Hi Angela and welcome,
As Chris and Olivia have already said... things will get better for you over the coming months and you will eventually understand the clinical terms and acronyms.
I would also recommend Jessica Wapner's book 'The Philadelphia Chromosome'.... maybe a little down the line as you become less panicked and more confident that TKI therapy will work for you as it has done for thousands of others.
The Ph+ cells in your peripheral blood have obviously been dealt with very well by nilotinib- I assume you are taking 150 mg twice a day (total 300 mg daily)? Nilotinib is a 2nd generation TKI (alongside dasatinib, bosutinib and ponatinib) and recently published data from studies of this TKI in newly diagnosed chronic phase CML shows that it is very successful in getting a fast and deep molecular response... in other words as with the other drugs I mention above, it hits the Ph+ cells hard and fast- which is the most effective strategy for long term survival and control of the disease.
Just to answer your question about the various acronyms you have come across.
CHR - Complete haematologic response (only normal cells now seen in the peripheral blood)
MCyR - Major cytogenetic response - (Ph+ cells have reduced to 35% or less in the marrow)
CCyR - Complete cytogenetic response - Ph+ cells are no longer detectable by cytogenetic/FISH testing, and molecular testing by qPCR show the abnormal gene called BCR/ABL1, (the fusion gene responsible for causing CML and found in cells positive for the PH+ chromosome) has reduced to less than 1%.
MR - molecular response - the fusion gene BCR/ABL1 has reduced even further towards 0.1% (this level is also referred to as MR3 and/or a 3 log reduction from 100% Ph+ baseline at diagnosis - a reduction equivalent to a 1000 fold)
MRD - molecular residual disease- this is what most of us live with, preferably with % of BCR/ABL1 at anything from 0.1% to 0.001% and anything in between- although some individual do not reach that low a level and still maintain response very well over the long term without adverse events.
As long as you take your TKI therapy as prescribed the fusion gene will be kept at a very low molecular level where it will not cause any problem in the longer term. In other words, the majority of people will be able to live out their normal lifespan.
I know this may be overly technical at this stage in your CML 'experience', but it is a good idea to just read and read again until you get the terms stuck in your head.
Have some faith- there are by now tens of thousands of people worldwide who have been successfully treated with TKI therapy over the last 15 years. You are not on your own by any means.
A note on carers.... it does not mean that you need a carer in the normal sense of the word- rather it refers to partners/spouses/family members who are also affected by their loved ones diagnosis of CML. The meeting is also to support and inform them.
Hope this has helped reassure you in some way.
Which hospital are you being treated at?
Sandy