What is mitotic activity in breast cancer?
MAI is defined as the numbers of mitotic figures in a given area of tumor [23]. Traditionally, MAI is scored on glass slides using light microscopy where mitosis is counted in 10 high power fields (40× magnification) or per unit area (2 mm2) in the most active part of the tumor [21], [23], [24].
What is the mitotic index of breast cancer?
Design: Mitotic index (MI) was defined as the mitotic cell count per 10 high-power fields (HPFs), an area 0.183 mm(2). Two to 6 replicate sets of 10 HPFs were counted from 328 invasive breast carcinomas.
Why would the mitotic index be relevant to a diagnosis of breast cancer?
Mitotic Activity Index (MAI) is an important independent prognostic factor and an integral part of the breast cancer grading system. Thus, correct estimation of this prognostically relevant feature is essential for guiding treatment decision and assessing patient prognosis.
What does high mitotic count mean?
The higher the mitotic count, the more likely the tumor is to have metastasized (spread). The logic is that the more cells are dividing, the more likely they will invade the blood or lymphatic vessels and thus spread around the body.
What does mitotic mean in medical terms?
The ordinary division
Mitosis: The ordinary division of a body cell (a somatic cell) to form two daughter cells, each with the same chromosome complement as the parent cell.
What is a mitotic activity?
Listen to pronunciation. (my-TAH-tik ak-TIH-vih-tee) Having to do with the presence of dividing (proliferating) cells. Cancer tissue generally has more mitotic activity than normal tissues.
What is a normal mitotic index?
The mitotic index is the number of cells undergoing mitosis divided by the total number of cells. A typical figure of mitotic index includes statements like “10 mitotic figures are noted per 10 high power fields” followed by “4 mitotic figures noted per 50 high power fields.”
What is the significance of mitotic index?
The mitotic index (percentage of cells in mitosis at any time) provides a measure of the capacity of cells to divide and of the rate of cell division. It is used to identify the sites of growth within a tissue and to determine which cell types are dividing.
What is mitotic activity mean?
What is a good mitotic count?
Mitotic activity should be reported as an average over 10 hpf (i.e., using the 40× objective on most conventionally configured microscopes). Enough fields should be counted to determine a statistically valid average. Generally, 30 hpf are sufficient, but occasionally 50 or more hpf may be needed.