Cancer is indeed one of the most talked-about health issues. However, there are still many inquiries regarding cancer, including what it truly is, how it forms, and what differentiates the cancers that spread to others from the ones that do not.
Cancer can be defined as a collective group of diseases during which abnormal cells grow uncontrollably in the body. It is important to mention that these cells can either lead to a formation of tumours, invade local tissues or spread through the organism.
There are also different kinds of cancer types, which, however, do not all behave in the same way. For example, some types develop rather slowly while others may grow faster than normal.
Thus, having knowledge about the basics of cancer makes it possible for the patients and their families to understand the illness better and communicate with professionals easily.
What Is Cancer?
Cancer occurs when cells in the body develop changes in their DNA that affect how they grow, divide, and survive.
Normally, cells follow a controlled life cycle. They grow when needed, divide to produce new cells, and eventually die when they are damaged or no longer needed.
It is important to know that cancer cells act abnormally, and here are some examples of abnormal behavior:
- Uncontrolled growth and division without regulation.
- Resistance to apoptosis, or programmed cell death, due to damage.
- Invasion of surrounding tissues.
- Entry into the bloodstream or lymphatic circulation.
- Metastasis to distant body locations.
When the cancerous growth starts spreading to new areas outside its original site, it is known as metastasis.
How Does Cancer Start?
Generally speaking, cancers do not start suddenly. Most often, they arise after a long period of time. Our bodies have millions of cells that carry DNA. Our DNA tells the cell how it should work properly.
DNA mutation affects gene expression related to cell proliferation and healing. The cause of DNA mutations can vary greatly.
Genetic Changes: Mutations acquired from one of our parents can elevate the risk of getting cancer. However, hereditary mutations cause only a minor percentage of cases. Mostly, changes occur throughout our lives.
Environmental & Behavioral Risk Factors: Contacting certain chemicals or behaviors raises cancer risk.
These include:
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Smoking cigarettes
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Drinking too much alcohol
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Sunlight and ultraviolet light
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Specific viruses
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Chemicals at work or in the environment
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Being overweight
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Inadequate exercise
Not everybody exposed to a risk factor will develop cancer, and others develop cancer without any known risk factors present.
Causes of Cancer
Most cancers have multiple causes. Cancer results from a mixture of genetics, environment, behavior, biology, and more. Different cancers will each have various specific causes.
As examples, tobacco, smoking has been linked with lung and many other types of cancers. Infections with particular strains of HPV cause cervical cancers.
Other cancers result from mutations in genes passed down genetically, hormonal imbalances, radiological exposure, constant inflammation, and other mechanisms. Occasionally, physicians may not know why a patient developed cancer.
What Is a Tumour?
A tumour is defined as a growth consisting of cells that have become uncontrolled. It is important to note that a tumour may not necessarily mean cancer.
There are different kinds of tumours, including:
- Benign tumours: A benign tumour is noncancerous. These tumours typically do not spread into adjacent structures or metastasize to distant areas within the body. However, some may lead to complications due to their location and size.
- Malignant tumours: A malignant tumour is cancerous. It spreads to adjoining regions and possibly elsewhere within the body.
It is worth noting that not all cancers involve solid tumours. For instance, leukemia is a cancer affecting tissues responsible for making blood and does not produce any solid mass.
Types of Cancer and Their Sites of Origin
There are numerous forms of cancer. They are classified based on their origin sites.
For instance, carcinomas originate from epithelial cells lining various tissues and organs. Carcinomas represent one of the most common types of cancer.
Examples include:
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Breast Cancer
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Lung Cancer
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Prostate Cancer
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Colorectal Cancer
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Skin Cancer.
Sarcomas: Sarcomas form in the connective tissue within bones, muscles, adipose tissues, cartilages, and blood vessels.
Leukemias: Leukemias are malignancies originating in the tissues forming blood. These malignancies lead to the generation of abnormal cells in the bloodstream.
Lymphomas: Lymphomas arise from lymphatic tissues and consist of two types: Hodgkin lymphoma and non-Hodgkin lymphoma.
Myeloma: Myeloma arises from the malignant transformation of plasma cells, which function as part of the adaptive immunity of the body and reside in the bone marrow.
Brain and Spinal Cord Tumours: Cancers and tumours arising in the brain and spinal cords depend on their anatomic sites and biological features for symptoms and treatments.
What Is the Difference Between Cancer and Metastatic Cancer?
Localized cancer refers to cancer that stays within its initial site of origin.
Metastatic cancer occurs when cancer cells move away from the original tumour to distant body sites.
Breast cancer, which spreads to bones, is not classified as bone cancer. Instead, it is classified based on its place of origin, namely, breast cancer.
Treatment options for metastatic cancer exist, and treatment goals vary among different kinds of cancers and individual patients' conditions.
What Are the Stages of Cancer?
Cancer staging involves determining how far a particular cancer has progressed, including metastasis.
For most solid cancers, four stages typically classify the extent of cancer progression. However, each cancer staging scheme varies according to the cancer type.
Here are basic stages:
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Early-stage cancer: Cancer that is relatively restricted without widespread dissemination.
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Locally advanced cancer: Cancer that grows into adjacent tissues or lymph nodes.
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Metastatic/Advanced Cancer: Cancer that has disseminated to distant locations within the patient's body.
These classifications assist healthcare professionals in understanding the progression of disease for treatment purposes.
Not all cancers fall into these categories. Other forms of cancer include blood cancer and brain tumours.
What Are the Common Signs and Symptoms of Cancer?
Symptoms of cancer will differ widely according to the type of cancer and where it is located in the body.
Some possible symptoms may include the following list:
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A lump or swelling that does not have any known reason for being there.
