Which tumor marker is used to monitor recurrence of pancreatic carcinoma?

Enhance your readiness for the Physician Assistant Clinical Knowledge Rating and Assessment Tool (PACKRAT) 4 Exam. Utilize our flashcards and multiple-choice questions, complete with hints and explanations, to ace your upcoming test!

Multiple Choice

Which tumor marker is used to monitor recurrence of pancreatic carcinoma?

Explanation:
CA 19-9 is used to monitor recurrence of pancreatic carcinoma. It’s a marker that tends to track tumor burden in many patients with pancreatic cancer, so serial levels help gauge response to treatment and flag relapse when they rise after a period of stability or decline. A falling CA 19-9 after therapy can indicate a favorable response, while a rising level can prompt further imaging and investigation for recurrence. However, it isn’t perfect: some people don’t produce CA 19-9 at all due to Lewis antigen negativity, and biliary obstruction or cholestasis can falsely elevate it. Other markers like AFP are associated with liver/germ cell tumors, CEA is more typical for colorectal and some GI cancers, and CA-125 is linked to ovarian cancer, which is why CA 19-9 is the marker most specifically used for monitoring pancreatic cancer recurrence.

CA 19-9 is used to monitor recurrence of pancreatic carcinoma. It’s a marker that tends to track tumor burden in many patients with pancreatic cancer, so serial levels help gauge response to treatment and flag relapse when they rise after a period of stability or decline. A falling CA 19-9 after therapy can indicate a favorable response, while a rising level can prompt further imaging and investigation for recurrence. However, it isn’t perfect: some people don’t produce CA 19-9 at all due to Lewis antigen negativity, and biliary obstruction or cholestasis can falsely elevate it. Other markers like AFP are associated with liver/germ cell tumors, CEA is more typical for colorectal and some GI cancers, and CA-125 is linked to ovarian cancer, which is why CA 19-9 is the marker most specifically used for monitoring pancreatic cancer recurrence.

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