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Cancer: Tumours, Metastasis and Diagnosis

Cancer is a disease of uncontrolled cell division in which abnormal cells may form tumours and, in malignant cases, invade nearby tissues or spread to distant sites.

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Student-friendly explanation

Normal cell division is regulated by cellular controls. Cancer develops when these controls fail due to genetic changes influenced by carcinogens, radiation, certain viruses, or inherited susceptibility. Benign tumours remain localised and usually do not invade surrounding tissues. Malignant tumours grow aggressively, invade tissues, and may spread through blood or lymph, a process called metastasis. Diagnosis may involve biopsy and imaging, while treatment at school level includes surgery, radiation therapy, chemotherapy, and immunotherapy. Exams focus on benign versus malignant tumours, metastasis, carcinogens, and early detection.

How to write this in exams

  1. 1

    Start with the exact idea

    Cancer is a disease of uncontrolled cell division in which abnormal cells may form tumours and, in malignant cases, invade nearby tissues or spread to distant sites.

  2. 2

    Then show how to use it

    Define cancer as uncontrolled cell division. Mention failure of regulatory control. Distinguish benign and malignant tumours. Explain invasion and metastasis. Add carcinogens and diagnostic or treatment methods if asked.

  3. 3

    Add one concrete example

    A malignant tumour in one tissue can release cells into blood or lymph, allowing secondary tumours to form elsewhere. This spreading ability makes metastasis a key cancer feature.

  4. 4

    Avoid this incomplete answer

    Writing that biopsy is a treatment is wrong; biopsy is a diagnostic examination of tissue.

Definition

Cancer is a disease of uncontrolled cell division in which abnormal cells may form tumours and, in malignant cases, invade nearby tissues or spread to distant sites.

Example

A malignant tumour in one tissue can release cells into blood or lymph, allowing secondary tumours to form elsewhere. This spreading ability makes metastasis a key cancer feature.

Rule to remember

Cancer mechanism rule: loss of cell-cycle control can produce tumours; malignant tumours invade and metastasise, while benign tumours remain localised.

Memory hook

Cancer answers become clear with BMIC: Benign stays local, Malignant Invades, and cancer cells may Circulate through blood or lymph to metastasise.

Examples and method

Worked example

Question: Differentiate benign and malignant tumours. Answer: Benign tumours remain localised and do not invade, while malignant tumours invade surrounding tissues and may metastasise.

Method to apply

Define cancer as uncontrolled cell division. Mention failure of regulatory control. Distinguish benign and malignant tumours. Explain invasion and metastasis. Add carcinogens and diagnostic or treatment methods if asked.

Diagram support

A schematic can show normal cells, benign tumour boundary, malignant invasion, blood or lymph spread, and secondary tumour. Students should label metastasis clearly.

How CBSE asks it

Asked as definition of metastasis, benign-malignant comparison, carcinogen examples, biopsy meaning, and treatment-method identification.

Avoid common mistakes

Common confusion

Students often write that every tumour is cancerous. Benign tumours are localised, while malignant tumours are cancerous and invasive.

Common wrong answer

Writing that biopsy is a treatment is wrong; biopsy is a diagnostic examination of tissue.

Exam tip

Always distinguish uncontrolled division, malignant nature, invasion, metastasis, and carcinogen with exact terms.

Quick check

Why is metastasis considered dangerous in cancer?

Metastasis is dangerous because malignant cells spread from the original tumour to distant body parts, making the disease harder to localise and treat.

Answer writing and exam use

1-mark answer

Define cancer, mention uncontrolled division, differentiate benign and malignant tumours, explain metastasis, name carcinogens or diagnostic methods, and add treatment examples only if asked.

2-mark answer

Define cancer, mention uncontrolled division, differentiate benign and malignant tumours, explain metastasis, name carcinogens or diagnostic methods, and add treatment examples only if asked.

3-mark answer

Define cancer, mention uncontrolled division, differentiate benign and malignant tumours, explain metastasis, name carcinogens or diagnostic methods, and add treatment examples only if asked.
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