Cancer involves abnormal cells growing uncontrollably, invading nearby tissues, and spreading to other parts of the body through metastasis.
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Once tissue is obtained, the pathologist uses advanced techniques to identify the specific cell lineage. Since B cells and T cells look very similar under a standard microscope, molecular tagging is required. Immunohistochemistry (IHC) involves applying antibodies to the tissue slide that are tagged with a color. These antibodies bind to specific proteins (antigens) on the surface of the cells.
For example, CD20 is a protein found on the surface of most B cells. If the tumor cells stain positive for CD20, the diagnosis is narrowed to a B-cell lymphoma. CD3 is a marker for T cells. CD30 and CD15 are classic markers found on the Reed-Sternberg cells of Hodgkin Lymphoma. This “protein fingerprinting” is essential for correct classification.
Flow cytometry is a fluid-based version of this analysis. Fresh biopsy cells are suspended in a liquid and passed through a laser. The machine analyzes thousands of cells per second, detecting multiple markers simultaneously. This can determine whether the B cells are monoclonal (all clones of a single original cancer cell) by assessing light-chain restriction (kappa or lambda). If all cells express only kappa light chains, it strongly suggests malignancy, as a normal immune response would produce a mix of kappa and lambda light chains.
Imaging plays a dual role in lymphoma: staging (determining where the disease is) and response assessment (determining if treatment is working). The standard modality is FDG PET/CT. This technology combines two images: a CT scan, which provides detailed anatomical pictures of bones and organs, and a PET scan, which maps metabolic activity.
Cancer cells, particularly aggressive lymphomas, have a high metabolic rate and consume large amounts of glucose. The patient is injected with a radioactive sugar molecule (FDG). The lymphoma cells eagerly absorb this sugar, causing them to “light up” brightly on the PET scan. This allows doctors to distinguish between active cancer and scar tissue, and to find small nodes that might look normal in size on a CT scan but are biologically hyperactive.
The Deauville Score is a 5-point scale used to interpret PET scans, comparing the brightness of lymph nodes to that of the liver and blood pool. A lower score indicates a metabolic complete response. PET scans are typically done at diagnosis, sometimes midway through treatment (interim PET) to gauge effectiveness, and at the end of treatment to confirm remission.
Staging describes the extent of the disease spread. Lymphoma uses the Ann Arbor Staging System, initially developed for Hodgkin Lymphoma but also applied to NHL. It divides the disease into four stages based on the location of involved lymph nodes relative to the diaphragm (the muscle separating the chest from the abdomen).
Stages are further modified by letters. “A” indicates the absence of systemic symptoms. “B” means the presence of B symptoms (fever, night sweats, weight loss). “E” indicates localized extranodal extension. “X” is sometimes used to denote a “bulky disease” (a large tumor mass) that may require radiation therapy. Unlike solid tumors, Stage IV lymphoma is often still curable.
While the stage tells us where the cancer is, it does not fully predict how the patient will do. To estimate prognosis and tailor treatment intensity, clinicians use risk stratification models. The most widely used for aggressive B-cell lymphoma is the International Prognostic Index (IPI).
The IPI scores patients based on five adverse risk factors:
Each factor gets one point. Patients are grouped into Low, Low Intermediate, High Intermediate, or High risk categories. This score helps oncologists decide if a standard treatment is sufficient or if a more aggressive protocol or clinical trial is warranted. Variations exist for other lymphomas, such as the FLIPI for Follicular Lymphoma and the IPS for Hodgkin Lymphoma.
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Stage III means cancer is in the lymph nodes, both above and below the diaphragm (like the neck and the groin). Stage IV means the cancer has spread outside the lymphatic system into major organs like the liver, lungs, or bone marrow. However, both are often treated with systemic chemotherapy.
Lymphoma cells often hide in the bone marrow, even if blood tests look normal. A bone marrow biopsy involves taking a small core of bone from the hip to look for these cells. If lymphoma is found in the marrow, it usually automatically classifies the disease as Stage IV, which can change the treatment plan.
Bulky disease refers to a single tumor mass that is very large, typically defined as being greater than 7 to 10 centimeters in diameter. Bulky tumors are more complex for chemotherapy to penetrate completely, so patients with bulky disease often receive radiation therapy to that specific area after chemotherapy is finished.
LDH (Lactate Dehydrogenase) is an enzyme found in almost all body cells. When cells are damaged or destroyed, they release LDH into the blood. In lymphoma, a high LDH level suggests a large tumor or a rapidly growing tumor, indicating a higher risk of disease.
Yes. PET scans detect high metabolic activity. While cancer is highly active, so is infection and inflammation. A healing wound, a recent surgical site, or an active infection (such as pneumonia) can also “light up” on a PET scan, potentially mimicking cancer. Doctors correlate PET findings with clinical history to avoid misinterpretation.
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