Hi Dennis,
I absolutely agree that humour has a place and did not mean to imply you were being flippant. I also agree that you missing 1 week last year would not have affected your long term prognosis- or short term PCR results- I only meant to underline that it is the regular missing of the 'daily dose' consistently over several months that is likely to have an effect on overall outcomes and the best control of the disease.
The 3 doses in a month comment is taken from a paper produced by D. Marin et al at Hammersmith.
Long-term Adherence to Imatinib Critical for Achieving Molecular Response- Marin D, et al. J Clin Oncol.2010;28:2381-http://jco.ascopubs.org/content/28/14/2381.full.pdf
They studied a cohort of patients over some time and tried to measure their level of adherence. They concluded the following:
Regularly missing more than three daily doses in one month is likely to affect your response to therapy. Patients in whom adherence to therapy was monitored and in whom the adherence rate was greater than 90%, meaning that they took more than 90% of their prescribed doses, did substantially better at achieving lower molecular levels of remission MR3; MR4.5.
Of course, we are all individuals and have differences in metabolism etc. As you know through the STIM and TIDEL studies (now being studied further through DESTINY and other studies) it has been shown that a small but significant number of patients can safely stop therapy and maintain TFR(treatment free remission), but for the majority this might not be possible.
The Hammersmith study showed that a certain level of any particular TKI must be maintained if the PH clone and the Leukaemic stem cell is to be effectively controlled over the longer term. Given the half life of TKI therapies- how long they stay at a clinically effective level in the plasma over 24 hrs- means that for the majority, to be sure of getting the best possible clinical effect, the plasma level of a TKI must stay within that certain parameter over 24 hours. If there is less than 90% adherence to therapy over months then that will eventually show up in molecular response rates shown by PCR results etc.
Best wishes,
Sandy