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Cancer Medicine (Oncology)
Understanding the fundamentals of cancer biology and tumour classification
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Introduction
What Is Cancer?
Cancer is a disease characterised by unrestrained and excessive multiplication of body cells. It may occur in any body tissue and at any age, although cancer is found most frequently in older people.
Cancerous cells accumulate as growths called malignant tumours, which penetrate, compress, and ultimately destroy the surrounding normal tissue. In addition to their local growth, cancerous cells also have the ability to spread throughout the body by way of the bloodstream or lymphatic vessels.
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Tumour Biology
Understanding Tumours (Neoplasms)
Tumours, also called neoplasms, are masses or growths that arise from normal tissue. They represent abnormal cellular proliferation that can vary significantly in their behaviour and clinical significance.
Benign Tumours
Nonprogressive and not life-threatening
Pre-malignant
Early cancer without invasion
Malignant Tumours
Progressive and life-threatening
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Benign Tumours: Key Features
Nonprogressive Growth
Benign tumours are nonprogressive and not life-threatening. They remain localised and do not pose significant health risks to patients.
Encapsulation
Often encapsulated within a fibrous capsule or cover so that the tumour cells do not invade the surrounding tissue. This containment prevents spread.
Slow Growth Rate
These tumours grow slowly and predictably, allowing for easier monitoring and management by healthcare professionals.
Organised Structure
Composed of highly organised and specialised (differentiated) cells, which closely resemble normal, mature tissue in structure and function.
No Metastasis
Cells from benign tumours do not spread to form secondary tumour masses in other places in the body, limiting their impact.
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Pre-malignant
Carcinoma In Situ
Pre-malignant or Carcinoma in situ (CIS) is an early form of cancer that is defined by the absence of invasion of tumour cells into the surrounding tissue.
The neoplastic cells proliferate in their normal habitat, hence the name "in situ". For example, carcinoma in situ of the skin is the accumulation of neoplastic epidermal cells within epidermis only, that has failed to penetrate into the deeper dermis.
Critical Understanding: CIS is considered a precursor or incipient form of cancer that may, if left untreated long enough, transform into a malignant neoplasm.
Many forms of invasive carcinoma (the most common form of cancer) originate after progression of a CIS lesion. Therefore, early detection and treatment of CIS is crucial in preventing cancer development.
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Malignant Tumours: Dangerous Characteristics
Malignant tumours represent the most serious form of neoplastic growth, characterised by aggressive behaviour and life-threatening potential.
Progressive Nature
Life-threatening and continuously advancing
Rapid Multiplication
Malignant tumour cells multiply rapidly and uncontrollably
Invasive Growth
Extends beyond tissue of origin into adjacent organs
Primitive Cells
Resemble embryonic cells without mature functions
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Critical Concept
Metastasis: Cancer's Spread
Malignant tumours can detach themselves from the primary (original) tumour site, travel through the bloodstream and lymphatic system, and establish a new tumour site at a distant region within the body.
Spread of malignant tumour to a secondary site is called metastasis. This ability to metastasise is what makes malignant tumours particularly dangerous and difficult to treat.
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Benign vs Malignant: Key Differences
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Classification
Cancer Classification System
Cancers are classified by the type of cell that the tumour cells resemble and is therefore presumed to be the origin of the tumour. This classification system helps clinicians determine appropriate treatment strategies and predict patient outcomes.
01
Carcinoma
Derived from epithelial cells
02
Sarcoma
Arising from connective tissue
03
Lymphoma & Leukaemia
From blood-forming cells
04
Germ Cell Tumour
Derived from pluripotent cells
05
Blastoma
From immature precursor cells
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Carcinoma: Most Common Cancer Type
Carcinomas are cancers derived from epithelial cells. This group includes many of the most common cancers, particularly in the aged population.
Epithelial cells form the lining of body surfaces, cavities, and organs. When these cells become cancerous, they can develop into various types of carcinomas affecting different organs.
Common Carcinoma Sites:
  • Breast carcinoma
  • Prostate carcinoma
  • Lung carcinoma
  • Pancreatic carcinoma
  • Colon carcinoma
Carcinomas account for approximately 80-90% of all cancer diagnoses, making them the most prevalent cancer type worldwide.
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Sarcoma: Connective Tissue Cancers
Sarcomas are cancers arising from connective tissue, including bone, cartilage, fat, and nerve tissue. Each type develops from cells originating in mesenchymal cells outside the bone marrow.
Bone Sarcomas
Osteosarcoma and Ewing's sarcoma affecting skeletal structures
Cartilage Sarcomas
Chondrosarcoma developing in cartilaginous tissue
Soft Tissue Sarcomas
Liposarcoma and fibrosarcoma in fat and fibrous tissues
Sarcomas are relatively rare, accounting for less than 1% of all adult cancers, but are more common in children and young adults.
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Blood Cancers
Lymphoma and Leukaemia
Lymphoma
Lymphomas arise from haematopoietic (blood-forming) cells that leave the marrow and tend to mature in the lymph nodes.
  • Hodgkin's lymphoma
  • Non-Hodgkin's lymphoma
  • Affects lymphatic system
Leukaemia
Leukaemias arise from haematopoietic cells that leave the marrow and tend to mature in the blood.
