutics, Inc.; 2024. Available online at https://labeling.ymabs.com/danyelza. 3. Smith V, Foster J. High-risk neuroblastoma treatment review. Children (Basel). 2018;5(9):114. 4. Ahmed A, Zhang L, Reddivalla N, Hetherington M. Neuroblastoma in children: update on clinicopathologic and genetic prognostic factors. Pediatr Hematol Oncol. 2017;34(3):165-185. 5. London W, Castel V, Monclair T, et al. Clinical and biologic features predictive of survival after relapse of neuroblastoma: a report from International Neuroblastoma Risk Group project. J Clin Oncol. 2011;29(24):3286-3292.

References: 1. DANYELZA® [package insert]. New York, NY: Y-mAbs Therapeutics, Inc.; 2024. Available online at https://labeling.ymabs.com/danyelza. 2. National Cancer Institute. Published November 27, 2017. Accessed May 17, 2021. Common Terminology Criteria for Adverse Events (CTCAE) Version 5.0. https://ctep.cancer.gov/protocolDevelopment/electronic_applications/docs/CTCAE_v5_Quick_Reference_8.5x11.pdf

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