QCM : Understanding Tumor Development and Management — 10 questions

Question 1

1. What is a key difference between benign and malignant tumors in terms of their macroscopic features?

Benign tumors are hypervascularized, whereas malignant tumors are not.

Benign tumors have irregular contours, while malignant tumors have regular contours.

Benign tumors have regular contours and normal cells, while malignant tumors have irregular contours and abnormal cells.

Benign tumors are invasive, whereas malignant tumors are localized.

Explication

Benign tumors typically have a regular contour and consist of normal, well-differentiated cells, making them localized and non-invasive. In contrast, malignant tumors often have irregular contours, contain abnormal, undifferentiated cells, and are invasive.

Answer

Benign tumors have regular contours and normal cells, while malignant tumors have irregular contours and abnormal cells.

Question 2

2. What is a key difference between benign and malignant tumors in terms of growth pattern?

Benign tumors are localized and well-defined, while malignant tumors are invasive and infiltrative.

Benign tumors are invasive, but malignant tumors are always localized.

Benign tumors frequently metastasize early, whereas malignant tumors do not.

Benign tumors grow very rapidly, unlike malignant tumors which grow slowly.

Explication

Benign tumors are typically localized and have well-defined borders, whereas malignant tumors tend to invade neighboring tissues, making them infiltrative.

Answer

Benign tumors are localized and well-defined, while malignant tumors are invasive and infiltrative.

Question 3

3. Which stage in carcinogenesis involves hyperplasia of mutated cells without morphological abnormalities?

Metastasis

Progression

Promotion

Initiation

Explication

Promotion is the stage where mutated cells undergo hyperplasia, meaning increased cell proliferation, but still retain a normal appearance. It follows initiation and precedes progression, where morphological abnormalities like dysplasia occur.

Answer

Activating proto-oncogenes into oncogenes and inactivating anti-oncogenes like p53.

Answer

It supplies blood to the tumor, supporting its growth and enabling metastasis.

Answer

Prostate-specific antigen (PSA)

Answer

Hyperplasia → Dysplasia → In situ → Invasive → Metastasis

Answer

Angiogenesis

Answer

X-ray, CT, MRI, scintigraphy

Answer

Poor differentiation and nuclear atypia

Question 4

4. Which gene mutation process is involved in carcinogenesis?

Activating proto-oncogenes into oncogenes and inactivating anti-oncogenes like p53.

Deactivating all proto-oncogenes and activating anti-oncogenes.

Mutating only the tumor suppressor genes without affecting proto-oncogenes.

Mutations only occur in environmental factors and not in genes.

Explication

Carcinogenesis involves activating proto-oncogenes into oncogenes that promote cell division, and inactivating anti-oncogenes such as p53, which normally inhibit uncontrolled growth.

Question 5

5. What is the primary role of angiogenesis in tumor development?

It supplies blood to the tumor, supporting its growth and enabling metastasis.

It causes tumor cells to differentiate.

It reduces the tumor's ability to grow by limiting blood supply.

It prevents the tumor from invading surrounding tissues.

Explication

Angiogenesis is the process of new blood vessel formation, which supplies oxygen and nutrients to the tumor, facilitating its growth and the potential for invasion and metastasis.

Question 6

6. Which of the following is a common tumor marker detectable in blood?

Prostate-specific antigen (PSA)

Hemoglobin A1c

Blood urea nitrogen (BUN)

Cholesterol levels

Explication

PSA is a well-known tumor marker for prostate cancer, aiding in detection and monitoring, unlike the other options which are unrelated to tumor identification.

Question 7

7. What is the sequence of tumor progression?

Hyperplasia → Dysplasia → In situ → Invasive → Metastasis

Hyperplasia → Invasive → Dysplasia → In situ → Metastasis

Dysplasia → Hyperplasia → In situ → Metastasis → Invasive

In situ → Hyperplasia → Dysplasia → Metastasis → Invasive

Explication

The typical progression starts with hyperplasia, then dysplasia, followed by carcinoma in situ, invasion, and finally metastasis.

Question 8

8. Which process supplies nutrients to the tumor and enables its growth and dissemination?

Angiogenesis

Metastasis

Dysplasia

Fibrosis

Explication

Angiogenesis is the formation of new blood vessels, which supplies oxygen and nutrients to the tumor, facilitating its growth and potential spread.

Question 9

9. Which imaging modality is commonly used to reveal tumor size and location?

X-ray, CT, MRI, scintigraphy

Electroencephalogram (EEG)

Electromyography (EMG)

Ultrasound only

Explication

Imaging modalities such as X-ray, CT, MRI, and scintigraphy are key tools in visualizing tumor size and location, essential for diagnosis and treatment planning.

Question 10

10. What feature characterizes a malignant tumor on histopathological examination?

Poor differentiation and nuclear atypia

Well-differentiated cells with regular nuclei

Absence of mitotic figures

Smooth, regular contours with no invasion

Explication

Malignant tumors usually show poor differentiation and nuclear atypia, reflecting abnormal, aggressive cell behavior; well-differentiated tumors tend to be benign.

QCM : Understanding Tumor Development and Management — 10 questions

Questions et réponses du QCM

1. What is a key difference between benign and malignant tumors in terms of their macroscopic features?

2. What is a key difference between benign and malignant tumors in terms of growth pattern?

3. Which stage in carcinogenesis involves hyperplasia of mutated cells without morphological abnormalities?

4. Which gene mutation process is involved in carcinogenesis?

5. What is the primary role of angiogenesis in tumor development?

6. Which of the following is a common tumor marker detectable in blood?

7. What is the sequence of tumor progression?

8. Which process supplies nutrients to the tumor and enables its growth and dissemination?

9. Which imaging modality is commonly used to reveal tumor size and location?

10. What feature characterizes a malignant tumor on histopathological examination?

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