That's a really good question regarding abnormal mammograms and PAPs.
As it happens, about 40% of mammograms show up with some sort of abnormal result, and due to this I figure at least 4 out of 10 of my mammograms will have some sort of issue. I am seldom disappointed by this expectation, as fibrocystic changes often drives them around the bend, and I am always having to reassure my new primary care doctor that such-and-such on a manual exam is perfectly normal for me and nothing to panic about.
Since, as Jo so aptly pointed out, there is an increased risk of cancer with systemic sclerosis, we can't take anything for granted, even though we also need to take everything with a grain of salt in order to keep our heads on straight, as we have to deal with so many more tests -- and test results -- than the average person.
I do wish I had a dollar for every woman I encountered in the imaging waiting areas, who were panic stricken and often in tears over needing to have their mammogram retaken or who needed further testing. It seems the clinics I've been to don't bother to explain that is a NORMAL part of the process and that very few abnormalities are truly abnormal and cancerous, in the end. Us folks with chronic illness are used to the drill, and accustomed to all sorts of false alarms, so we tend to develop a lot more coping skills. But my goodness, even the slightest issue can, understandably, throw a perfectly healthy person having a routine exam into a total tailspin.
So yes, most of us should have experienced some abnormal test results, and then on top of that, there would be more abnormal test results that are eventually determined to be more significant, among scleroderma patients, although this would also remain as just a small sliver of those who flunked the initial screenings.