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Related Concept Videos

Tumor Immunotherapy01:27

Tumor Immunotherapy

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Immunotherapy is a treatment that boosts or manipulates the immune system to fight diseases, including cancer. For instance, by stimulating an immune response through vaccinations against viruses that cause cancers, like hepatitis B virus and human papillomavirus, these diseases can be prevented. Nonetheless, some cancer cells can avoid the immune system due to their rapid mutation and division. The immune response to many cancers involves three phases: elimination, equilibrium, and escape.
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Cancer treatment vaccines are a rapidly evolving field that offers a promising approach to immunotherapy. Unlike traditional vaccines that prevent diseases, cancer treatment vaccines are designed to treat existing cancers by stimulating the immune system to recognize and attack cancer cells.
Cancer vaccines come in two categories: preventive (prophylactic) and treatment (active). Preventive vaccines, such as the Human Papillomavirus (HPV) vaccine, protect against viruses that cause certain...
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The targeted cancer therapies, also known as “molecular targeted therapies,” take advantage of the molecular and genetic differences between the cancer cells and the normal cells. It needs a thorough understanding of the cancer cells to develop drugs that can target specific molecular aspects that drive the growth, progression, and spread of cancer cells without affecting the growth and survival of other normal cells in the body.
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Cancer therapies are various modes of treatment, such as surgery, radiation therapy, and chemotherapy that are administered to cancer patients.
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Cancer is the second leading cause of death in the United States. A cancer cell is genetically unstable and hence can mutate faster. They can also modify their microenvironment and escape immune surveillance. The difficulties in treating cancer are further compounded by the emergence of rapid resistance to anticancer drugs. The most common ways to attain resistance in cancer cells include alteration in drug transport and metabolism, modification of drug target, elevated DNA damage response, or...
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Related Experiment Video

Updated: Mar 7, 2026

Using Mouse Mammary Tumor Cells to Teach Core Biology Concepts: A Simple Lab Module
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Tamoxifen as an immunotherapy.

Leslie K Ferrarelli1

  • 1Science Signaling, AAAS, Washington, DC 20005, USA.

Science Signaling
|February 16, 2017
PubMed
Summary

Antiestrogen drugs show potential for treating estrogen receptor-negative tumors. These drugs work by reducing the activity of immune cells that suppress anti-tumor responses.

Area of Science:

  • Oncology
  • Immunology

Background:

  • Estrogen receptor-negative (ER-) tumors lack estrogen receptors, making them unresponsive to traditional endocrine therapies.
  • The tumor microenvironment, including immune cells, plays a critical role in cancer progression.
  • Suppressor immune cells can hinder anti-tumor immune responses.

Purpose of the Study:

  • To investigate the potential of antiestrogen drugs in treating estrogen receptor-negative tumors.
  • To explore the mechanism by which antiestrogen drugs might exert anti-tumor effects in ER- tumors.

Main Methods:

  • Utilizing in vitro and/or in vivo models of ER- tumors.
  • Assessing the effects of antiestrogen drugs on tumor cell proliferation.
  • Evaluating the impact of antiestrogen drugs on the proliferation and activity of suppressive immune cells within the tumor microenvironment.

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Main Results:

  • Antiestrogen drugs demonstrated an ability to limit the proliferation of ER- tumor cells.
  • These drugs were found to reduce the proliferation and activity of suppressive immune cells.
  • This suggests a dual mechanism of action involving direct anti-tumor effects and modulation of the immune microenvironment.

Conclusions:

  • Antiestrogen drugs may offer a therapeutic strategy for estrogen receptor-negative cancers.
  • The anti-tumor efficacy of antiestrogen drugs in ER- tumors appears to be mediated, in part, by their effects on suppressive immune cells.