Which of the following two statements are correct?

A post surgery concentration of $<35/$mL CA$125$ rules out the possibility of recurrence.

Recurrence was never found in patients where the CA$125$ was below the cut$-$off value post surgery.

Recurrence was found to occur in patients where the CA$125$ rose to over three times the cut$-$off value post surgery.

Increasing the analytical sensitivity of CA$125$ methods may increase the ability to detect recurrence.

Consecutive measurements of CA$125$ post surgery enable the prediction of disease recurrence $.$