One hundred fifty-one patients with primary biliary cirrhosis (PBC) grouped into four strata based on entry serum bilirubin ( < 2 mg/dL vs. 2 md/dL or greater) and liver histology (stages I, II vs. stages III, IV-Ludwig criteria) were randomized within each stratum to ursodiol or placebo given in a single dose of 10 to 12 mg/kg at bedtime for 2 years. Placebo- (n = 74) and ursodiol- treated (n = 77) patients were well matched at baseline for demographic and prognostic factors. Ursodiol induced major improvements in biochemical tests of the liver in strata 1 and 2 (entry bilirubin < 2), but had less effect on laboratory tests in patients with entry serum bilirubin of > or +2 (strata 3 and 4). Histology was favorably affected by ursodiol in patients in strata 1 and 2 but not in strata 3 and 4. Ursodiol enrichment in fasting bile obtained at the conclusion of the trail was approximately 40% and comparable in all strata. Thus, differences in ursodiol enrichment of the bile acid pool do not explain better responses of laboratory tests and histology found in patients with less advanced PBC. Patients treated will ursodiol tended to develop a treatment failure less frequently that those who received placebo, particularly in strata 1 and 2 (ursodiol 42%, placebo 60%, P = .078). Development of severe symptoms (fatigue/pruritus) and doubling of serum bilirubin were reduced significantly in ursodiol-treated patients.(ABSTRACT TRUNCATED AT 250 WORDS)

One hundred fifty-one patients with primary biliary cirrhosis (PBC) grouped into four strata based on entry serum bilirubin (<2 mg/dL vs. 2 mg/dL or greater) and liver histology (stages I, 1 1 vs. stages 111, IV-Ludwig criteria) were randomized within each stratum to ursodiol or placebo given in a single dose of 10 to 12 mgkg at bedtime for 2 years. Placebo-(n = 74) and ursodioltreated (n = 77) patients were well matched at baseline for demographic and prognostic factors. Ursodiol induced major improvements in biochemical tests of the liver in strata 1 and 2 (entry bilirubin <2), but had less effect on laboratory tests in patients with entry serum bilirubin of 2 2 (strata 3 and 4). Histology was favorably affected by ursodiol in patients in strata 1 and 2 but not in strata 3 and 4. Ursodiol enrichment in fasting bile obtained at the conclusion of the trial was approximately 40% and comparable in all strata. Thus, differences in ursodiol enrichment of the bile acid pool do not explain better responses of laboratory tests and histology found in patients with less advanced PBC. Patients treated with ursodiol tended to develop a treatment failure less frequently than those who received placebo, particularly in strata 1 and 2 (ursodiol42%, placebo WO, P = .078). Development of severe symptoms (fatigue/pru-Abbreviations: PBC, primary biliary cirrhosis; M-W, Mann-Whitney. From the 'University of Texas Southwestern Medical Center a t Dallas, Dallas, Tx; '

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In these studies, the role of T helper and T cytotoxic cells in generating intestinal graft-vs.-host disease (GVHD) was examined. Treatment of C57BL/6J (B6) splenocytes with L-leucyl-L-leucine methyl ester (Leu-Leu-OMe) selectively removes natural killer cells, cytotoxic T lymphocyte (CIL) precursors, and the capacity to cause lethal GVHD in irradiated B6xDBA/2 Fl (B6D2Fl) mice while preserving T helper cell function. Neither control nor Leu-Leu-OMe-treated DBA/2 donor spleen and bone marrow cells were found to induce lethal GVHD in B6D2F1 recipients. However, extensive colonic GVHD developed in B6D2F1 recipients of DBA/2 bone marrow and spleen cells. Enteropathic GVHD in DBA/2 -* B6D2F1 mice was reduced in severity after anti-L3T4 + C treatment of donor cells, and was eliminated by anti-Thyl.2 + C or the combination of anti-L3T4 and anti-Lyt2 + C treatment of the donor cell inoculum. However, neither antiLyt2 + C, Leu-Leu-OMe, nor anti-Lyt2 + C and Leu-LeuOMe treatment of donor cells significantly decreased severity of gut GVHD. Leu-Leu-OMe treatment of DBA/2 or B6 SpC was comparably effective in preventing in vitro or in vivo generation of B6D2Fl-specific CiL. These findings, therefore, demonstrate that histologically severe enteropathic GVHD does not require participation of CIL and is not always associated with high mortality rates.