Our Pipeline

Our Pipeline

About the Y-mAbs development pipeline of therapies

Y-mAbs Therapeutics has an expanding portfolio that features accelerated FDA approval for naxitamab and pivotal-stage investigational omburtamab. Both were granted breakthrough therapy designation to expedite their development and review.

The safety and efficacy of the investigational products have not been established by health authorities, or approved for use in the United States or globally.

Broad and Advanced Clinical Product Development Program

Therapeutic Area
Phase 1
Phase 2
Phase 3/Pivotal Study
Submitted for approval
Next Anticipated Milestone
Relapsed/Refractory High-Risk Neuroblastoma (Pediatric/Adult)
2020-FDA ApprovedOngoing pivotal Phase 2 trial
Relapsed/Refractory High-Risk Neuroblastoma (Pediatric)
Ongoing Phase 2 trial
Front-Line High-Risk Neuroblastoma (Pediatric)
Ongoing Phase 2 trial
Relapsed Second-Line Osteosarcoma
Ongoing Phase 2 trial
Chemoimmunotherapy for Relapsed/Refractory High-Risk Neuroblastoma
Ongoing Phase 2 trial
CNS/Leptomeningeal Metastases from Neuroblastoma (Pediatric) (131I)
Ongoing pivotal Phase 2 trial
2021-BLA Submission
Intrathecal Immunotherapy for CNS/Leptomeningeal Metastases (131I)
Ongoing Phase 1 trial
Diffuse Intrinsic Pontine Glioma (Pediatric) (124I)
Ongoing Phase 1 trial
Desmoplastic Small Round Cell Tumor (Pediatric) (131I)
Ongoing Phase 2 trial
Medulloblastoma (Pediatric) (177Lu)
Ongoing Phase 1 trial
B7-H3 Positive CNS/LM tumors (177Lu)
Ongoing Phase 1 trial
Refractory GD2-Positive Solid Tumors
Ongoing Phase 1 trial
Small Cell Lung Cancer
Ongoing Phase 2 trial
GD2-GD3 Vaccine
High-Risk Neuroblastoma Patients in Remission
A MSKCC IND product.
Ongoing Phase 2 trial

Preclinical and Research Pipeline

Product Candidate
Anticipated Treatment
Next Anticipated Milestone
Product Candidate: GD2-SADA
Target: GD2
Indication/Treatment: GD2 Positive solid tumors
Next Anticipated Milestone: IND 2021
Product Candidate: huCD33-BsAb
Target: CD33xCD3
Indication/Treatment: Hematological Cancers Expressing CD33
Next Anticipated Milestone: IND filed in 2021


This antibody—radiolabeled monoclonal antibody 8H9 (131I-8H9)—is being developed to target B7-H3–expressing cells in human solid tumors, including embryonal tumors, carcinomas, sarcomas, and brain tumors. In vitro/ex vivo modeling has shown omburtamab binds to an FG loop-dependent conformation on the B7-H3 molecule, a domain critical for its biologic function.

Omburtamab is a promising investigational agent for radioimmunotherapy of leptomeningeal metastases, Diffuse Intrinsic Pontine Glioma (DIPG), and malignant ascites.


Neuroectoderm-derived tumors, sarcomas, and embryonal tumors are difficult to cure when they have metastasized. These cancers include neuroblastoma, retinoblastoma, melanoma, small cell lung cancer, brain tumors, osteosarcoma, rhabdomyosarcoma, Ewing’s sarcoma, liposarcoma, fibrosarcoma, leiomyosarcoma, and other soft-tissue sarcomas in adults. One of the common tumor antigens on the cell surface of all of these tumors is called disialoganglioside or GD2. Numerous research laboratories have recently discovered that, in addition, surface GD2 is present on breast cancer stem cells, neuroectodermal, and mesenchymal stem cells.

Our humanized monoclonal antibody has been granted Orphan Drug Designation (ODD) and Rare Pediatric Disease Designation (RPDD).

GD2-GD3 Vaccine

Neuroectoderm-derived tumors, including neuroblastoma and sarcomas, have high expression of tumor antigens GD2 and GD3. Our investigational bivalent GD2-GD3 vaccine is being studied by scientists at MSKCC for the immunization of high-risk neuroblastoma patients previously treated with naxitamab. The vaccine, in combination with adjuvants, is being studied to induce patients to produce their own anti-GD2 and anti-GD3 serum titers, with the goal of preventing subsequent relapse. Our investigational GD2-GD3 vaccine is currently in an ongoing Phase II study at MSKCC.


To further build upon our investigational anti-GD2 immunotherapy, scientists at MSKCC are studying a GD2 x CD3 bispecific antibody (nivatrotamab), with the goal of bringing highly potent T cells to directly kill GD2-expressing tumor cells. Nivatrotamab is the first T-cell–engaging antibody utilizing the BiClone format to enter human clinical trials. The BiClone format utilizes an IgG-scFv format to maximize tumor binding and T-cell recruitment and minimize risk of non-specific T-cell engagement. In pre-clinical studies, nivatrotamab demonstrated >1000-fold greater potency than conventional anti-GD2 IgG antibodies. Our investigational nivatrotamab is currently in a Phase I/II study at MSKCC.