Neoplasia — MCQs

Neoplasia Indian Medical PG Practice Questions and MCQs

Question 441: Which of the following conditions is associated with decreased E-cadherin?

A. Invasive lobular carcinoma (Correct Answer)
B. Fibroid
C. Ductal carcinoma
D. Intestinal carcinoma

Explanation: **Explanation:** **1. Why Invasive Lobular Carcinoma (ILC) is correct:** The hallmark of Invasive Lobular Carcinoma is the **loss of E-cadherin expression**. E-cadherin is a transmembrane glycoprotein (encoded by the *CDH1* gene) responsible for calcium-dependent cell-to-cell adhesion. In ILC, a mutation or epigenetic silencing of *CDH1* leads to a complete lack of E-cadherin. This results in the characteristic **"single-file" (Indian file) pattern** of discohesive cells [1], as the cells cannot stick together to form tubules or nests. **2. Why the other options are incorrect:** * **B. Fibroid (Leiomyoma):** This is a benign smooth muscle tumor of the uterus. It does not involve the loss of E-cadherin; its pathogenesis is primarily linked to MED12 mutations and hormonal sensitivity. * **C. Ductal Carcinoma (IDC):** Unlike lobular carcinoma, Invasive Ductal Carcinoma typically **retains E-cadherin expression**. This allows the cells to adhere to one another, forming the characteristic nests, cords, and solid sheets seen on histology. * **D. Intestinal Carcinoma:** While E-cadherin loss is associated with the **Diffuse type** of Gastric Carcinoma (Linitis Plastica) [2], the **Intestinal type** usually maintains cell adhesion and forms glandular structures, making ILC the more definitive and classic answer for this question. **3. NEET-PG High-Yield Pearls:** * **E-cadherin staining** is the gold standard to differentiate between Ductal (Positive) and Lobular (Negative) breast carcinomas. * **Signet ring cells** are common in both ILC and Diffuse Gastric Cancer due to the same underlying E-cadherin deficiency [1], [2]. * **Metastatic Pattern:** ILC has a unique tendency to spread to the peritoneum, leptomeninges, and ovaries (Krukenberg tumor), unlike IDC which favors bone and lungs. * **Gene Link:** Germline mutations in *CDH1* are associated with **Hereditary Diffuse Gastric Cancer (HDGC) syndrome**, which also carries a high risk for ILC. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Liver And Biliary System Disease, pp. 454-455. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, p. 779.

Question 442: Which malignancy is associated with a cancer suppressor gene?

A. Retinoblastoma (Correct Answer)
B. Malignant melanoma
C. Liver carcinoma
D. Lung cancer

Explanation: **Explanation:** The correct answer is **Retinoblastoma (Option A)**. This malignancy is the classic prototype for the study of **Tumor Suppressor Genes (TSGs)** [1]. It is caused by a mutation in the **RB1 gene** located on chromosome **13q14** [2]. According to **Knudson’s "Two-Hit" Hypothesis**, both alleles of the RB1 gene must be inactivated for the cancer to develop [2]. In the familial form, the first "hit" is inherited (germline), and the second occurs somatically. In the sporadic form, both mutations occur somatically in the same retinal cell. The RB protein (pRb) is a key regulator of the **G1/S checkpoint** in the cell cycle; when inactivated, cells transition uncontrollably into the S-phase [4]. **Why other options are incorrect:** * **Malignant Melanoma (Option B):** While mutations in TSGs like *CDKN2A* (p16) can occur, melanoma is more strongly associated with **oncogene** mutations, specifically the **BRAF V600E** mutation [5]. * **Liver Carcinoma (Option C):** Hepatocellular carcinoma is primarily linked to chronic inflammation and viral integration (HBV/HCV) or toxins (Aflatoxin), which cause indirect DNA damage rather than being defined by a single primary TSG loss. * **Lung Cancer (Option D):** Most lung cancers (especially non-small cell) are driven by **oncogenes** like *EGFR*, *KRAS*, or *ALK* rearrangements, although *TP53* (a TSG) is frequently mutated as a secondary event [5]. **High-Yield Clinical Pearls for NEET-PG:** * **RB1** was the first tumor suppressor gene ever discovered [3]. * **"Governor of the Cell Cycle":** pRb prevents E2F transcription factors from triggering DNA replication [4]. * **Associated Malignancy:** Patients with hereditary retinoblastoma have a high risk of developing **Osteosarcoma** later in life. * **Microscopic Hallmark:** Flexner-Wintersteiner rosettes are characteristic of Retinoblastoma. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, p. 300. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 227-228. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 298-300. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 300-301. [5] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 297-298.

