Episode 400: Pharmacology 101: Radioimmunoconjugates

"Radioimmunoconjugates work through a dual mechanism that combines immunologic targeting with localized radiation delivery. The monoclonal antibody components bind to specific tumor-associated antigens such as CD20, expressed on malignant B cells. Once found, the attached radioisotope delivers beta radiation directly to the tumor, causing DNA damage and cell death," Sabrina Enoch, MSN, RN, OCN®, CNMT, NMTCB (CT), theranostics clinical specialist at Highlands Oncology in Rogers, AR, told Jaime Weimer, MSN, RN, AGCNS-BS, AOCNS®, manager of oncology nursing practice at ONS, during a conversation about radioimmunoconjugates. Music Credit: "Fireflies and Stardust" by Kevin MacLeod Licensed under Creative Commons by Attribution 3.0 Earn 0.25 contact hours of nursing continuing professional development (NCPD) by listening to the full recording and completing an evaluation at courses.ons.org by January 30, 2027. The planners and faculty for this episode have no relevant financial relationships with ineligible companies to disclose. ONS is accredited as a provider of nursing continuing professional development by the American Nurses Credentialing Center's Commission on Accreditation. Learning outcome: Learners will report an increase in knowledge in the history of, the mechanism of action of, and the use of radioimmunoconjugates in the treatment of cancer. Episode Notes Complete this evaluation for free NCPD.ONS Podcast™ episodes: Pharmacology 101 series Episode 377: Creating and Implementing Radiopharmaceutical Policies and Procedures Episode 301: Radiation Oncology: Side Effect and Care Coordination Best Practices Episode 298: Radiation Oncology: Nursing's Essential Roles ONS Voice articles: Interprofessional Collaboration Reduces Time to Neutropenia Antibiotic Administration Radiopharmaceuticals and Theranostics Offer New Options for Oncology Nurses to Transform Cancer Care Radiopharmaceuticals Pack a One-Two Punch Against Cancer Safety Is Key in Use of Radiopharmaceuticals Telehealth Has Value During Radiotherapy, Patients Say ONS Voice oncology drug reference sheets: Lutetium Lu 177 dotatate Lutetium Lu 177 vipivotide tetraxetan Radium 223 dichloride Sodium iodide-131 Strontium chloride Sr-89 ONS books: Chemotherapy and Immunotherapy Guidelines and Recommendations for Practice (second edition) Manual for Radiation Oncology Nursing Practice and Education (fifth edition) ONS courses: ONS/ONCC® Chemotherapy Immunotherapy Certificate™ ONS/ONCC® Radiation Therapy Certificate™ Clinical Journal of Oncology Nursing articles: Radiopharmaceutical Safety: Making It Easy Targeted Radionuclide Therapy: A Theranostic Approach to Cancer Therapy ONS Huddle Cards: Radiobiology Radiopharmaceuticals ONS Learning Libraries: Immuno-OncologyRadiation ONS Symptom Interventions for Prevention of BleedingDrugs@FDA package inserts To discuss the information in this episode with other oncology nurses, visit the ONS Communities. To find resources for creating an ONS Podcast club in your chapter or nursing community, visit the ONS Podcast Library. To provide feedback or otherwise reach ONS about the podcast, email [e-mail]. Highlights From This Episode "Radioimmunoconjugates are a specialized subset of radiopharmaceuticals designed to combine the specificity of monoclonal antibodies with the cytotoxic power of radiation. ... Early development focused on B-cell malignancies, particularly non-Hodgkin lymphoma." TS 1:51 "An important concept for nurses to understand is the crossfire effect, where radiation can affect nearby tumor cells, even though not every cell expressed has the target antigen. This helps explain why these agents can be effective even in heterogeneous tumors." TS 3:40 "At present, 90 Y-ibritumomab tiuxetan is the only radioimmunoconjugate approved by the U.S. Food and Drug Administration (FDA) in clinical use. Historically, iodine-131 tositumomab played a major role in establishing these therapy classes, but it's also useful to contrast radioimmunoconjugates with other radiopharmaceuticals, such as iodine-131 therapies, which a lot of places do at this time, used for thyroid diseases, or radium 223, used for metastatic prostate cancer. Unlike those agents, radioimmunoconjugates rely on antibody-mediated targeted rather than physiologic uptake or bone affinity." TS 4:55 "I just try to explain to [patients] that radiation exposure is like being next to a flame. The further you are away, the less heat you get, the less exposure you get. These patients can be radioactive for three days, seven days—it just depends on how fast they excrete it through their bodies with half-life exposure." TS 9:33 "While only one agent is currently approved, the principles established by radioimmunoconjugates continue to guide development for newer targeted radiopharmaceuticals. Emerging agents aim to improve targeting, reduce toxicity, and expand indications beyond hematologic malignancies. This ...