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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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Drug Classes and Categories01:25

Drug Classes and Categories

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Drugs can be classified according to their chemical composition or their intended therapeutic application. For instance, anti-infective agents that possess the ability to eliminate pathogens or suppress their growth and reproduction can be grouped based on the organisms they target or their chemical structure. Furthermore, drugs can be divided into prescription, nonprescription, or controlled substances. Prescription medications, such as antibiotics, require oversight from a licensed healthcare...
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Antibody Structure and Classes01:25

Antibody Structure and Classes

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Antibodies, also known as immunoglobulins, are produced by B cells in response to foreign substances, such as bacteria and viruses. These proteins are critical for recognizing and neutralizing these substances, protecting the body from potential harm.
The basic structure of an antibody consists of four protein chains: two identical heavy chains and two identical light chains. These chains are held together by disulfide bonds and other non-covalent interactions, forming a Y-shaped structure.
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Antihypertensive Drugs: Thiazide-Class Diuretics01:15

Antihypertensive Drugs: Thiazide-Class Diuretics

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Thiazide diuretics are sulfonamide derivatives featuring a benzothiadiazine ring system in their molecular structure. Based on this structure, thiazide diuretics can be categorized into two groups: thiazide-type and thiazide-like diuretics. Thiazide-type diuretics, including hydrochlorothiazide and chlorothiazide, consist of a benzothiadiazine backbone with an attached sulfonamide group. Thiazide-like diuretics, such as chlorthalidone and indapamide, lack the thiazide ring but demonstrate...
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Chromatin Position Affects Gene Expression02:35

Chromatin Position Affects Gene Expression

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Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences  access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area. 
Topologically Associated Domains (TADs)
The 3-dimensional positioning of chromatin in the nucleus influences the...
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What is Gene Expression?01:42

What is Gene Expression?

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Overview
Gene expression is the process in which DNA directs the synthesis of functional products, that is, proteins. Cells can regulate gene expression at various stages. It allows organisms to generate different cell types and enables cells to adapt to internal and external factors.
Genetic Information Flows from DNA to RNA to Protein
A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is made up of nucleotides and proteins consist of amino...
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Perioperative chemoimmunotherapy induces strong immune responses and long-term survival in patients with HLA class I-deficient non-small cell lung cancer.

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Related Experiment Video

Updated: Jan 24, 2026

Isolation of Cancer Stem Cells From Human Prostate Cancer Samples
07:16

Isolation of Cancer Stem Cells From Human Prostate Cancer Samples

Published on: March 14, 2014

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HLA Class-I Expression and Cancer Immunotherapy.

Federico Garrido1

  • 1Departamento de Analisis Clinicos e Inmunologia, Hospital Universitario Virgen de las Nieves, Facultad de Medicina, Universidad de Granada, Granada, Spain.

Advances in Experimental Medicine and Biology
|May 30, 2019
PubMed
Summary

Tumor cells with irreversible HLA class I loss evade cancer immunotherapy. Reversible HLA class I alterations offer potential therapeutic targets for boosting anti-tumor T lymphocyte responses.

Keywords:
Cancer immunotherapyCheckpoint antibodiesHLA class I lossHLA gene therapyHLA hard alterationsHLA soft alterationsHLA-I mutationsHLA-I upregulationImmune selectionLoss of heterozygosityRecovery HLA-I

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Area of Science:

  • Immunology
  • Oncology
  • Genetics

Background:

  • Cancer immunotherapy effectiveness varies, with some metastatic lesions progressing despite treatment.
  • Tumor cells can alter Human Leukocyte Antigen (HLA) class I expression to evade immune detection.
  • T lymphocytes are crucial for tumor rejection, but their responses need optimization.

Purpose of the Study:

  • To analyze the impact of HLA class I loss on cancer immunotherapy outcomes.
  • To explore the mechanisms behind differential responses of metastatic lesions to immunotherapy.
  • To investigate how to enhance T lymphocyte-mediated anti-tumor responses.

Main Methods:

  • Analysis of molecular mechanisms underlying Major Histocompatibility Complex (MHC)/HLA class I alterations in tumors.
  • Categorization of HLA lesions as 'reversible/soft' or 'irreversible/hard'.
  • Integration of these concepts within the context of immune checkpoint antibody therapies.

Main Results:

  • Tumor cells with irreversible HLA class I lesions are likely to escape immune surveillance and lead to disease progression.
  • Tumor cells with reversible HLA class I lesions may regain expression, making them susceptible to immune destruction.
  • The ability to reverse HLA class I expression is critical for successful immunotherapy.

Conclusions:

  • HLA class I alterations are key determinants of immunotherapy success or failure.
  • Distinguishing between reversible and irreversible HLA lesions is vital for predicting treatment outcomes.
  • Future research should focus on overcoming irreversible HLA class I loss to improve cancer immunotherapy efficacy.