Rapamycin Plus Methylprednisolone Versus Methylprednisolone Alone in Active, Moderate-to-severe Graves' Orbitopathy.

Project basis:

Thyroid-associated ophthalmopathy (GO), a vision-threatening autoimmune disease, is the most common extrathyroidal manifestation of Graves disease. At present, GO treatment is still dominated by hormone therapy. From 2010 to 2018, the effective rate of GO hormone shock during moderate to severe activity in our hospital was about 52%. The long-term massive use of hormones can lead to iatrogenic Cushing's syndrome, peptic ulcer, insomnia, delusions, abnormal behavior, pathological fractures, and secondary infections. Therefore, regardless of the disease itself or the treatment method, GO seriously affects the physical and mental health of patients, and optimizing the existing diagnosis and treatment plan has always been a research hotspot in the field. Autoimmunity-induced inflammatory response increased orbital extracellular matrix secretion, and increased fat volume is the cornerstones of the pathogenesis of GO. Previous studies have shown that the PI3K-AKT-mTOR pathway is involved in the synthesis and secretion of extracellular matrix and adipogenesis in orbital fibroblasts. We have demonstrated that RAPA can inhibit orbital collagen and fat deposition in a previous hyperthyroid exophthalmos mouse model. In another small sample (20 patients) study of refractory GD patients, it was also confirmed that methimazole combined with RAPA can effectively reduce thyroid hormone levels, shorten drug withdrawal time, and restore Th17 compared with methimazole alone. /Treg balance. At the same time, there were no adverse reactions in the patients during up to 1 year of follow-up. Therefore, this study intends to carry out large-scale clinical research based on the previous small sample research. A total of 140 patients with GO were enrolled from the endocrinology clinic of our hospital and other hospitals and were randomly divided into two groups. They were treated with methylprednisolone pulse alone and methylprednisolone pulse combined with rapamycin respectively. The clinical and immunological indicators were used to evaluate the effect of RAPA on GO patients. Efficacy and safety, bringing new hope to GO patients.

Research purposes:

To compare the efficacy and safety of rapamycin 2mg/day orally for 24 weeks combined with methylprednisolone pulse therapy and methylprednisolone pulse therapy alone in the treatment of moderate to severe active eye disease.

main target: Rapamycin 2mg/day orally*24 weeks combined with methylprednisolone pulse therapy and methylprednisolone pulse therapy alone in moderate to severe active GO was effective and safe at 24 weeks.

Secondary goals:

1. The effective rate of rapamycin combined with methylprednisolone pulse and methylprednisolone pulse in the treatment of moderate to severe active GO at 36 weeks;
2. At 36 weeks, the recurrence rate of GO in moderate to severe active stage in the treatment of rapamycin combined with methylprednisolone pulse and methylprednisolone pulse therapy;
3. At 24 weeks, the effects of rapamycin and methylprednisolone on GO exophthalmos, CAS, GO-QoL, intraocular pressure, orbital content volume (estimated by MRI), eye cleft width, eye movement, visual acuity, the impact of TRAb.
4. 36 weeks of rapamycin and methylprednisolone shock on GO exophthalmos, CAS, GO-QoL, intraocular pressure, orbital content volume (estimated by MRI), eye cleft width, eye movement, Visual acuity, the effect of TRAb.

Explore goals:

1. To explore the effect of rapamycin combined with methylprednisolone pulse therapy on Th1, Th2, Th17, and other effector T cells and immune regulatory Treg cells in GO patients;
2. To explore the effect of rapamycin combined with methylprednisolone pulse on OF adipogenesis and extracellular matrix secretion.

This study was a multicenter, randomized, controlled study. Study Design: The study was divided into four phases: screening period, dual-drug combination period, monotherapy period, and follow-up period.

Screening period: Experiment-1-0 weeks. According to the inclusion criteria and exclusion criteria, patients with moderate to severe active GO who met the research requirements were selected as the research objects. After obtaining the informed consent of the patients, the research objects were randomly assigned to the control group and the experimental group in a ratio of 1:1. Before formal treatment, peripheral blood was collected for the determination of immune cells and adipogenesis markers.

Dual-drug treatment period: Week 1 to Week 12 of the study. The control group was given methylprednisolone shock control. Experimental group: Based on methylprednisolone pulse therapy, oral administration of rapamycin 2 mg/day was given.

Monotherapy period: From the 13th week to the 24th week of the study, all subjects discontinued methylprednisolone pulse therapy. The experimental group continued to take rapamycin 2 mg orally.

Follow-up period: Week 25 to Week 36. Follow-up observed the improvement of GO eye activity, severity, and quality of life in patients.

Methylprednisolone pulse therapy regimen: Methylprednisolone 500 mg/week*6 weeks + 250 mg/week*6 weeks, the cumulative dose of methylprednisolone is 4.5 g. Proton pump inhibitors and vitamin D and calcium were given as needed during the dual-drug therapy period. Follow-up at Week 0, Week 6, Week 12, Week 24, and Week 36 to assess GO eye disease activity, severity, and GO-QoL improvement. Before the screening, blood was collected at the 2nd visit (1 week + 3 days), the 3rd visit (6 weeks + 3 days), and the 4th visit (12 weeks + 3 days) for safety evaluation. On the 2nd visit (1 weekend + 3 days) and the 4th visit (12 weeks + 3), blood was collected for the determination of rapamycin plasma concentration. After a random assignment at the first visit (0 weeks), the third visit (6 weeks + 3), and the fifth visit (24 weeks + 3 days), samples were collected for mechanism research.

During the study, if the patient developed vision-threatening GO or other conditions, they were required to withdraw from the study.

Research objects:

A total of 140 untreated patients with moderate-to-severe active GO (moderate-severe: 2021 EUGOGO CSS grading criteria; active stage (CAS) ≥ 3), aged 18-70 years.

data analysis: Main objective analysis: Summarize the number and percentage of responding cases at 24 weeks of treatment, using a logistic regression analysis model, with the experimental group as the fixed effect, compare the difference in the compliance rate between groups, and calculate its Odds ratio and 95% confidence interval.

Secondary objective analysis: The logistic regression analysis model was still used for the categorical variables in the secondary objective, and the covariance analysis model was used for continuous variables such as proptosis, GO-QoL, intraocular pressure, and orbital content volume (estimated by MRI). (ANCOVA) analysis.

Safety evaluation: Analysis of safety indicators based on safety analysis set, including adverse events, laboratory tests, physical examination of vital signs (including weight) and electrocardiogram, etc.

Determination of sample size:

The effective rate of MMF combined with methylprednisolone in the treatment of GO was 71%, and we assumed that the effective rate of rapamycin combined with methylprednisolone was 75%. β=0.2, α=0.05, the effective rate of the methylprednisolone treatment group is about 50%, and the effective rate of methylprednisolone combined with the rapamycin treatment group is about 75%. With a preset loss to follow-up rate of 30%, it is planned to enroll 140 patients, 70 in each treatment group.