Question 443: What is the characteristic ultrastructural finding in a paraganglioma?

A. Dense core granules (Correct Answer)
B. Deposition of glycogen
C. Enlarged mitochondria
D. Shrunken mitochondria

Explanation: **Explanation:** **1. Why Option A is Correct:** Paragangliomas (including Pheochromocytomas) are neuroendocrine tumors derived from the extra-adrenal autonomic nervous system [1]. Their hallmark feature is the synthesis, storage, and secretion of catecholamines. On **Electron Microscopy (EM)**, these catecholamines are stored in membrane-bound, electron-dense organelles known as **Dense Core Granules** (also called neurosecretory granules). These granules typically measure 100–300 nm and often exhibit a "halo" between the dense center and the limiting membrane. **2. Why the Other Options are Incorrect:** * **Option B (Glycogen):** Excessive glycogen deposition is characteristic of tumors like Clear Cell Renal Cell Carcinoma (RCC) or Ewing Sarcoma, not neuroendocrine tumors. * **Options C & D (Mitochondrial changes):** While mitochondrial abnormalities occur in many pathologies, they are not diagnostic for paraganglioma. Specifically, "Enlarged mitochondria" (Megamitochondria) are seen in alcoholic liver disease or certain myopathies, while an abundance of mitochondria is the hallmark of **Oncocytomas**. **3. High-Yield NEET-PG Pearls:** * **Zellballen Pattern:** On light microscopy, tumor cells are arranged in characteristic nests (Zellballen) surrounded by a vascular stroma and sustentacular cells [3]. * **Immunohistochemistry (IHC):** The chief cells are positive for **Chromogranin** and **Synaptophysin**, while the peripheral sustentacular cells are positive for **S-100**. * **Rule of 10s:** Historically associated with Pheochromocytoma (10% bilateral, 10% malignant, 10% extra-adrenal), though genetic insights are evolving this rule. * **Genetic Association:** Frequently linked to mutations in the **SDH (Succinate Dehydrogenase)** gene complex [1], [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Head and Neck, pp. 748-749. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Endocrine System, p. 1137. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Liver And Biliary System Disease, pp. 419-420.

Question 444: Which of the following hereditary disorders does NOT show an abnormally high predisposition to malignancy?

A. Xeroderma pigmentosum
B. Bloom's syndrome
C. Fanconi's anaemia
D. Cystinuria (Correct Answer)

Explanation: **Explanation:** The correct answer is **Cystinuria**. This distinction relies on understanding the difference between disorders of **DNA repair/genomic instability** and disorders of **metabolic transport**. **Why Cystinuria is the correct answer:** Cystinuria is an autosomal recessive disorder characterized by a defect in the renal amino acid transporter for COAL (Cystine, Ornithine, Arginine, and Lysine) [2]. This leads to the formation of hexagonal cystine stones in the urinary tract. While it causes significant morbidity due to nephrolithiasis, it involves **no defect in DNA repair mechanisms** and therefore does not predispose the patient to malignancy [2]. **Why the other options are incorrect:** Options A, B, and C are classic examples of **Chromosomal Instability Syndromes**, which are high-yield topics for NEET-PG: * **Xeroderma Pigmentosum:** A defect in **Nucleotide Excision Repair (NER)** [1]. Patients cannot repair pyrimidine dimers caused by UV light, leading to a massive increase in skin cancers (BCC, SCC, Melanoma) [1]. * **Bloom’s Syndrome:** Caused by a mutation in the *BLM* gene (DNA Helicase) [1]. It presents with growth retardation, photosensitivity, and a high risk of various leukemias and solid tumors [1]. * **Fanconi’s Anaemia:** A defect in the repair of **DNA interstrand cross-links** [1]. It presents with bone marrow failure, radial ray defects, and a high predisposition to AML and SCC [1]. **NEET-PG High-Yield Pearls:** * **Ataxia-Telangiectasia:** Another instability syndrome (ATM gene mutation) involving defects in repairing double-stranded DNA breaks [1]. * **HNPCC (Lynch Syndrome):** Caused by defects in **Mismatch Repair (MMR)** genes (*MSH2, MLH1*), leading to microsatellite instability. * **Cystinuria Diagnosis:** Look for "hexagonal crystals" in urine and a positive Cyanide-Nitroprusside test. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 322-323. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 120-122.

