Ustekinumab is a fully human Immune Globulin Gk (IgGk) monoclonal antibody against the common p40 subunit of interleukin-12 and interleukin-23, which are implicated in the pathogenesis of inflammatory bowel disease. Its efficiency to induce and maintain clinical response in patients with anti TNF resistant Crohn's disease has been proved in several clinical trials, and the profile of safety of this treatment was good, but the investigators have few data about biological characteristics of patients treated by Ustekinumab, particularly about ustekinumab through levels and rate of patients developing anti ustekinumab antibodies during the induction and maintenance stages, and no predictive factors of clinical response have been identified yet. The aim of this study will be to assess the evolution of biological markers of inflammation and ustekinumab trough levels and antibodies, in responders and non responders patients treated by ustekinumab, in order to identify predictive factors of clinical response. The investigators will perform a prospective observational study, including the patients followed in the University hospital center of Lyon and treated by ustekinumab for a moderate to severe Crohn's disease (with a HBI score≥4 ). All the patients included will have been previously treated by at least one anti TNF and/or Vedolizumab, with specified criteria for a primary non response, a secondary loss of response or unacceptable side effects. Then, clinical and biological data will be collected for each patient at the inclusion, and then at weeks 4, 8, 16, 24: HBI score, sides effects, extra intestinal manifestations, steroids withdraw, CRP, calprotectin, ustekinumab trough levels and ustekinumab antibodies. The investigators will compare responding and non responding patients at week 16 (end of the induction period) according to these data. The hypothesis the investigators state is that an early and significant decrease of the inflammation markers in blood and stools associated with a high ustekinumab through level in blood is associated with a clinical response at week 16 in the patients treated by ustekinumab
Study Type
OBSERVATIONAL
Enrollment
18
The clinical response is defined as a decrease in the Crohn's Disease Activity Index (CDAI) score ≥ 100 points or a decrease in the HBI score ≥ 3 points.
Centre hospitalier Lyon Sud
Pierre-Bénite, France
Measurement of serum ustekinumab trough concentrations (expressed in microg/mL) at week 8.
Dosage of ustekinumab through level and ustekinumab antibodies: one 4ml blood sample
Time frame: Week 8
Measurement of serum ustekinumab trough concentrations (expressed in microg/mL) at week 4.
Dosage of ustekinumab through level and ustekinumab antibodies: one 4ml blood sample
Time frame: Week 4
Measurement of serum ustekinumab trough concentrations (expressed in microg/mL) at week 16.
Dosage of ustekinumab through level and ustekinumab antibodies: one 4ml blood sample
Time frame: Week 16
Measurement of serum ustekinumab trough concentrations (expressed in microg/mL) at week 24.
Dosage of ustekinumab through level and ustekinumab antibodies: one 4ml blood sample
Time frame: Week 24
Dosage in blood at week 4
-Inflammation markers are evaluated : Dosage of CRP and leucocytes in blood: two 4ml blood sample
Time frame: Week 4
Dosage in blood at week 8
-Inflammation markers are evaluated : Dosage of CRP and leucocytes in blood: two 4ml blood sample
Time frame: Week 8
Dosage in blood at week 16
-Inflammation markers are evaluated : Dosage of CRP and leucocytes in blood: two 4ml blood sample
Time frame: Week 16
Dosage in blood at week 24
-Inflammation markers are evaluated : Dosage of CRP and leucocytes in blood: two 4ml blood sample
Time frame: Week 24
Dosage of calprotectin in stools at week 4
-Inflammation markers are evaluated : Dosage of calprotectin in stools: one about 50 mg stools sample
Time frame: Week 4
Dosage of calprotectin in stools at week 8
-Inflammation markers are evaluated : Dosage of calprotectin in stools: one about 50 mg stools sample
Time frame: Week 8
Dosage of calprotectin in stools at week 16
-Inflammation markers are evaluated : Dosage of calprotectin in stools: one about 50 mg stools sample
Time frame: Week 16
Dosage of calprotectin in stools at week 24
-Inflammation markers are evaluated : Dosage of calprotectin in stools: one about 50 mg stools sample
Time frame: Week 24
Physical evaluation at week 4
Clinical evaluation is realized by a medical visit with physical examination
Time frame: Week 4
Physical evaluation at week 8
Clinical evaluation is realized by a medical visit with physical examination
Time frame: Week 8
Physical evaluation at week 16
Clinical evaluation is realized by a medical visit with physical examination
Time frame: Week 16
Physical evaluation at week 24
Clinical evaluation is realized by a medical visit with physical examination
Time frame: Week 24
Clinical evaluation at week 4
Clinical evaluation is realized by a medical visit with evaluation of: * the efficiency of the treatment: evaluation of well being, abdominal pain, stools numbers per day, presence or not of peri anal lesion, arthralgia, fever * the tolerance/potential side effects of the treatment: infections, headache, skin rash, nausea, allergic reaction, or any clinical manifestation that could be imputed to the treatment
Time frame: Week 4
Clinical evaluation at week 8
Clinical evaluation is realized by a medical visit with evaluation of: * the efficiency of the treatment: evaluation of well being, abdominal pain, stools numbers per day, presence or not of peri anal lesion, arthralgia, fever * the tolerance/potential side effects of the treatment: infections, headache, skin rash, nausea, allergic reaction, or any clinical manifestation that could be imputed to the treatment
Time frame: Week 8
Clinical evaluation at week 16
Clinical evaluation is realized by a medical visit with evaluation of: * the efficiency of the treatment: evaluation of well being, abdominal pain, stools numbers per day, presence or not of peri anal lesion, arthralgia, fever * the tolerance/potential side effects of the treatment: infections, headache, skin rash, nausea, allergic reaction, or any clinical manifestation that could be imputed to the treatment
Time frame: Week 16
Clinical evaluation at week 24
Clinical evaluation is realized by a medical visit with evaluation of: * the efficiency of the treatment: evaluation of well being, abdominal pain, stools numbers per day, presence or not of peri anal lesion, arthralgia, fever * the tolerance/potential side effects of the treatment: infections, headache, skin rash, nausea, allergic reaction, or any clinical manifestation that could be imputed to the treatment
Time frame: Week 24
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