Tumor Antigens and Immune Response

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Questions and Answers

What is the term used to define the process by which tumors change their antigen expression in response to immune pressure?

  • Antigen suppression
  • Immune editing (correct)
  • Tumor promotion
  • Tumor elimination

Which immune cells play a crucial role in tumor cell killing due to their ability to recognize and eliminate abnormal cells?

  • T cells
  • Natural killer cells (correct)
  • B cells
  • Phagocytes

What is the term for the phenomenon where tumors evade natural killer cell cytotoxicity by downregulating the expression of activating ligands?

  • Ligand masking (correct)
  • Antigen suppression
  • Immune escape
  • NK cell inhibition

Which type of antigen is uniquely expressed by tumor cells and can serve as a target for immunotherapy?

<p>Tumor-specific antigen (C)</p> Signup and view all the answers

How do tumors evade dendritic cell-mediated activation of T cells by impairing the function of these immune cells?

<p>Downregulating MHC I expression (B)</p> Signup and view all the answers

What was the significance of Allison's discovery in 1992 regarding co-stimulation through B7-CD28?

<p>It highlighted the importance of co-stimulation in enhancing T cell responses. (D)</p> Signup and view all the answers

Which antibody is known as anti-CTLA-4 and received FDA approval for advanced melanoma?

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

What is the key characteristic of Tumor Specific Antigens (TSA) that influences the prognosis of tumors expressing them?

<p>They generate altered self-peptides in tumor cells. (B)</p> Signup and view all the answers

What is a critical requirement for immune cells to be effective against cancer cells?

<p>Recognition of cancer cells as different from normal cells. (C)</p> Signup and view all the answers

What was the significant achievement that led to Allison being awarded the Nobel Prize in 2018?

<p>Stimulation of immunity against cancer through immune checkpoint inhibition. (A)</p> Signup and view all the answers

What is one consequence of the specificity of immune responses in tumor immunity?

<p>Selective elimination of tumor cell clones with low MHC class I expression (D)</p> Signup and view all the answers

Which of the following cytokines can be produced by tumors to generate a hostile environment against immune responses?

<p>Tumor Growth Factor-alpha (TGF-α) (C)</p> Signup and view all the answers

How do cancer cells evade detection by cytotoxic T lymphocytes (CTLs) in some cases?

<p>By reducing MHC class I surface expression (A)</p> Signup and view all the answers

What is one role of dendritic cells in tumor immunity?

<p>Capture of tumor antigens for presentation to T cells (B)</p> Signup and view all the answers

Which mechanism can tumors use to evade natural killer (NK) cell lysis?

<p>Downregulating MHC class I surface expression (C)</p> Signup and view all the answers

What is the function of antibodies in tumor immunity known as?

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

How do tumors edit themselves to promote their own survival?

<p>By expressing low MHC I and low levels of tumor antigens (C)</p> Signup and view all the answers

In what scenario are cancer cells detectable by natural killer (NK) cells?

<p>When they exhibit low or negative MHC class I surface expression (D)</p> Signup and view all the answers

"Oncofetal antigens" are recognized in cancer cells as:

<p>&quot;Non-self&quot; (B)</p> Signup and view all the answers

"Immunosurveillance by NK cells" is prevented when:

<p>&quot;Engagement with inhibitory receptors&quot; (A)</p> Signup and view all the answers

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