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Cancer cells are continuously increasing cell that divides in an uncontrolled manner. The rapid division is due to the loss of cell cycle regulation. It results in the formation of tumor mass by uncontrolled growth of the cells.

Mitotic spindle formation is the process of formation of spindles that separates the chromosomes. The drugs that can inhibit the cancer cell mechanism have a more profound tool than the disruption of mitotic spindle fiber formation.

The effectiveness of vinblastine is not related to the disruption of spindle fiber formation.

Therefore, the given statement is false.

Vinblastine is the drug that is a cell cycle phase-specific medication. It particularly acts on the microtubular protein and stops the metaphase stage of the cell cycle. Cyclins are substance that binds to cyclin-dependent kinases and promotes the various levels of the cell cycle.

Vinblastine acts by reducing or suppressing cyclin production, which in turn stops the cell cycle. The vinblastine must suppress the activity of cyclin to control the growth of cancer cells.

Therefore, the given statement is true.

Myosin is the protein that is involved in the movement of muscles cells. The denaturation affects the muscle texture. The cleavage furrow formation is the last step of the cell cycle known as cytokinesis.

Vinblastine activity is related to the metaphase of the cycle.

Therefore, the given statement is false.

The blockage of DNA synthesis is the primary therapeutic strategy used to treat diseases like cancer. An example of a DNA synthesis inhibitor is Zidovudine.

Vinblastine is not a DNA inhibitor. It acts in the other stage of the cell cycle.

Therefore, the given statement is false.