Quiz: Understanding Tumor Development and Management — 10 perguntas

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

A. Benign tumors are hypervascularized, whereas malignant tumors are not.

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

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

D. Benign tumors are invasive, whereas malignant tumors are localized.

Answer: (C)

Explicação

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.

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

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

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

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

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

Answer: (A)

Explicação

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

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

A. Metastasis

B. Progression

C. Promotion

D. Initiation

Answer: (C)

Explicação

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.

4. Which gene mutation process is involved in carcinogenesis?

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

B. Deactivating all proto-oncogenes and activating anti-oncogenes.

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

D. Mutations only occur in environmental factors and not in genes.

Answer: (A)

Explicação

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

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

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

B. It causes tumor cells to differentiate.

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

D. It prevents the tumor from invading surrounding tissues.

Answer: (A)

Explicação

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.

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

A. Prostate-specific antigen (PSA)

B. Hemoglobin A1c

C. Blood urea nitrogen (BUN)

D. Cholesterol levels

Answer: (A)

Explicação

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.

7. What is the sequence of tumor progression?

A. Hyperplasia → Dysplasia → In situ → Invasive → Metastasis

B. Hyperplasia → Invasive → Dysplasia → In situ → Metastasis

C. Dysplasia → Hyperplasia → In situ → Metastasis → Invasive

D. In situ → Hyperplasia → Dysplasia → Metastasis → Invasive

Answer: (A)

Explicação

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

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

A. Angiogenesis

B. Metastasis

C. Dysplasia

D. Fibrosis

Answer: (A)

Explicação

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

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

A. X-ray, CT, MRI, scintigraphy

B. Electroencephalogram (EEG)

C. Electromyography (EMG)

D. Ultrasound only

Answer: (A)

Explicação

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.

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

A. Poor differentiation and nuclear atypia

B. Well-differentiated cells with regular nuclei

C. Absence of mitotic figures

D. Smooth, regular contours with no invasion

Answer: (A)

Explicação

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