  • Acute leukaemia
  • Chronic leukaemia
  • Affects blood and bone marrow
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Germ Cell Tumours
Germ cell tumours are cancers derived from pluripotent cells, most often presenting in the reproductive organs. These tumours arise from the cells that give rise to eggs and sperm.
Testicular Tumours
Seminoma is the most common type, typically affecting men between 25-45 years of age.
Ovarian Tumours
Dysgerminoma is the ovarian equivalent, though less common than seminoma.
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Blastoma: Embryonic Cell Cancers
Blastomas are cancers derived from immature "precursor" cells or embryonic tissue. These tumours are most common in children, as they arise from cells that should have matured during foetal development.
Common Types of Blastomas:
  1. Neuroblastoma (nerve tissue)
  1. Retinoblastoma (eye tissue)
  1. Hepatoblastoma (liver tissue)
  1. Nephroblastoma/Wilms tumour (kidney tissue)
  1. Medulloblastoma (brain tissue)
The suffix "-blastoma" indicates that the tumour originates from immature, embryonic-like cells that have retained their ability to divide rapidly.
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Cancer Development Timeline
Understanding the progression from normal cells to invasive cancer helps in early detection and intervention strategies.
1
Normal Cells
Healthy cells with controlled growth and proper function
2
Hyperplasia
Increased cell division but cells remain normal
3
Dysplasia
Abnormal cell appearance and organisation
4
Carcinoma In Situ
Cancer cells present but not invasive
5
Invasive Cancer
Cancer cells invade surrounding tissue
6
Metastatic Cancer
Cancer spreads to distant sites
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Clinical Significance
Why Classification Matters
Understanding cancer classification is crucial for healthcare professionals in determining appropriate treatment strategies and predicting patient outcomes.
Treatment Planning
Different cancer types respond to different treatments. Carcinomas may require surgery and chemotherapy, whilst leukaemias often need targeted drug therapy.
Prognosis Prediction
Classification helps predict disease progression and survival rates. Germ cell tumours have excellent prognosis, whilst some sarcomas are more challenging.
Research Development
Proper classification enables targeted research into specific cancer types, leading to development of more effective, personalised treatment approaches.
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Cellular Differentiation in Tumours
Well-Differentiated (Benign)
Cells closely resemble normal, mature tissue with organised structure and specialised functions.
  • Organised cellular architecture
  • Mature cellular functions
  • Slow growth pattern
  • Better prognosis
Poorly Differentiated (Malignant)
Cells resemble primitive, embryonic cells without capacity for mature cellular functions.
  • Disorganised structure
  • Loss of specialised functions
  • Rapid growth pattern
  • Poorer prognosis
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Age and Cancer Incidence
Whilst cancer can occur at any age, the incidence varies significantly across different age groups and cancer types.
The chart demonstrates that cancer incidence increases dramatically with age, with older populations experiencing significantly higher rates. This is due to accumulated genetic mutations and decreased immune surveillance over time.
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Pathology
Tumour Growth Patterns
Expansive Growth
Tumour grows outward, pushing surrounding tissue aside. Common in benign tumours with encapsulation.
Infiltrative Growth
Tumour cells invade between normal tissue cells, destroying structure. Characteristic of malignant tumours.
Metastatic Spread
Tumour cells break away and establish secondary growths at distant sites through blood or lymph.
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Routes of Cancer Spread
Understanding how cancer spreads is essential for treatment planning and preventing metastasis.
Haematogenous Spread
Through bloodstream to distant organs
Lymphatic Spread
Through lymph vessels to regional nodes
Direct Extension
Invasion into adjacent tissues and organs
Transcoelomic Spread
Across body cavities like peritoneum
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Key Oncology Terminology
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Clinical Application
Diagnostic Approaches in Oncology
Clinical Examination
Physical assessment and patient history to identify suspicious signs and symptoms
Imaging Studies
X-rays, CT scans, MRI, and PET scans to visualise tumour location and extent
Laboratory Tests
Blood tests, tumour markers, and biochemical analysis to support diagnosis
Tissue Biopsy
Microscopic examination of tissue sample for definitive diagnosis and classification
Molecular Testing
Genetic and molecular analysis to guide targeted therapy selection
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Cancer Statistics Overview
Understanding the global burden of cancer helps in resource allocation and public health planning.
19.3M
New Cases Annually
Global cancer incidence continues to rise
10M
Deaths Per Year
Cancer remains a leading cause of mortality
50M
People Living with Cancer
5-year prevalence worldwide
80%
Carcinomas
Most common cancer type
15%
Other Types
Sarcomas, lymphomas, leukaemias
5%
Rare Cancers
Germ cell and blastomas
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Prevention and Early Detection
Many cancers can be prevented or detected early through lifestyle modifications and screening programmes.
Prevention Strategies
Avoid tobacco
Single most important preventable cause
Healthy diet
Rich in fruits, vegetables, and whole grains
Regular exercise
Maintain healthy body weight
Limit alcohol
Reduce consumption to lower risk
Sun protection
Prevent skin cancer development
Screening Programmes
Mammography
Breast cancer screening for women
Colonoscopy
Colorectal cancer detection
Pap smear
Cervical cancer screening
PSA testing
Prostate cancer monitoring
Skin examination
Melanoma early detection
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