Cancer marker Tumor M2-PK (in stool)

Tumor Marker Tumor M2-PK (Stool Test): Diagnosis of Gastrointestinal Disorders

The Tumor M2-PK (M2 pyruvate kinase) tumor marker is an enzyme whose elevated concentration in stool may be associated with gastrointestinal tumors, particularly colorectal cancer. This test is a non-invasive diagnostic method used to detect potential pathological changes in the gastrointestinal tract.

What is Tumor M2-PK?

Tumor M2-PK is a specific isoform of pyruvate kinase that plays an important role in cellular metabolism. In order to grow and proliferate rapidly, tumor cells alter their metabolism, and Tumor M2-PK plays a key role in this process. An elevated concentration of Tumor M2-PK in stool indicates increased metabolic activity of tumor cells within the gastrointestinal tract.

Why is the Tumor M2-PK (Stool) Test Performed?

This test is most commonly performed for the following purposes:

• Screening: for individuals at increased risk of colorectal cancer, or as an additional test when other screening methods (e.g., a fecal occult blood test) are negative but symptoms persist.
• Investigation of suspected gastrointestinal tumors: when symptoms such as unexplained abdominal pain, gastrointestinal bleeding, weight loss, anemia, or changes in bowel habits are present.
• Monitoring patients after treatment for gastrointestinal tumors: to help detect potential disease recurrence at an early stage.
• Differentiation from other gastrointestinal diseases: elevated Tumor M2-PK levels may also be associated with inflammatory bowel diseases (e.g., Crohn’s disease or ulcerative colitis); however, significantly higher levels are more commonly linked to tumors.

Procedure at the Clinic

The Tumor M2-PK test is performed using a stool sample.

• Sample collection: the patient collects a small stool sample in a special sterile container according to the provided instructions.
• Preparation for the test: this test generally does not require any special preparation, such as dietary restrictions. However, it is always recommended to consult a healthcare professional regarding specific instructions.

The sample is then sent to a laboratory for analysis.

Interpretation of Results

The test results indicate the concentration of Tumor M2-PK in the stool.

• Elevated Tumor M2-PK concentration may indicate the presence of gastrointestinal tumors or inflammatory bowel disease.
• Normal Tumor M2-PK concentration generally suggests a lower likelihood of neoplastic processes.

It is important to emphasize that a positive Tumor M2-PK test result is not a definitive diagnosis of cancer. Rather, it indicates the need for further diagnostic evaluation, such as colonoscopy or other imaging studies, to establish an accurate diagnosis. Test results should always be interpreted by a qualified healthcare professional in the context of the patient's symptoms, medical history, and other diagnostic findings.