Episode 427: Pharmacology 101: Resistance Pathways

"A good way of thinking about this is this is the survival of the fittest clone. There could be a portion of a cancer that naturally has some resistance or ability to survive a particular drug. And over time, as the other cells around it are dying off, that particular clone is able to replicate and continue to survive in the face of that drug therapy and eventually take over as being the fittest clone. At that point, we're often seeing disease progression," Danielle Roman, PharmD, BCOP, manager of clinical pharmacy services at the Allegheny Health Network Cancer Institute in Pittsburgh, PA, told Jaime Weimer, MSN, RN, AGCNS-BS, AOCNS®, manager of oncology nursing practice at ONS, during a conversation about resistance pathways.

Music Credit: "Fireflies and Stardust" by Kevin MacLeod

Licensed under Creative Commons by Attribution 3.0

Earn 0.5 contact hours of nursing continuing professional development (NCPD), including 30 minutes of pharmacotherapeutic content, by listening to the full recording and completing an evaluation at courses.ons.org by August 7, 2027. Roman has served on advisory boards for Genetech, Pfizer, Regeneron, and Daiichi Sankyo and received honoraria payments from Pharmacy Times and Decera for faculty lectures. These financial relationships have been mitigated. 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 increased knowledge related to resistance pathways in oncology care.

Episode Notes  Complete this evaluation for free NCPD.  ONS Podcast™ episodes: Pharmacology 101 series Episode 423: Pharmacology 101: Interaction Pathways Episode 406: Drug Resistance Biomarkers and Their Impact on Cancer Treatment Choices ONS Voice articles: Predictive and Diagnostic Biomarkers Scientists Identify Protein Implicated in Tumor Growth, Treatment Resistance ONS book: Guide to Cancer Immunotherapy (second edition) Genomics and Precision Oncology Learning Library ONS Biomarker Database Pharmacogenomics Huddle Card CancerQuest: Cancer Drug Resistance National Comprehensive Cancer Network OncoKB.org Research To Practice 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 pubONSVoice@ons.org.

Highlights From This Episode "As we look at drug resistance, this is the concept that cancer cells are no longer able to respond to a cancer treatment. The downstream of this is that we could end up with progression of the disease and need to look at alternative therapies that may be beneficial for the patient. This is unfortunately a very common phenomenon. Drug resistance is a major cause of treatment failure and poor patient outcomes with treatments. Unfortunately, this is an issue we see that increases over time on treatment." TS 2:29

"Genetics play a really big role in drug resistance. We know that drug resistance can be due to different things. It could be epigenetics. It could be the tumor microenvironment factors. But genetics often play a very big role in resistance pathways. It's generally considered to be a critical contributor to resistance, particularly in the way of acquired variants to drug targets or amplifications of certain oncogenes that can lead cancers to have progression. A well-known genetic alteration is the BRCA1/BRCA2 variant that helps to make the cancer more efficient at fixing DNA damage. So we're trying to get DNA damage with chemotherapy, and this particular variant helps at fixing that damage to allow the cancer to progress. So that is one genetic variant we see that plays a big role in a number of different cancers." TS 4:51

"These pathways are not mutually exclusive. Oftentimes we have multiple resistance pathways involv