( tmaintaining antibody reductions over ...)La Jolla Pharmaceutical Provides Update on Interim Antibody Results,From Riquent Lupus Phase 3 Trial,Health

t maintaining antibody reductions over time in individual patients was associated with a significantly reduced renal flare rate. The updated data indicate that the higher the Riquent dose, the greater the consistency of response and the greater the magnitude of this response. While more than twice as many 900 mg-treated patients (62%) as 100 mg-treated patients (25%) had a consistent 20% reduction, nearly seven times as many 900 mg-treated patients (42%) had a consistent 40% reduction, compared with 100 mg-treated patients (6%). Nearly twice as many patients on 900 mg as 300 mg had a consistent 50% reduction, but no patients on 100 mg or placebo achieved this level of consistent reduction. A consistent reduction is defined as a patient whose percent antibody reduction exceeded a specified level at weeks 4, 6 and 8.

Tolerability

To date, Riquent has been well tolerated in the ongoing Phase 3 study. The adverse event profile for all patients in the study, including those treated with the 300 mg and 900 mg doses, does not appear to differ from that seen in previous studies where 100 mg of Riquent was the treatment dose.

These data will be presented at the 8th International Congress on SLE in Shanghai in May 2007.

Phase 3 Study Design

The Phase 3 study is designed to assess the ability of Riquent treatment to prevent or delay the time to renal flare in lupus patients with a history of renal disease and with antibodies to dsDNA. A lupus renal flare is a potentially life-threatening increase in inflammation targeting the kidney. A renal flare often requires treatment with immunosuppressive agents which can have severe side effects.

The global study is expected to enroll approximately 730 patients who will be treated weekly with Riquent or placebo. Equal numbers of patients will be treated with 300 mg per week, 900 mg per week or placebo for 12 months. Patient enrollment in this international study recommenced in the third quarter
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