Can high levels of CA 19-9 in the blood be caused by something other than pancreatic cancer?

My mom was diagnosed with pancreatic cancer about 9 months ago and underwent the Whipple surgery to remove the tumor, along with most of her pancreas. She underwent chemotherapy and radiation therapy and seemed to react well to both (several CT scans have indicated no signs of tumors elsewhere in her body). However, about 2-3 weeks ago, she began experiencing a constant pain in her abdomen, which has persisted. She's gone to a few different doctors, and they can't exactly figure out what it might be - they think maybe just a pulled muscle. However, she went to her oncologist last week and found out that her CA 19-9 level shot way up. Is there something else, besides the cancer and that could be related to her stomach pain that may be causing this?

Pancreatic cancer is one of the most horrible of cancers...it is quick growing and very hard on a person due to it affects the digestion of foods...and anorexia and nausea sometimes goes hand in hand with it...this is what I found online...can't find my lab book, but maybe at the library or a bookstore (with medical books) ...look for a lab results book..ask the oncologist what it means too...

What does the test result mean?
Low amounts of CA 19-9 can be detected in a certain percentage of healthy people, and many conditions that affect the liver or pancreas can cause temporary elevations.

Moderate to high levels are found in pancreatic cancer, other cancers, and in several other diseases and conditions. The highest levels of CA 19-9 are seen in excretory ductal pancreatic cancer -- cancer that is found in the pancreas tissues that produce food-digesting enzymes and in the ducts that carry those enzymes into the small intestine. This tissue is where 95% of pancreatic cancers are found.

Serial measurements of CA 19-9 may be useful during and following treatment because rising or falling levels may give your doctor important information about whether the treatment is working, whether all of the cancer was removed successfully during surgery, and whether the cancer is likely returning.
http://www.labtestsonline.org/understand...