In Kaczor v. Vanchem, Inc. (262 AD2d 1041, 691 NYS2d 831 [4th Dept 1999]) the court excluded expert testimony that chemical exposure caused chronic fatigue syndrome. The only evidence supporting such a link between the two was evidence from a doctor that fumes from chemical exposure cause increased liver enzyme levels which can cause chronic fatigue syndrome and that plaintiff had such increases in liver enzyme levels after the incident with the fumes. However, the doctor did not offer any basis to substantiate the assertion that high enzyme levels are caused by chemical fumes. Without any basis the evidence was excluded.