CA-125 monitoring in gynecologic cancer patients with COVID-19: A case series.

CA-125 has long been utilized as a surveillance biomarker for gynecologic malignancies but can be elevated in other conditions, including infection. A study of tumor markers in non-cancer patients saw a rise in CA-125 values during severe COVID-19 infections. Given the potential confounding effect this could have on surveillance and treatment planning, we sought to describe the impact of COVID-19 on CA-125 trends in a gynecologic oncology patient population. We conducted a retrospective chart review of patients treated at a UPMC hospital during the COVID-19 pandemic from March of 2020 through September of 2021. Patients were included for analysis if they had confirmed uterine or ovarian malignancies, a COVID-19 infection and more than one CA-125 value drawn within one year of their COVID-19 diagnosis. The CA-125 values were plotted against the timeline of their COVID-19 infections to assess for trends in CA-125 during and after infection. There were 17 patients who met the above criteria. Of these 17 patients, three had a rise in their CA-125 trend at the time of their COVID-19 diagnosis. Another three had newly elevated CA-125 values, without a prior documented baseline level, at the time of their infection. In all six of these patients, their CA-125 elevations could be attributed to malignancy. The remaining 11 patients showed stable or decreasing CA-125 values coinciding with their COVID-19 infection. This case series illustrates that while CA-125 values may increase during an acute COVID-19 infection, cancer remains the most likely cause of a CA-125 increase. Clinical suspicion should remain high for a possible change in cancer status.