CPP Disability: Anyone who is not stage IV apply for benefits?

I'd appreciate hearing from you if you applied for CPP disability in relation to your breast cancer and don't have stage IV cancer. Did you have a longer-than-usual (whatever "usual" is) treatment and recovery period that prevented you from working? Did you have pre-existing illness or conditions, or particularly bad treatment side effects? Were you successful in receiving benefits for the treatment and recovery period? 

For over 1.5 years, from the time of surgery through chemo and radiation and until I got off taxmoxifen, I was physically and mentally incapable of doing any type of work. I was denied benefits and the only reference to cancer in the reasons for decision was that there was no evidence of recurrent cancer. That makes me wonder if benefits are ever provided for "first-time" breast cancers that aren't stage IV.

There seemed to be more interest in my pre-existing conditions, but I'd always managed to earn a living despite them. They weren't what stopped me from working, breast cancer and its treatment were ... likely it was a cumulative effect but the bottom line was I couldn't work for a prolonged period of time after my breast cancer treatment began. That was the first time in my life I haven't managed to support myself and I've had to live on credit, so I was highly motivated to work had I been able.

Thanks.