Cell regulation and metastasis & Genetic changes are not always inherited
Lesson 1 · 5 min
Based on MedlinePlus en español — Cancer Biology and Diagnosis. Original educational summary, read by a medical doctor and confirmed reliable, pending formal approval. Not medical advice.
Learning objectives
- Explain cell regulation and metastasis.
- Explain genetic changes are not always inherited.
Cell regulation and metastasis
Cancer begins when normal cell regulation fails. Cells may multiply unnecessarily or survive when they should die, producing extra cells that can form tumors. Benign tumors are not cancer; malignant cells can invade nearby tissue and spread elsewhere. Distant spread is called metastasis. The difference concerns biological behavior rather than simply whether a lump exists, and normal replacement of cells is not the same process as uncontrolled malignant growth.
Genetic changes are not always inherited
Cancer includes more than one hundred types and can start in many body sites. Names may identify location or cell type: carcinomas arise from epithelial cells, while sarcomas involve bone or soft tissues. Cancer is genetic because gene changes drive it, but these can develop during life. Only some arise from inherited variants. Calling a disease genetic therefore does not establish that it was passed down by parents.
Key concepts
- Cell regulation and metastasis
- Cancer begins when normal cell regulation fails.
- Genetic changes are not always inherited
- Cancer includes more than one hundred types and can start in many body sites.
- Symptoms, imaging, and biopsy
- A new lump, unexplained bleeding, a nonhealing sore, swallowing difficulty, or a changing mole can warrant assessment.
- Treatment and risk reduction
- Treatment depends on cancer type and extent.