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Related Concept Videos

The Retinoblastoma Gene01:20

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Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
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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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Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
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The Ras-gene-encoded proteins are regulators of signaling pathways controlling cell proliferation, differentiation, or cell survival. The Ras-gene family in humans constitutes three primary members—the HRas, NRas, and KRas. These genes code for four functionally distinct yet closely related proteins—the HRas, NRas, KRas4A, and KRas4B. The involvement of mutant Ras genes in human cancer was first discovered in 1982 and is among the most common causes of human tumorigenesis.
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Related Experiment Video

Updated: Oct 25, 2025

Reconstruct Human Retinoblastoma In Vitro
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Targeting RB1 Loss in Cancers.

Paing Linn1,2, Susumu Kohno1, Jindan Sheng1

  • 1Division of Oncology and Molecular Biology, Cancer Research Institute, Kanazawa University, Kanazawa 920-1192, Japan.

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|August 7, 2021
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Summary

The retinoblastoma protein 1 (RB1) tumor suppressor

Keywords:
E2FRB1chromatin instabilitycollateral lethalitysynthetic lethality

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Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Genetics

Background:

  • The Retinoblastoma protein 1 (RB1) gene acts as a crucial tumor suppressor.
  • RB1 function is critical for cell cycle regulation and is disrupted in various cancers.
  • Loss of RB1 function contributes to malignant progression through diverse mechanisms.

Purpose of the Study:

  • To summarize therapeutic strategies targeting RB1 aberrations in cancer.
  • To highlight novel approaches for RB1-deficient tumors.

Main Methods:

  • Review of current literature on RB1 function and cancer therapy.
  • Analysis of therapeutic vulnerabilities associated with RB1 loss.
  • Exploration of targeting mechanisms including mitotic kinase inhibition.

Main Results:

  • RB1 loss drives tumorigenesis in specific cancers like retinoblastoma and small cell lung cancer.
  • RB1 function is suppressed in many cancers via various mechanisms.
  • Inhibition of mitotic kinases shows synthetic lethality with RB1 deficiency.
  • Targeting genes co-deleted with RB1 reveals vulnerabilities.

Conclusions:

  • RB1-targeted molecules and pathways are promising therapeutic targets.
  • Novel therapies are being developed to exploit RB1 loss-induced vulnerabilities.
  • Understanding RB1 aberrations is key to developing effective cancer treatments.