Ocrelizumab
| Evidence Level: L5 | Predicted Indications: 5 |
Table of Contents
Ocrelizumab: HER2 positive breast carcinoma
One-Sentence Summary
Ocrelizumab is an anti-CD20 monoclonal antibody originally used to treat progressive multiple sclerosis. The TxGNN model predicts it may be effective for HER2-positive breast carcinoma, but there are currently 0 registered clinical trials and 0 publications directly supporting this indication. This is a model prediction only.
Quick Overview
| Item | Content |
|---|---|
| Original Indication | Not recorded in the local data |
| Predicted New Indication | HER2 positive breast carcinoma |
| TxGNN Prediction Score | 0.9989 |
| Evidence Level | L5 |
| Australia Market Status | Listed on the PBS Schedule (1 of 1 items) – TGA (ARTG) registration status is not included in this data |
| Number of PBS Items | 1 (valid: 1) |
| Recommended Decision | Hold |
Why is This Prediction Reasonable?
Currently, detailed mechanism of action data is not available in the data compiled for this report. Ocrelizumab is known to be a humanised anti-CD20 monoclonal antibody that selectively depletes CD20-expressing B cells. Its efficacy in multiple sclerosis is well established.
No mechanistic link between CD20-directed B-cell depletion and HER2 positive breast carcinoma is supported by the data compiled. The high score (0.9989) comes from the TxGNN model (deep learning) and may reflect similarities the model learned between related diseases, not biological evidence. Other breast cancer subtypes (progesterone-receptor positive and negative, luminal A or B, normal breast-like) received near-identical scores. This suggests a shared model signal across the breast cancer group rather than disease-specific evidence.
Clinical Trial Evidence
Currently no related clinical trials registered for this indication.
Literature Evidence
Currently no related literature available for HER2-positive breast carcinoma.
For context, 18 records were retrieved for the related prediction “breast tumour luminal A or B”. The ten listed all concern multiple sclerosis or other autoimmune and B-cell topics, and none addresses breast cancer. Examples are the pivotal ocrelizumab trials in primary progressive MS (PMID 28002688) and relapsing MS (PMID 28002679). This match appears to be an artefact of drug-name retrieval and should not be read as support for any oncology indication.
Australia Market Information
| ARTG Number | Product Name | Dosage Form | Approved Indication |
|---|---|---|---|
| ARTG 11237K | Ocrevus | Solution concentrate for I.V. infusion, 300 mg in 10 mL | Not available in the data compiled |
Safety Considerations
- Drug Interactions: Interaction screening returned 100 entries. The main ones shown are:
- Moderate: corticosteroids (hydrocortisone, prednisolone, prednisone, dexamethasone, betamethasone, budesonide, triamcinolone), radiopharmaceuticals (iobenguane I-131, ibritumomab tiuxetan, tositumomab, samarium-153 lexidronam), and albendazole, pentamidine and levamisole.
- Minor: zinc salts (sulfate, acetate, gluconate, chloride).
For warnings and contraindications, please refer to the TGA-approved Product Information (PI).
Conclusion and Next Steps
Decision: Hold
Rationale: The prediction rests entirely on the TxGNN model score. There are no clinical trials, no relevant literature, and no supported mechanistic link between CD20 B-cell depletion and HER2-positive breast carcinoma. Established HER2-directed therapies already exist for this disease.
To proceed, the following is needed:
- Mechanism of action data (for example from DrugBank) and a defined biological hypothesis linking CD20 or B cells to HER2-positive breast cancer
- Preclinical or translational evidence, then registered clinical studies
- The TGA-approved PI (warnings, contraindications, approved indications) to complete safety screening
- Review of the immunosuppression and infection risks in a cancer population, including interactions with chemotherapy and corticosteroids
Disclaimer
This content is for research purposes only and does not constitute medical advice. Clinical validation is required before any clinical application.