Having the right diagnosis always helps both the patient and the doctor. The doctor is able to give the right treatment and the patient recovers earlier as well. Typically, We visit a medical practitioner or doctor when we have unusual symptoms. Most doctor understand these symptom by talking with the patient about his or her medical history and proceeds to order a few screening tests to confirm or reject their diagnosis. The case with cancer is no different and doctors around the globe conduct tests to confirm cancer.
For most cancers, a biopsy is the only way to make a definite diagnosis. A biopsy is the removal of a small amount of tissue for study in the lab and confirm the presence of cancerous cells.
There are many types of biopsy that are done based on the type of patient and the disease
This test is usually done to detect blood disorders and/or presence of blood cancer.These two tests are similar in nature and are ordered at the same time by the doctor.
The human bone marrow has both a solid and a liquid part. A bone marrow aspiration removes a sample of the fluid with a needle while the bone marrow biopsy removes a small amount of solid tissue using a needle. Typical blood cancers include leukemia, lymphoma, or multiple myeloma.
Commonly,the extraction of the tissue and fluid is using done on the lower back (i.e. the pelvic bone). The doctor usually applied anaesthesia to numb the area and takes the sample.
This test includes collecting a small amount of tissue using a very think hollow needle attached to a syringe. Typically this is used for a mass that can be felt through the skin (e.g. lumps on the breast etc.). This is also used with a image-guided biopsy.
In a core needle biopsy uses a larger needle to remove a larger sample of tissue compared to a fine needle biopsy. The process is similar across these two biopsies.
Sometimes there is a need to collect a larger sample or multiple same from the same organ/site. To achieve this , a suction is used to collect a tissue sample through a specially designed needle. This helps the doctor to not insert the needle more than one time and also collect multiple or larger samples from the same biopsy site with this method.
When a tumor is deep inside the body and cannot be felt by hands, this biopsy method is advised. A needle is guided to the location with the help of an imaging technique (MRI, Ultrasound etc.) to extract the tissue for tests.
An image-guided biopsy can be done using a fine needle, core, or vacuum-assisted biopsy. The type of scan used depends on the location, amount of tissue needed, and other factors.
The term "incision" means to "a surgical cut made in skin or flesh" . As the name suggests, in this approach, the doctor makes a small incision in the skin to collect a sample of tissue from underneath the skin.
An excisional biopsy is the removal of an entire suspicious area or tumor from the body. This type of biopsy is common for a suspicious change on the skin. It is also sometimes used for a small lump under the skin when it can be easily removed. However, fine needle aspiration or a core biopsy are more common for lumps that cannot be seen or felt through the skin.
This approach is common for skin cancers where the doctor scrapes out tissue from the surface of the skin and sends it for testing
In the punch biopsy approach, a circular tool ("imagine an ice-cream scooping process") is inserted through the skin and a sample of the skin and tissue below it is extracted for testing.
An endoscope is a thin, lighted, flexible tube with a camera that helps doctors to view the inside of the body like bladder, abdomen, stomach for abnormality. It can also be used to take tiny samples of the tissue using forceps (which are also a part of the endoscope) Endoscopes are inserted into the body through the mouth or through a tiny surgical incision.
PET-CET or PET/CT stands for Positron emission tomography–computed tomography. This is a nuclear medicine technique which combines in a single machine two scanners – a a positron emission tomography (PET) scanner and an x-ray computed tomography (CT) scanner.
These two scanners capture images in a sequential manner which are then super-posed to create a single image. That helps doctor understand the metabolic and biochemical activity in the body. At the beginning of the test, the patient is given an a biologically active module called as tracer in a safe dosage which emits radioactive rays. The system detects these radioactive rays and a 3D image of tracer concentration within the body are then constructed by computer analysis.
A commonly used tracer is fludeoxyglucose (FDG),an analogue of glucose. Concentrations of tracer imaged indicate tissue metabolic activity as it corresponds to the regional glucose uptake and help explore the possibility of cancer metastasis (i.e., spreading to other sites) and other abnormalities in the body
MRI stands for Magnetic resonance imaging. It is a medical imaging technique which is used to form images of the body and also get an understanding of the physiological processes of the body. MRI is used for medical diagnosis, disease staging and follow up examinations without exposing the body to radiation. This machine operates using strong magnetic fields and radio waves to generate images of the organs in the body. The machine does not involve x-rays, which distinguishes it from computed tomography (CT machine). Even with the improvements in medical technology, MRIs are still seen as superior to CT because of the absence of X-ray component. Note: Some patients with medical implants or with other non-removable metals inside the body might be unsuitable for undergoing an MRI examination.
