As far as I know, there is no way we can tell, no "litmus" test.
I have PPMS after being DX with RRMS at first, and a now an MS Ambassador (public advocate), and am on the WEB Every day (retired and bored, but busy)....
My understanding is that the ABC Drugs work for some, some drugs suit some people, best case is less regular 'attacks', less in number, slower progression?? How do they know ? Statistics, test results, placebo trials, all the normal methods of comparison...
and you know what they say about Statistics, and damn lies,.... it's all in the interpretation.
My explanation when speaking to groups is.....
You may as well try, it may even work, nobody really knows whats going to happen.... a positive mental attitude helps, (I laugh a lot, usually at myself....)
A long comment... but when you have read about and seem changes like I have, I have real trouble believing anyone that claims to actually "know" anything...... if he 'knows' what is going to happen, he would be the first. He may have an idea, he may be reading signs, he may think one direction is likely.
For me, there is no way he "knows anything", it is all based on the statistics....
