The paper reviews the literature on the role of the above proteins in the mechanisms of cell cycle regulation and presents data on changes in protein expression in dynamics of cell cycle. The significance of studies dealing with the expression of these proteins, which, along with the assessment of a cell population growth fraction, allow one to characterize the rate of cell proliferation that under malignant growth is the determinant of cell proliferative status, which has a great impact on tumor progression, is discussed. The data on the diagnostic value of these proteins as an independent predictor for a broad spectrum of tumors are considered.
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