title: Cytotoxic therapy-induced D-xylose malabsorption and invasive infection during remission-induction therapy for acute myeloid leukemia in adults.
abstract: OBJECTIVE
  To study the sequential changes in the intestinal absorption of an oral pentose probe, D-xylose, in patients receiving therapy for untreated acute myeloid leukemia (AML), and to correlate these changes to infectious morbidity.
  
  
  METHODS
  Serial D-xylose absorption studies were conducted in 110 consecutive adult patients admitted to a university-affiliated tertiary care hospital for remission-induction therapy for untreated newly diagnosed AML. Serial serum D-xylose levels were obtained 1 hour after a 5-g oral dose of D-xylose at baseline and weekly for 4 weeks until marrow recovery. These results were correlated with invasive infection using multivariate techniques.
  
  
  RESULTS
  The mean (+/- SEM) serum D-xylose levels were 0.88 +/- 0.03, 0.69 +/- 0.03, 0.58 +/- 0.02, 0.53 +/- 0.02, and 0.73 +/- 0.02 mmol/L at baseline and weeks 1 to 4, respectively (P < .0001, analysis of variance [AN-OVA]). Time to malabsorption varied with induction regimen (P = .007, log-rank test). Bloodstream infections during week 2 correlated with malabsorption (P = .007). Neutropenic enterocolitis correlated independently with induction regimen (P = .009), malabsorption at week 2 (P = .02), and the development of candidemia (P = .005). Hepatosplenic fungal infection correlated with induction regimen (P = .03), malabsorption at week 2 (P = .02), and fever at diagnosis (P = .003). Malabsorption was unrelated to the duration of severe neutropenia and the administration of parenteral nutrition.
  
  
  CONCLUSIONS
  Serial D-xylose absorption studies in subjects with AML produced a characteristic profile of cytotoxic therapy-related damage to the functional integrity of the intestinal epithelium that was regimen dependent, myelosuppression independent, and predictive for invasive infectious complications. Further study to validate these observations appears warranted.
authors.affiliation: Department of Medicine, University of Manitoba and The Manitoba Cancer Treatment and Research Foundation, Winnipeg, Canada.
authors.forename: E J
authors.initials: EJ
authors.lastname: Bow
authors.forename: R
authors.initials: R
authors.lastname: Loewen
authors.forename: M S
authors.initials: MS
authors.lastname: Cheang
authors.forename: T B
authors.initials: TB
authors.lastname: Shore
authors.forename: M
authors.initials: M
authors.lastname: Rubinger
authors.forename: B
authors.initials: B
authors.lastname: Schacter
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000970:Antineoplastic Agents / Q000009:adverse effects*; D005260:Female; D006801:Humans; D007408:Intestinal Absorption / Q000187:drug effects; D015470:Leukemia, Myeloid, Acute / Q000188:drug therapy* / Q000378:metabolism*; D008286:Malabsorption Syndromes / Q000139:chemically induced* / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D009181:Mycoses / Q000139:chemically induced / Q000378:metabolism; D009503:Neutropenia / Q000139:chemically induced / Q000378:metabolism; D012074:Remission Induction; D012307:Risk Factors; D014994:Xylose / Q000097:blood / Q000493:pharmacokinetics*
chemical_list: D000970:Antineoplastic Agents; D014994:Xylose