Which of these statements about cancer is incorrect ?

Options

A. Cellular oncogenes ( c - onc ) are present in normal cells which have not become cancerous
B. Antibodies against cancer- specific antigens are used for detecting of certain cancers
C. MRI used strong magnetic field and ionizing radiations to accurately detect pathological and physiological change in the living tissue
D. Cancers can be treated using alpha interferon which activities immune system and help in destroying tumor cells .

Answer

To determine which statement about cancer is incorrect, let's analyze each option provided in the question step by step.

### Step 1: Analyze the First Statement
**Statement:** Cellular oncogenes are present in normal cells which have not been cancerous.

**Analysis:** This statement is correct. Cellular oncogenes, which are mutated forms of proto-oncogenes, can exist in normal cells. They play a role in regulating cell growth and division. When these genes undergo mutations, they can lead to uncontrolled cell proliferation, resulting in cancer.

### Step 2: Analyze the Second Statement
**Statement:** Antibodies against cancer-specific antigens are used for detecting certain antigens.

**Analysis:** This statement is also correct. Antibodies that target specific antigens associated with cancer cells are indeed used in diagnostic tests to detect the presence of cancer. This method helps in identifying cancerous cells based on their unique markers.

### Step 3: Analyze the Third Statement
**Statement:** MRI uses strong magnetic fields and ionizing radiation to accurately detect pathological physiological changes in living tissue.

**Analysis:** This statement is incorrect. MRI (Magnetic Resonance Imaging) utilizes strong magnetic fields and radio waves to create images of organs and tissues inside the body. It does not use ionizing radiation, which is a characteristic of X-rays and CT scans. Therefore, this statement is misleading and incorrect.

### Step 4: Analyze the Fourth Statement
**Statement:** Cancers can be treated using alpha interferons, which activate the immune system and help in destroying tumor cells.

**Analysis:** This statement is correct. Alpha interferons are a type of cytokine that can enhance the immune response against cancer cells. They are used in certain cancer treatments to help the immune system recognize and destroy tumor cells.

### Conclusion
After analyzing all the statements, the incorrect statement is the third one regarding MRI.

### Final Answer
The incorrect statement about cancer is: **MRI uses strong magnetic fields and ionizing radiation to accurately detect pathological physiological changes in living tissue.**

---