Reducing Your Cancer Risk: Types, Risk Factors, Diagnosis, and Treatment

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Reducing Your Cancer Risk

Types of Cancer

Cancer can be classified in two main ways: by the type of tissue from which the cancer originated, and by the primary site or organ of the body where the cancer is found. Understanding these classifications helps in diagnosis, treatment, and prevention strategies.

By Tissue Type: Cancers are named for the tissue or cell type where they begin.
By Primary Site: Cancers are also named for the organ or body part where they first develop.

Cancer Types by Tissue

Type	Origin	Tumor Type	Examples
Carcinoma	Epithelial cells (skin, glands, and internal surfaces of the body)	Solid	Skin, prostate, lungs, etc.
Sarcoma	Connective & fibrous tissues (bones, cartilage, muscles)	Solid	Osteosarcoma (bone cancer)
Lymphoma	Lymph nodes/lymphatic system	Can be solid	Hodgkin's lymphoma
Leukemia	Blood-forming tissues (bone marrow, lymph nodes, spleen)	Not solid	Acute Lymphocytic Leukemia (ALL)

Carcinoma: Most common type, arises from epithelial cells. Examples include skin, prostate, and lung cancers.
Sarcoma: Originates in connective tissues such as bone and muscle. Example: osteosarcoma.
Lymphoma: Develops in the lymphatic system. Example: Hodgkin's lymphoma.
Leukemia: Cancer of blood-forming tissues, does not form solid tumors. Example: acute lymphocytic leukemia.

Example Question

Question: Abnormal growth of cells in bone is most likely to be a sarcoma.

Types of Cancer by Primary Tumor Site

Cancers are often named for the organ or tissue where they first develop. Each type has unique risk factors, diagnostic methods, and treatments.

Type	Risk Factors	Diagnosis	Treatment
Lung Cancer	Smoking, asbestos, radon	Persistent cough, imaging (chest X-ray, CT scan), biopsy	Surgery (early stages), radiation, chemotherapy
Breast Cancer	Genetics, age, gender, alcohol use	Lump or clinical breast exam, mammography	Surgery, radiation, chemotherapy, hormone therapy
Prostate Cancer	Age, genetics, ethnicity, diet, hormones	PSA blood test, digital rectal exam	Radiation, surgery, hormone therapy
Colorectal Cancer	Age, genetics, diet, alcohol, smoking	Colonoscopy, stool screening tests	Surgery (primary treatment), chemotherapy

Lung Cancer: Strongly linked to smoking and environmental exposures.
Breast Cancer: Risk increases with age, family history, and certain lifestyle factors.
Prostate Cancer: More common in older men; screening includes PSA test.
Colorectal Cancer: Screening (colonoscopy) is important for early detection.

Example Question

Question: Which of the following methods is not likely to help in cancer diagnosis? Answer: Administration of HPV vaccine (prevents, but does not diagnose cancer).

Diagnosis and Treatment of Cancer

Early diagnosis and appropriate treatment are crucial for improving cancer outcomes. Methods vary by cancer type and stage.

Diagnosis: May include imaging (X-ray, CT, MRI), laboratory tests (blood, urine), biopsies, and genetic testing.
Treatment: Common methods include surgery, radiation therapy, chemotherapy, and targeted therapies.

Example Questions

Which of the following is not a cancer treatment method? Answer: Administration of HPV vaccine (it is a preventive measure, not a treatment).
Which of the following statements about prostate cancer is correct? Answer: The risk of prostate cancer increases with age.
Which of the following statements about colorectal cancer is incorrect? Answer: Having more polyps does not increase the risk of colorectal cancer. (This is incorrect; more polyps do increase risk.)

Key Terms

Carcinoma: Cancer arising from epithelial cells.
Sarcoma: Cancer arising from connective tissues.
Lymphoma: Cancer of the lymphatic system.
Leukemia: Cancer of blood-forming tissues.
Biopsy: Removal of tissue for diagnostic examination.
Metastasis: Spread of cancer cells from the original site to other parts of the body.

Additional info:

Prevention strategies include avoiding tobacco, maintaining a healthy diet, regular physical activity, and participating in recommended screening programs.
Early detection greatly improves the chances of successful treatment.