Question 445: Paraganglioma is typically seen in which of the following locations?

A. Carotid body tumor
B. Thorax
C. Para-vertebral location
D. Para-aortic lymph nodes (Correct Answer)

Explanation: **Explanation:** **Paragangliomas** are rare neuroendocrine tumors arising from extra-adrenal chromaffin cells of the autonomic nervous system. While they can occur anywhere along the sympathetic or parasympathetic chains, the **para-aortic region** (specifically the **Organ of Zuckerkandl** near the origin of the inferior mesenteric artery) is the most common site for extra-adrenal sympathetic paragangliomas [1]. * **Why Option D is Correct:** The para-aortic region contains the largest collection of extra-adrenal chromaffin tissue. Tumors here are often functional (secreting catecholamines) and are classically associated with the "Rule of 10s" (though modern data suggests higher malignancy rates in extra-adrenal sites). * **Why Options A, B, and C are Incorrect:** * **Carotid body tumors (A):** These are the most common *parasympathetic* paragangliomas (usually non-functional), but they are site-specific and less frequent than the collective para-aortic group in systemic distribution [1]. * **Thorax (B) and Para-vertebral (C):** While paragangliomas can occur in the posterior mediastinum or along the sympathetic chain, these are statistically less common than the para-aortic location [1]. **High-Yield NEET-PG Pearls:** 1. **Zuckerkandl’s Organ:** The most common site for extra-adrenal paraganglioma [1]. 2. **Histology:** Characterized by **Zellballen pattern** (nests of chief cells surrounded by sustentacular cells). 3. **Staining:** Chief cells are positive for **Chromogranin/Synaptophysin**; Sustentacular cells are positive for **S-100**. 4. **Genetic Association:** Frequently associated with **SDHB, SDHD**, and **VHL** mutations [2]. SDHB mutations carry the highest risk of malignancy. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Head and Neck, pp. 748-749. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Endocrine System, p. 1137.

Question 446: Prostate specific antigen is used as?

A. Tumor marker (Correct Answer)
B. Proto oncogene
C. Oncogene
D. Bacterial antigen

Explanation: **Explanation:** **Correct Answer: A. Tumor marker** Prostate-Specific Antigen (PSA) is a glycoprotein enzyme secreted by the epithelial cells of the prostate gland. In clinical pathology, it is classified as a **tumor marker** because its serum levels are often elevated in patients with prostate cancer [1]. It is used for screening, monitoring treatment response, and detecting disease recurrence. However, it is organ-specific but not cancer-specific, as levels can also rise in benign conditions like BPH or prostatitis [1], [3]. **Why other options are incorrect:** * **B & C (Proto-oncogene/Oncogene):** These refer to genetic components. A proto-oncogene is a normal gene that regulates cell growth, which, when mutated or overexpressed, becomes an **oncogene** (e.g., *RAS*, *MYC*), leading to malignancy. PSA is a secreted protein product, not a gene involved in the transformation of cells. * **D (Bacterial antigen):** PSA is an endogenous human protein produced by the prostate; it is not derived from bacteria or any infectious agent. **High-Yield Clinical Pearls for NEET-PG:** * **Biological Function:** PSA is a serine protease that functions to liquefy the seminal coagulum. * **Normal Range:** Generally considered <4 ng/mL [2]. * **Age-Specific PSA:** PSA levels naturally rise with age due to increasing prostate volume [2]. * **Free vs. Bound PSA:** A lower percentage of **Free PSA** (<10-15%) is more suggestive of malignancy, whereas a higher percentage is seen in BPH [2]. * **Velocity & Density:** *PSA Velocity* (rate of rise over time) and *PSA Density* (PSA level divided by prostate volume) are used to increase diagnostic accuracy [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, p. 346. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lower Urinary Tract and Male Genital System, pp. 992-993. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 499-500.

Question 447: Elevated alpha-fetoprotein (AFP) levels are typically associated with which of the following conditions?

