All are recognized tumor markers except ?

Chitranjjan National Cancer Institute Kolkata - 2021

Pathology & Genetics

Medium

Appeared in: Chitranjjan National Cancer Institute Kolkata - 2021

Explanation

Acid phosphatase, specifically Prostatic Acid Phosphatase (PAP), is considered an outdated tumor marker.
It was historically used for diagnosing and monitoring prostate cancer.
Modern clinical practice has largely replaced it with Prostate-Specific Antigen (PSA), which offers superior sensitivity and specificity.
While some textbooks may list it for completeness, it is not a standard, first-line marker used today, making it the correct exception.

Option A: Beta Human Chorionic Gonadotropin (Beta HCG) is a well-established tumor marker.
Option B: Beta-2-microglobulin (B2M) is a recognized tumor marker used in clinical practice.
Option C: Alpha-fetoprotein (AFP) is a key oncofetal antigen used as a tumor marker.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Identification of clinically relevant tumor markers and their associated malignancies as background academic context rather than a clinical decision trigger.
A nurse must understand that no tumor marker is 100% specific or sensitive; they are tools for monitoring, not standalone diagnostic tests. Results must be correlated with clinical findings and imaging.
Patient education is crucial. Nurses should explain that elevated markers can occur in non-cancerous conditions and that the trend over time (serial measurements) is often more important than a single reading.
When a patient has a test for Beta HCG or AFP, it is important for the nurse to be aware of the possibility of pregnancy, as these markers are also elevated in normal gestation.

How to Approach the Question

First, understand the question's negative framing: it asks for the 'except', meaning you need to find the option that is NOT a recognized tumor marker.
Review each option and recall its association with cancer. Think: 'Is Beta HCG a tumor marker? Yes. Is B2M a tumor marker? Yes. Is AFP a tumor marker? Yes. Is Acid Phosphatase a tumor marker?'
The key is to differentiate between currently used, standard markers and those that are historical or outdated. All options have been linked to cancer at some point.
Recall or deduce that AFP, Beta-HCG, and B2M are all standard markers in current use for specific cancers.
Identify Acid Phosphatase as the one that has been largely replaced in clinical practice by a better test (PSA), making it the best answer for the 'exception' in a modern context.

Concept Tested & Keywords

Concept Tested: Identification of clinically relevant tumor markers and their associated malignancies.
Stem keywords: tumor markers, recognized
Lead-in keywords: except
Negative lead-in flag: EXCEPT

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