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Weight loss without having tried to lose weight.
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Fatigue.
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Unusual bleeding.
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A cough that lasts for an extended period of time or difficulty breathing.
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Changes in how the body eliminates urine and stool.
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Having trouble swallowing.
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Constant pain.
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Skin lesions that have changed appearance.
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Unusual fever at night for certain forms of cancer.
None of these symptoms indicate that someone definitely has cancer; there could be another reason for all of them.
The importance lies in the persistence or unusual nature of these symptoms. They need to be checked out by medical professionals.
How Is Cancer Diagnosed?
Typically, a cancer diagnosis requires multiple stages.
Medical History and Physical Exam: Your physician will inquire about your symptoms, medical background, family history, lifestyle, and past medical issues.
Imaging Studies: Depending on the kind of cancer suspected, your physician will perform one of the following:
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X-ray studies
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Ultrasound exam
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CT scanning
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Magnetic Resonance Imaging (MRI)
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Positron Emission Tomography-Computed Tomography (PET-CT)
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Mammogram
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Specialized imaging exams
Biopsy: During a biopsy, tissue specimens are collected and sent for analysis under a microscope. In most instances, a biopsy along with pathology testing is required for confirming a cancer diagnosis and specifying its subtype.
Laboratory/Molecular Testing: Additional bloodwork and laboratory testing are also helpful. Some cancers require specialized molecular/genetic testing to detect unique abnormalities.
What Are the Main Cancer Treatment Options?
Your medical oncologist will determine your course of action based on your cancer diagnosis and overall state of health. Cancer treatments vary according to type, grade/stage, cellular makeup, and patient factors.
Treatment options include:
- Surgery: Surgical intervention involves cutting out cancerous tissues. This procedure remains vital in managing various solid tumour types.
- Chemotherapy: This modality utilizes medication to eliminate cancer cells or inhibit further development/replication of these cells.
- Radiation Therapy: This treatment method utilizes high doses of radiations to eliminate cancer cells or halt their proliferation.
- Immunotherapy: This modality assists the body's immune system in recognizing cancerous cells and eliminating them.
- Targeted Treatment: This type of medicine targets certain biological processes responsible for cancer proliferation within affected individuals.
- Hormonal Treatment: Certain cancers thrive off particular hormones. Thus, hormonal interventions can interfere with these hormonal influences.
- Stem Cell/Bone Marrow Transplantation: This technique proves valuable in treating particular malignancies affecting the bloodstream/bone marrow.
- Cellular Treatments: Certain cellular therapies exist for managing select forms of cancers involving the bloodstream. This modality entails modifying patient immune cells to combat cancerous growth.
It is to be noted that patients can undergo either one type of intervention or multiple concurrent modalities depending on their unique circumstances.
Can Cancer Be Prevented?
While cancer may be unavoidable, there are actions that could decrease one’s chances of having several forms of the disease.
These include:
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Eliminating tobacco use
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Restricting alcohol intake
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Achieving a healthy body mass index (BMI)
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Remaining physically active
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Eating a balanced diet
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Preventing unnecessary skin exposure to UV light
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Receiving necessary vaccinations, such as HPV and hepatitis B
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Abiding by the relevant guidelines for cancer screening
Proper cancer screening allows the early detection of certain types of cancer or their precursors.
Examples include cervical, breast, colorectal, and lung cancer screenings in those qualified based on age and other factors.
Why Early Detection Matters
Early diagnosis might improve your prognosis and increase treatment choices, but not necessarily in all cancers. You will have the greatest chance of getting an accurate prognosis if you discuss any unusual or continuous changes with your doctor rather than attempting to self-diagnose anything online.
What to Expect Following a Cancer Diagnosis
Once you are diagnosed with cancer, you do not immediately begin treatment right away.
Your oncologists must learn many facts about the cancer before deciding how best to fight it:
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What type of cancer do you have?
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Where did it start?
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Has it progressed?
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Has it metastasized elsewhere?
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What are its pathologic findings?
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Are there certain biomarkers/genetic alterations within it?
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Overall general well-being of the patient?
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What prior treatments did you receive?
Your oncologist can now determine the appropriate strategy to tackle your unique case based on these factors.
Sometimes, it might help to get a second opinion if you want to fully comprehend everything related to the cancer.
Cancer Treatment in India
India offers many cancer hospitals and oncology centers. The options vary based on the particular facility and what types of treatments are available. Treatments include surgery, chemotherapy, radiotherapy, immunotherapy, targeted therapy, molecular testing, robot-assisted surgery, cutting-edge radiation therapies, nuclear medicine therapies, and certain cellular therapies.
In some cases, hospitals may even offer international patient services specifically designed for patients who come from overseas for treatment.
For example, if you plan to visit India for your cancer care, your medical history, lab results, scans, and prior treatments can all be assessed by oncologists prior to arrival.
It depends on your type of cancer and the kind of treatment you require.
Read: Cancer Treatment Cost in India
Final Thoughts
Cancer is not a single disease. Rather, it is an extensive group of diseases characterized by uncontrolled growth of cells, with every type of cancer acting uniquely.
Identifying the specific kind and stage of cancer is the initial part to figuring out the course of action for treatment. Tests for diagnosing may entail imaging scans, biopsies, pathologies, and even molecular analyses. Treatment might consist of surgery, chemotherapy, radiation treatments, immunotherapy, targeted therapies, hormone therapy, or a combination of these modalities.
For you or a loved one facing this diagnosis, speaking with a knowledgeable oncology team about both the condition and your treatment will be vital. In certain instances, seeking another opinion may prove helpful prior to treatment.