Oncogenes are mutated or overexpressed versions of normal genes called proto-oncogenes. These genes regulate cell growth and division. When an oncogene is activated, it can lead to uncontrolled cell proliferation, which is a hallmark of cancer development. Other options listed are genes associated with different genetic conditions, not cancer specifically.

Radon is a radioactive noble gas that has been used in brachytherapy, a form of radiotherapy where a sealed radiation source is placed inside or next to the area requiring treatment. The ionizing radiation emitted by radon isotopes can damage the DNA of cancer cells, inhibiting their ability to divide and grow. While less common today due to safety concerns, it remains historically significant in cancer treatment.

Chromosomal aberrations, such as translocations, deletions, or aneuploidy, are hallmarks of cancer cells. These genomic instabilities often result from defects in DNA repair mechanisms or cell cycle checkpoints. The accumulation of these mutations allows cancer cells to bypass normal growth controls, leading to uncontrolled proliferation and the progression of malignancy within the host tissue.

Chemotherapy is a standard cancer treatment that uses powerful chemical substances (drugs) to kill rapidly dividing cancer cells throughout the body. It is often used in combination with surgery or radiation therapy. While other therapies like physiotherapy may help with rehabilitation, chemotherapy is the primary pharmacological intervention for systemic cancer treatment.

Leukaemia is a malignancy of the blood-forming tissues, primarily the bone marrow. It is characterized by the uncontrolled proliferation of abnormal white blood cells, which crowd out healthy blood cells and impair the body's ability to fight infection and transport oxygen. Unlike solid tumors that affect organs like the lungs or skin, leukemia is a systemic disease of the hematopoietic system.

Cancer is defined by the loss of normal cell cycle regulation, leading to uncontrolled and rapid cell division. This proliferation results in the formation of tumors or masses. Unlike normal cells, cancer cells ignore signals that would typically stop division, allowing them to invade surrounding tissues and potentially metastasize to other parts of the body.

Metastasis is the hallmark of malignant cancer, where cells break away from the primary tumor, travel through the circulatory or lymphatic systems, and establish secondary tumors in distant organs. This process is distinct from localized cell division or normal mitotic processes.

Oncogenes are mutated or overexpressed versions of normal genes (proto-oncogenes) that regulate cell growth and division. When these genes are altered, they can cause cells to grow and divide uncontrollably, leading to the formation of tumors and the development of cancer. They are fundamental to the molecular biology of malignant transformation.

An oncogene is a mutated or overexpressed version of a proto-oncogene that promotes uncontrolled cell proliferation. When these genes are activated, they disrupt normal cell cycle regulation, leading to the formation of tumors and the development of cancer, distinguishing them from infectious pathogens like those causing malaria or typhoid.

Malignant tumors are characterized by uncontrolled cell growth and the capacity to invade adjacent healthy tissues. Unlike benign tumors, which remain localized, malignant tumors can metastasize, meaning they can spread to distant sites in the body through the bloodstream or lymphatic system.