Which of the following method is used for early diagnosis of carcinoma stomach?
**Core Concept**
The early diagnosis of carcinoma stomach relies on detecting specific biomarkers in the blood or tissue that are associated with gastric cancer. This involves identifying proteins or genetic mutations that are uniquely present in cancer cells.
**Why the Correct Answer is Right**
The correct answer involves the use of Carcinoembryonic Antigen (CEA) as a tumor marker for gastric cancer. CEA is a protein that is normally present during fetal development but is usually undetectable in adults. However, in patients with gastric cancer, CEA levels can rise due to the production of this protein by cancer cells. This elevation in CEA levels can be detected through blood tests, allowing for early diagnosis and monitoring of the disease. The use of CEA as a tumor marker is particularly relevant in gastric cancer, as it can help identify patients who are at higher risk of recurrence or metastasis.
**Why Each Wrong Option is Incorrect**
* **Option A:** Although imaging studies like CT scans and MRI can help diagnose gastric cancer, they are not specific for early diagnosis and may not detect the disease until it has progressed.
* **Option B:** Endoscopy is a valuable tool for visualizing the stomach and detecting early signs of cancer, but it requires a skilled operator and may not be as sensitive as biomarker testing for early detection.
* **Option D:** Gastric biopsy is essential for confirming the diagnosis of gastric cancer, but it is an invasive procedure that may not be suitable for early diagnosis in asymptomatic patients.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that CEA levels can be elevated in various other conditions, including colorectal cancer, lung cancer, and pancreatitis. Therefore, a positive CEA test result should be interpreted in the context of the patient's clinical presentation and other diagnostic findings.
**Correct Answer:** C. Carcinoembryonic Antigen (CEA)