A. Hepatitis
B. Seminoma
C. Hepatocellular carcinoma (HCC) (Correct Answer)
D. All of the above

Explanation: **Explanation:** **Alpha-fetoprotein (AFP)** is a glycoprotein normally synthesized by the fetal liver and yolk sac. In adults, it serves as a critical tumor marker for specific malignancies and a marker for certain non-neoplastic liver conditions. **Why Option C is Correct:** **Hepatocellular Carcinoma (HCC)** is the most common primary malignancy of the liver. AFP levels are significantly elevated (often >400 ng/mL) in approximately 70-80% of HCC cases. Raised serum alpha-fetoprotein is a diagnostic marker, although it is not usually detectable in early or well-differentiated HCC [1]. It is used clinically for screening high-risk cirrhotic patients, diagnosis, and monitoring treatment response [1]. **Analysis of Incorrect Options:** * **Option A (Hepatitis):** While AFP can be mildly elevated in acute or chronic hepatitis due to liver regeneration, these levels are typically transient and much lower than those seen in malignancy. Therefore, it is not "typically associated" as a primary diagnostic marker for hepatitis. * **Option B (Seminoma):** This is a high-yield distinction. Pure seminomas **do not** produce AFP. If a suspected seminoma shows elevated AFP, it indicates the presence of a **Yolk Sac Tumor** component (Mixed Germ Cell Tumor). * **Option D:** Incorrect because AFP is not a diagnostic marker for seminoma. **NEET-PG High-Yield Pearls:** 1. **Yolk Sac Tumor (Endodermal Sinus Tumor):** AFP is the definitive marker; look for **Schiller-Duval bodies** on histology. 2. **Neural Tube Defects (NTD):** Elevated AFP in maternal serum or amniotic fluid indicates NTDs (e.g., Anencephaly, Spina Bifida). 3. **Down Syndrome:** Associated with **decreased** maternal serum AFP. 4. **Rule of Thumb:** In testicular tumors, elevated **hCG** is seen in Choriocarcinoma/Seminoma, but elevated **AFP** always points to Yolk Sac elements. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Liver And Biliary System Disease, pp. 399-400.

Question 448: Rosettes are not seen in which of the following conditions?

A. Retinoblastoma
B. Medulloblastoma
C. Primitive neuroectodermal tumor (PNET)
D. Neurocysticercosis (Correct Answer)

Explanation: **Explanation:** The presence of **rosettes** (circular arrangements of cells) is a classic histopathological hallmark of various neuroectodermal and embryonal tumors. **Why Neurocysticercosis is the correct answer:** Neurocysticercosis is an **infectious parasitic disease** caused by the larval stage of *Taenia solium* [4]. Histologically, it is characterized by a cystic cavity containing the invaginated scolex (with hooks and suckers), a bladder wall with three distinct layers, and surrounding host inflammatory response (gliosis and fibrosis) [4], [5]. It does **not** involve the neoplastic proliferation of cells into rosette patterns. **Analysis of Incorrect Options:** * **Retinoblastoma:** Characterized by **Flexner-Wintersteiner rosettes** (true rosettes with a single layer of tumor cells around an apparent lumen), which are highly specific for retinal differentiation [1]. **Homer Wright rosettes** may also be seen. * **Medulloblastoma:** Classically shows **Homer Wright rosettes** (pseudorosettes with a central fibrillar core instead of a lumen). These are a key diagnostic feature of this cerebellar tumor [3]. * **Primitive Neuroectodermal Tumor (PNET):** Now largely reclassified under the umbrella of Ewing sarcoma family of tumors or specific CNS embryonal tumors, PNETs characteristically exhibit **Homer Wright rosettes**, reflecting their primitive neural origin. **High-Yield Clinical Pearls for NEET-PG:** 1. **Flexner-Wintersteiner Rosettes:** Seen in Retinoblastoma and Pineoblastoma (True rosettes with a clear central lumen) [1]. 2. **Homer Wright Rosettes:** Seen in Neuroblastoma, Medulloblastoma, and PNET (Pseudorosettes with a central tangle of nerve fibers/neuropil) [3]. 3. **Perivascular Pseudorosettes:** Cells arranged around a blood vessel; classic for **Ependymoma** [2]. 4. **Psammoma Bodies:** If the question asks about "calcified laminated bodies" instead of rosettes, think Meningioma or Papillary Thyroid Carcinoma. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Eye, p. 1342. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, pp. 1312-1313. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, pp. 1314-1315. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Infectious Diseases, p. 404. [5] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, pp. 1274-1275.

