By Dennis Thompson

MONDAY, March 6, 2017 (HealthDay News) -- A small-scale has cast doubt upon the potential usefulness of an anti-inflammatory drug to treat .

Doctors had hoped that () -- a medication for -- also could be used to relieve symptoms of .

But after a month of daily anakinra injections, a group of 25 women reported chronic symptoms as severe as those experienced by a control group receiving shots, researchers reported.

"In this carefully and well-controlled study, we were unable to show a beneficial effect," said senior researcher Dr. Jos Van der Meer.

"Of course, this is a disappointment," added Van der Meer, chair of internal medicine at Radboud University Nijmegen Medical Center in the Netherlands.

Anakinra treats by blocking interleukin-1, a biochemical produced by the immune system to create .

Patients with chronic fatigue syndrome have been found to have increased levels of interleukin-1 in their bloodstream.