Neuroectodermal Tumors
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Questions and Answers

What is a characteristic of melanomas that indicates they are about to metastasize?

  • Differentiation into mature melanocytes
  • Horizontal movement towards the epithelium
  • Vertical movement towards the stroma (correct)
  • Increased proliferation rate

What is the term for the process by which cells lose their tissue-specific characteristics?

  • Metaplasia
  • Hyperplasia
  • Trans-differentiation
  • Dedifferentiation (correct)

What type of tumors arise from cells that form various components of the central and peripheral nervous system?

  • Neuroendocrine tumors
  • Neuroepithelial tumors
  • Neuromuscular tumors
  • Neuroectodermal tumors (correct)

What term describes the transformation of one adult cell type to another?

<p>Trans-differentiation (A)</p> Signup and view all the answers

What is the term for cancer with minimal deviation from normal tissues, but cell layer replacement is observed?

<p>Metaplasia (D)</p> Signup and view all the answers

What is a characteristic of small-cell lung carcinomas?

<p>They contain cells related to neurosecretory cells (D)</p> Signup and view all the answers

Which type of cancer has substantial potential to invade underlying tissues?

<p>Neoplastic (B)</p> Signup and view all the answers

What type of tumor does not fit neatly into one of the four large groups?

<p>Melanomas (C)</p> Signup and view all the answers

What is the term for cancer in which the growth is deviated just minimally from normal tissue, but may contain an excessive number of cells?

<p>Hyperplastic (C)</p> Signup and view all the answers

What is the term for an abnormal increase in the number of cells in a tissue or organ?

<p>Hyperplasia (C)</p> Signup and view all the answers

What is the characteristic of Dysplastic cancer cells?

<p>All of the above (D)</p> Signup and view all the answers

What is the term for a disorder of cell growth and differentiation, leading to abnormal tissue structure and function?

<p>Dysplasia (A)</p> Signup and view all the answers

What is the term for the transition zone where one type of epithelium meets another type of epithelium?

<p>Epithelial transition zone (A)</p> Signup and view all the answers

At which stage of cancer development does cell layer replacement occur?

<p>Metaplastic stage (B)</p> Signup and view all the answers

What is the term for cancer that has not invaded underlying tissues?

<p>Dysplastic (D)</p> Signup and view all the answers

What is the term for the process of cancer development from normal to severe aggressive cancer?

<p>Cancer progression (A)</p> Signup and view all the answers

What is the primary characteristic of metastatic cancer?

<p>It is capable of seeding new tumor colonies (A)</p> Signup and view all the answers

What is metaplasia?

<p>A change from one type of epithelium to another (A)</p> Signup and view all the answers

Which of the following is NOT a factor that affects cancer formation?

<p>Exercise (C)</p> Signup and view all the answers

What was the significance of Katsusaburo Yamagiwa's discovery in 1915?

<p>He showed that exposure to chemicals in coal tar can induce tumor formation (C)</p> Signup and view all the answers

What is the primary mechanism by which carcinogens act on cells?

<p>They act as mutagens (B)</p> Signup and view all the answers

What is the term for the abnormal growth of cells that is not yet cancerous?

<p>Dysplasia (C)</p> Signup and view all the answers

What is the term for an increase in the number of cells in a tissue?

<p>Hyperplasia (C)</p> Signup and view all the answers

What is the term for the process by which normal cells become cancerous?

<p>Neoplasia (D)</p> Signup and view all the answers

Study Notes

Neuroectodermal Tumors

  • Arise from cells that form various components of the central and peripheral nervous system
  • Examples: Gliomas, Glioblastomas, Neuroblastomas, Schwannomas, and Medulloblastomas

Medulloblastoma

  • A type of neuroectodermal tumor

Tumors That Don't Fit into Major Classifications

  • Melanomas: derived from melanocytes, arise from embryonic neural crest cells
  • Small-cell lung carcinomas (SCLCs): contain cells related to neurosecretory cells
  • Anaplastic tumors: shed tissue-specific characteristics, making it difficult to identify the tissue of origin

Cancer Development

  • Complex and multi-step process
  • Gradual difference in tumor development from normal to aggressive cancer
  • Each type of growth represents a distinct step in cancer development

Phases of Cancer Development

  • 4 steps:
    • Hyperplastic: excessive number of cells, minimal deviation from normal tissue
    • Metaplasia: cell layer replacement, usually observed in epithelial transition zones
    • Dysplastic: cytologically abnormal cells, no invasion to underlying tissue
    • Neoplastic: malignant tumors with potential to invade underlying tissues
    • Metastatic: cancer capable of seeding new tumor colonies

Factors Affecting Cancer Formation

  • Heredity: cancer-susceptibility alleles at different frequencies (e.g. BRCA1, BRCA2 mutations)
  • Environment: air, food, water, lifestyle, dietary choices, and tobacco usage contribute to disease incidence rate

Environmental Factors and Cancer Development

  • Initial observations:
    • 1761: first report connecting nasal cancer and tobacco snuff
    • Later: lung cancer documented at high rate with people working in silver mines
    • Exposure to X-ray associated with lung cancer
    • 1950: evidence for direct link between heavy cigarette smoking and lung cancer

Carcinogens

  • Chemicals that can induce tumor formation (e.g. coal tar)
  • Divided into three categories:
    • Chemical
    • Physical
    • Viral

Carcinogens Act as Mutagens

  • 1927: Hermann Muller discovered that x-ray can induce DNA mutation in Drosophila
  • Chemical carcinogens can also induce genomic mutations
  • Speculation that cancer is a disease of mutant genes started to be initiated

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Description

This quiz covers the different types of neuroectodermal tumors, including gliomas, glioblastomas, neuroblastomas, schwannomas, and medulloblastomas.

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