Increased gastrointestinal absorption of large molecules in patients after 5-fluorouracil therapy for metastatic colon carcinoma.

Abstract:

:Chemotherapeutic agents may damage gastrointestinal epithelium and thereby impair the mucosal barrier to bacteria and their products. In order to obtain an objective measurement of gastrointestinal permeability to large molecules, we measured urinary excretion of [14C]polyvinylpyrrolidone administered p.o. (mean molecular weight 11,000) and tobramycin (molecular weight 467) in ten patients receiving 5-fluorouracil therapy for metastatic cancer of the colon. Base-line absorption of [14C]polyvinylpyrrolidone was 0.013 to 0.048% of the administered dose. Dose-related increases in absorption (range, two to 20 fold) occurred after 5-fluorouracil administration, but the dose response differed markedly between individuals. Absorption was maximal 8 to 15 days after the start of therapy, was correlated in time but not necessarily in severity with the presence of gastrointestinal symptoms, and was unaffected by oral nonabsorbable antibiotics. Tobramycin excretion was 8.5 times greater than [14C]polyvinylpyrrolidone excretion, but the two were highly correlated in simultaneous determinations (r, 0.93; p, < 0.001). With the exception of an episode of Escherichia coli bacteremia, infections coincided not with maximal [14C]polyvinylpyrrolidone absorption but with maximal granulocytopenia 17 to 24 days after the start of therapy. The gastrointestinal absorption of polyvinylpyrrolidone provides an objective measurement of mucosal integrity which may have applications in assessing the gastrointestinal toxicity of other cytotoxic agents.

journal_name

Cancer Res

journal_title

Cancer research

authors

Siber GR,Mayer RJ,Levin MJ

subject

Has Abstract

pub_date

1980-10-01 00:00:00

pages

3430-6

issue

10

eissn

0008-5472

issn

1538-7445

journal_volume

40

pub_type

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