Daniel Catenacci, MD, examines factors that help decide when to switch treatment from first to second line, and when to change mechanism of action in treating gastric carcinoma.
Daniel Catenacci, MD: The change to second-line therapy is an important one, and it’s one that’s often discussed because only around 40% to 50% of all patients actually get second-line therapy in the databases in this country, and also globally in large studies. Part of that is due to the aggressiveness of the disease no doubt, where patients are getting treated, and even if they have a response, they can get rapid progression and decline quite rapidly. Even when you’re paying attention, you can miss your window of switching to next-line therapy.
I strategize when the patient is first diagnosed and profile the patient’s tumor, so that you know what you’re going to do in each line of therapy and plan it out. As a standard of care, what are the sequences that you’re going to use? We always tell the patients as well of course that there are a number of factors that go into what’s going to trigger a change to next-line therapy. Those include how you’re feeling and how you’re doing. And if there’s truly a toxicity that we just cannot manage, and/or there’s progression of the cancer in that setting, then clearly you would switch to another line of therapy.
In addition to how one’s feeling from a cancer-related standpoint, and symptom-wise, and also tolerability, we are always closely tracking tumor markers. We followed CEA [carcinoembryonic antigen] and the CA [cancer antigen] 19-9 tumor markers. They often are what’s going up earliest, and heralding a progression even before you see it on scans or with patients’ symptoms. And that’s preparing us to not do another scan 3 months later, because that’s when you’re going to miss your chance and miss your opportunity to switch. There you would be doing no more than a 2-month scan, and sometimes there I’ll do a 6-week scan after 3 cycles of a FOLFOX [folinic acid, fluorouracil, oxaliplatin]-based therapy to not miss your chance.
Of course, we look at CT scans, but many times patients have peritoneal disease that’s difficult to follow on scans. And it’s more of a sense of how a patient is doing, how the tumor markers are doing, and evaluating that in the absence of many changes on the CT scan, so that you don’t miss your chance to change to the next active therapy.
Transcript edited for clarity.
Case: A 71-Year-Old Man With HER2+ Gastric Cancer
Initial Presentation
Clinical Workup
Treatment
PD-L1 Provides Valid Biomarker for Nivolumab/Chemo in Gastric Cancer
February 28th 2024In a discussion with Targeted Oncology, Michael Gibson, MD, PhD, discusses the benefits of using a patient’s PD-L1 combined positive score to determine if they are given nivolumab and chemotherapy to treat their gastric cancer.
Read More
Optimal Results: Neoadjuvant Durvalumab and Chemotherapy Drive Improvement in Gastric/GEJ Cancers
January 19th 2024The combination of neoadjuvant FLOT with durvalumab demonstrated enhanced pathological complete response compared to sole chemotherapy in individuals with resectable gastric and GEJ cancers, regardless of geographical location.
Read More
FDA Issues Complete Response Letter to Zolbetuximab BLA in GI Cancer
January 9th 2024The FDA has issued a complete response letter to the biologics license application of zolbetuximab for patients with advanced, HER2-negative, claudin 18.2-positive gastric or gastoesophageal junction adenocarcinoma.
Read More
FDA Approves Pembrolizumab/Chemo for Gastric and GEJ Adenocarcinoma
November 16th 2023Pembrolizumab and fluoropyrimidine- and platinum-containing chemotherapy are now FDA-approved for the treatment of patients with locally advanced unresectable or metastatic gastric or gastroesophageal junction adenocarcinoma.
Read More