Final answer:
In normal cell division, there are two spindle poles, but in malignant tumor cells, errors can result in multiple spindle poles, leading to incorrect chromosome distribution and aneuploidy.
Step-by-step explanation:
The number of spindle poles in malignant tumor cells can vary due to abnormalities in the cell division process. Normally, during cell division or mitosis, there should be two spindle poles, forming from centrosomes and creating a mitotic spindle structure that separates the newly copied DNA into two daughter cells.
However, in malignant tumor cells, errors in the spindle assembly checkpoint can lead to mitotic disrupters, which might cause multiple spindle poles to form.
This condition, known as multipolar spindles, can result in the incorrect distribution of chromosomes during cell division, leading to aneuploidy and further contributing to cancer progression.