Cyclin E
A protein that is part of a molecular network that controls the cell cycle.
There are a large number of cyclin proteins involved in this endeavor.
Cyclin E specifically regulates the transition from the G1 phase to the S phase of the cell cycle.
A high level of cyclin E accelerates the transition of the cell through the G1 phase.
Cyclin E is of prognostic value in breast cancer.
High levels of cyclin E in the tumor correlate with a poor outcome, whereas low levels correlate with a good outcome.