Autologous chondrocyte transplantation: a phase 1 study protocol to validate the safety and feasibility of a new advanced cell therapy product for articular cartilage repair in Brazil
Bibliographic record
Abstract
Background: Membrane-assisted autologous chondrocyte transplantation is considered the gold standard surgical technique to treat greater than two millimetres diameter cartilage lesions in the knee in patients after conservative treatment failure. However, this technique is only available in developed countries of North America, Europe and Japan. According to Brazilian law, it is considered an advanced cell therapy product. There is currently no product of this type enabled for clinical use in Brazil. Following the request of the Brazilian regulatory agency (ANVISA), this phase 1 study was developed. The objective is to access feasibility and safety of a new membrane-assisted autologous chondrocyte product. Methods: Three participants with a larger than two millimetres articular cartilage lesion in the distal femur or the patella, which did not improve their symptoms with conservative treatment, will be submitted to an arthroscopically assisted cartilage biopsy. After isolation and expansion in a good manufacturing practices facility, chondrocyte seeded collagen membranes will be surgically inserted in the lesion and fixed with fibrin glue. The follow-up period will last 1 year. Primary outcome will be incidence and severity of complications according to NCI-CTCAE version 4.0. Secondary outcomes will be Western-Ontario McMaster Universities Osteoarthritis Index scale, International Knee Documentation Committee subjective scale and magnetic resonance observation of cartilage repair tissue magnetic resonance scale. Conclusions: This study, together with previous preclinical results and international experience, will allow patients in Latin America to have access to this advanced cell therapy. Trial Registration: Brazilian registry of clinical trials RBR-6fgy76 (http://www.ensaiosclinicos.gov.br/rg/RBR-6fgy76/). Ethical approval: CAAE: 73911617.2.0000.0071.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.009 | 0.004 |
| Meta-epidemiology (narrow) | 0.003 | 0.001 |
| Meta-epidemiology (broad) | 0.003 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.002 | 0.002 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.002 | 0.003 |
| Insufficient payload (model declined to judge) | 0.013 | 0.003 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".