Prostate Restored
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Staging varies with the type of cancer. The term stage 5 isn't used with most types of cancer. Most advanced cancers are grouped into stage 4.
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Learn More »This page was reviewed under our medical and editorial policy by Bradford Tan, MD, Chair, CTCA Department of Pathology and Laboratory Medicine. Staging plays an important role in both diagnosing and treating cancer. Staging refers to the way doctors describe the characteristics of an individual cancer. These characteristics include: The cancer’s location and size
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Learn More »Stage 4, or metastatic or advanced cancer: Cancer cells have spread beyond nearby tissue and into lymph nodes and parts of the body, including organs, potentially far from the original site. What is stage 0 cancer? Staging for some cancers, such as breast cancer, includes stage 0 or carcinoma in situ. With these cancers, staging ranges from 0 to 4. Stage 0 is used to describe a clump of abnormal cells that hasn’t spread into neighboring tissue or elsewhere, sometimes called pre-cancer. Surgery often is able to remove such growths. What is stage 5 cancer? Staging varies with the type of cancer. The term stage 5 isn’t used with most types of cancer. Most advanced cancers are grouped into stage 4. An exception is Wilms tumor, or nephroblastoma, a childhood cancer that originates in the kidneys. Stage 5 Wilms tumors are those that affect both kidneys. How is cancer staged? For the majority of adult cancers, the TNM system is used to determine staging. It categorizes cancer progression for most solid tumors that spread to other sites in the body. Other staging systems are used for cancers that don’t fit those criteria. TNM staging system TNM stands for tumor, node and metastasis. The system uses numbers and letters to describe these three aspects of a cancer: T: A numeral from 1 to 4 following the letter T describes the size of the primary, or original, tumor. Ascending numbers correspond to increasingly larger tumors that have grown into neighboring tissue. In some instances, a lowercase letter follows the number to offer more detail about the cancer. A lowercase “m” indicates the presence of multiple tumors. Lowercase “i-s,” or “Tis,” means the abnormal cells are in situ and that the tumor hasn’t grown into nearby tissue. T0 means no sign of a tumor was found, and TX means the tumor couldn’t be measured or no information is available on it. N: A numeral from 0 to 3 following the letter N signifies, in ascending order, whether no, few or many lymph nodes in the region surrounding the tumor have been affected. N0 means no cancer was found in nearby lymph nodes, and NX indicates no information available. M: A numeral following the letter M indicates whether cancer has spread, or metastasized, to other sites in the body. These sites include lymph nodes outside the region where the primary tumor grew. M0 means it hasn’t spread; M1 means it has. Clinical or pathological stages may be designated in the TNM system by a lowercase “c” or “p” before the capital “T.” Similarly, if a cancer is restaged, a lowercase “y” may be added if this occurs post-therapy or a lowercase “r” may be added for restaging when cancer recurs. Tumor grade Grade refers to how normal or abnormal the cells and tissue structure in the tumor appear when examined under a microscope. The amount of cell division seen in the sample also is considered. The pathologist checks tumor samples gathered via biopsy or during surgical removal of a tumor. If it resembles healthy tissue with normal structure and distinct groups of different types of cells, it’s considered to be “well differentiated,” and the tumor is low-grade. Low-grade tumors generally grow slowly and may lead to a better prognosis. Samples with cells and tissue structure that appear abnormal are termed “poorly differentiated,” and the tumor is considered high-grade. These cells typically grow and spread faster and may need immediate, more aggressive therapy. Grade scores run from low-grade, G1, to undifferentiated, G4. When the grade can’t be decided, the tumor is given a score of GX. Some cancers have their own grading system. Prostate cancer, for example, is described using the Gleason scoring system, and breast cancer is characterized by the Nottingham grading system.
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Read More »Biomarkers or tumor markers Biomarkers are substances found in high levels in cancer patients. These tumor markers may be found in blood, urine, body tissues or tumors, and they may influence staging with some cancers. One example is that men with prostate cancer have high levels of the prostate-specific antigen (PSA). For some cancers, these markers may be more useful than facts garnered from other staging factors when deciding treatment. Some tests may indicate whether tumor cells have certain chemical receptors shown to respond to certain treatments, such as drugs that target those receptors or the substances to which they attach. Breast cancer patients may be tested to determine whether cancer cells have receptors for the hormones estrogen and progesterone. The genetics of the tumor may help the care team determine which treatments to recommend. Researchers have discovered many genes involved in various cancers, and drugs have been developed to specifically target many of these cancers. Other factors involved in staging A patient’s age, the tumor location and the type of cell from which the cancer grew are some other factors that may influence cancer staging and treatment.
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