QCM : Cancer Biology Essentials — 10 questions

Explication

The 'Hallmarks of Cancer' refer to the fundamental biological capabilities that cancer cells acquire during tumor development, such as sustained proliferation, evasion of apoptosis, and metastasis. These traits enable cancer cells to grow uncontrollably, survive despite stress, and spread to other parts of the body. This concept was first proposed by Hanahan and Weinberg to describe the key features that distinguish cancer cells from normal cells.

Explication

Hanahan and Weinberg introduced the original six hallmarks of cancer, defining key traits that enable cancer progression, making them foundational figures in cancer biology.

Explication

TP53 is a tumor suppressor gene that plays a crucial role in regulating the cell cycle, particularly at the G1/S checkpoint, and is frequently mutated in various cancers, leading to cell cycle dysregulation. Mutations in TP53 impair its ability to induce cell cycle arrest or apoptosis in response to DNA damage, contributing to uncontrolled cell proliferation. While KRAS, MYC, and CDK4/6 are also involved in cell proliferation pathways, TP53 is most directly and commonly associated with cell cycle regulation dysregulation in cancer.

Explication

Telomerase activation maintains telomere length, preventing cellular aging and allowing cancer cells to divide indefinitely, which is essential for tumor growth.

Explication

Classifying cancer types based on their tissue of origin, such as carcinoma, sarcoma, leukemia, and lymphoma, primarily helps in identifying the origin of the tumor and guiding appropriate diagnosis, prognosis, and treatment strategies. This classification is essential for selecting targeted therapies and understanding the tumor's behavior.

Explication

Inducing angiogenesis enables tumors to develop new blood vessels, crucial for supplying oxygen and nutrients necessary for tumor expansion.

Explication

Reprogramming energy metabolism, including evading immune destruction, encompasses mechanisms like inflammation that promote tumor progression.

Explication

Cell cycle dysregulation in cancer involves disruptions in the ordered progression and regulation of cell division, affecting multiple phases and mechanisms.

Explication

Antiviral medications are not direct treatments targeting cancer hallmarks; instead, therapies like angiogenesis inhibitors and immune checkpoint inhibitors are designed to disrupt specific hallmarks of cancer.

Explication

Hanahan and Weinberg expanded the original hallmarks to encompass additional traits like metabolic reprogramming and immune evasion, reflecting advances in understanding cancer biology.