Ultrasound is also a medical imaging technique. It is also called as sonography and ultrasonography. Working on the doppler principle, the system uses high frequency sound waves to create pictures of internal organs. Echo of sound waves bounce differently from an abnormal tissue and a healthy tissue helping the doctor to detect potential tumors and other abnormalities.
Colonoscopy is an examination of the colon. Colon is sometimes also referred to as the large intestine. The method constitutes an endoscopic examination of the colon with a camera (either a CCD camera or a fiber optic camera) which is set up on a flexible tube passed through the anus. Based on the visual diagnosis , it also provides doctor an an opportunity of biopsy or removal of suspected lesions/ulcerations/polyps as small as 1mm. The sample removed are studied to determine presence of cancer.
Mammography is used for the early detection of breast cancer. The process uses low energy x-ray to examine the human breast for diagnosis and screening. Breast cancer is typically associated with determining the presence of characteristic masses or micro-calcification in cancerous breast tissue.
The output of a mammography test is called a Mammogram. The results of a Mammogram are often expressed in terms of the BI-RADS Assessment Category, often called a "BI-RADS score." Typically scores are on a scale from 0-6 (0 = Incomplete 1 = normal, 2 = benign, 3 = indeterminate, 4 = suspicious of malignancy, 5 = malignant 6= Known proven malignancy).
It is advised to have mammograms at a periodic frequency to allow for an early detection of breast cancer. The below table shows the frequency at which a mammogram should be conducted by age.
|Recommendations by Age||Frequency|
|40 to 44||Women in this age bracket should have the choice to start annual breast cancer screening with mammograms (x-rays of the breast) if they wish to do so.|
|45 to 54||Recommended once every year|
|55 and older||
Note:If you have a family history of Breast Cancer (mother or sister), it is recommended to start mammograms 10 years earlier than the age the relative was diagnosed.
A Pap smear, also called a Pap test, is a screening procedure for cervical cancer among women. It tests for the presence of precancerous or cancerous cells on the cervix. The cervix is the opening of the uterus.
During the routine procedure, cells from your cervix are gently scraped away and then examined for abnormal growth.
|Recommendations by Age||Pap Smear Frequency|
|< 21 Years old, not sexually active, no known risk factor||Test is typically not needed|
|21-29||Once every 3 years|
|30-65||Once every 3-5 years if your Pap smear and HPV test are negative|
|65 and older||You may no longer need Pap smear tests; talk to your doctor to determine your needs|
The dictionary definition of a biomarker is " a naturally occurring molecule, gene, or characteristic by which a particular pathological or physiological process, disease, etc. can be identified. "
In other words, our body continuously secretes biological “markers” that can act as a measurable indicator a biological state or condition. Biomarkers are found in bloodstream, urine or body tissues. Changes in the level of biomarker can indicate presence of one or more types of abnormality including cancer. Tumor markers can be produced by both tumor cells and adjacent non-tumor cells in the body.
There are now drugs that help target specific biomarkers/tumor markers. Determining if the cancer is of a particular type (based on the overexpression a biomarker), the doctor can prescribe a particular treatment that is likely to be more effective than only for you.
|Pancreatic Cancer||Elevated levels of leucine, valine (type of amino acids)|
|Lymphoma / Leukimia||
|Skin Cancer (Melanoma)||BRAF|
|Gastric (Stomach/GI Cancer)||HER2|
FISH stands for Fluorescence in situ hybridization.
This test helps doctors visualize and map the genetic material in the cells of a patient's body including specific genes or portion of genes. Changes in the genes within a cancer cell can make it to :
There are now drugs that help target specific proteins. Based on the overexpression of specific proteins,the doctor can prescribe a particular treatment that is likely to be more effective than only for you.
E.g. If the patient has an overexpression of HER2 protein, then the drug Herceptin?Herclon(trastuzumab) is known to be more likely effective for the patient.
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