Question 449: Which proto-oncogene is associated with Burkitt's lymphoma?

A. C-MYC (Correct Answer)
B. N-MYC
C. L-MYC
D. RET

Explanation: **Explanation:** **1. Why C-MYC is Correct:** Burkitt’s lymphoma is a highly aggressive B-cell non-Hodgkin lymphoma characterized by the translocation of the **C-MYC** [1] proto-oncogene (located on chromosome 8). The most common translocation is **t(8;14)** [1], where C-MYC is moved adjacent to the **Immunoglobulin Heavy Chain (IgH)** gene promoter on chromosome 14. This leads to the constitutive over-expression of the MYC protein, a potent transcription factor that promotes rapid cell cycle progression and cell growth [1]. **2. Analysis of Incorrect Options:** * **B. N-MYC:** This oncogene is primarily associated with **Neuroblastoma** (often via gene amplification) and small cell carcinoma of the lung. * **C. L-MYC:** This is specifically associated with **Lung cancer** (Small cell lung carcinoma). * **D. RET:** This is a receptor tyrosine kinase associated with **MEN 2A and 2B** syndromes, Medullary thyroid carcinoma, and Papillary thyroid carcinoma (RET/PTC rearrangement). **3. High-Yield Clinical Pearls for NEET-PG:** * **Cytogenetics:** Besides t(8;14), other variants include t(2;8) [kappa light chain] and t(22;8) [lambda light chain] [1]. * **Morphology:** Characterized by a **"Starry-sky appearance"** (tingible body macrophages acting as "stars" against a background of dark neoplastic B-cells). * **EBV Association:** Strongly linked to the African (Endemic) variant, typically presenting as a jaw mass. * **Immunophenotype:** CD19+, CD20+, CD10+, and **BCL-6+**. Crucially, it is **BCL-2 negative** (unlike follicular lymphoma). * **Proliferation Index:** Shows a Ki-67 fraction of nearly 100%. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 324-325.

Question 450: Increased susceptibility to breast cancer is likely to be associated with a mutation in which of the following genes?

A. P53 (Correct Answer)
B. BRCA-1
C. Retinoblastoma (Rb)
D. H-Ras

Explanation: **Explanation:** **Why P53 is the correct answer:** The **TP53** gene, located on chromosome 17p13.1, is the most commonly mutated gene in human cancers [3]. It encodes the p53 protein, known as the "Guardian of the Genome," which regulates the cell cycle, DNA repair, and apoptosis [2], [3]. Germline mutations in *TP53* result in **Li-Fraumeni Syndrome**, a rare autosomal dominant disorder characterized by a high predisposition to a wide spectrum of tumors. **Breast cancer** is the most common malignancy associated with Li-Fraumeni Syndrome, often occurring at a young age [3]. While BRCA-1 is a major risk factor, P53 mutations represent a fundamental mechanism of genomic instability leading to breast carcinoma [1]. **Analysis of Incorrect Options:** * **BRCA-1:** While BRCA-1 is famously associated with hereditary breast and ovarian cancer, it is primarily involved in DNA double-strand break repair [4]. In the context of many standardized exams, if both are present, P53 is often highlighted due to its broader role in Li-Fraumeni and its status as the most frequent genetic alteration in human oncology. * **Retinoblastoma (Rb):** The *RB1* gene (chromosome 13q14) is the "Governor of the Cell Cycle." Mutations primarily predispose individuals to retinoblastoma and osteosarcoma, not typically breast cancer [3]. * **H-Ras:** This is a proto-oncogene involved in signal transduction. Mutations in the *RAS* family (K-Ras, N-Ras, H-Ras) are common in pancreatic, colon, and bladder cancers, but are not a primary driver for hereditary breast cancer susceptibility. **High-Yield Clinical Pearls for NEET-PG:** * **Li-Fraumeni Syndrome:** Remember the "SBLA" mnemonic (Sarcoma, Breast, Leukemia, Adrenal gland tumors). * **P53 Function:** It triggers **p21** (a CDK inhibitor) to cause G1-S arrest, allowing time for DNA repair [3]. * **Molecular Subtype:** TP53 mutations are most frequently found in **Triple-Negative (Basal-like)** breast cancers. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 226-227. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 303-304. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 227-228. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Breast, p. 1058.

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