The cartilage in some patients' knee joints is severely damaged and does not repair itself. Researchers tested a treatment using stem cells taken from donated human embryos.
The treatment group received the stem cell treatment as well as usual care. The other group received usual care only.
| Group | Number of patients | Observation period / months | Number whose walking ability improved | Number who developed a tumour | Number who developed a viral infection |
|---|---|---|---|---|---|
| Stem cell treatment and usual care | 80 | 12 | 49 | 2 | 1 |
| Usual care only | 80 | 12 | 31 | 0 | 0 |
Evaluate whether the embryonic stem cell treatment should be offered routinely to patients with this knee damage.
104 exam-style questions on AQA GCSE Biology 1.2 Cell division, covering 1.2.1 Chromosomes, 1.2.2 Mitosis and the cell cycle, and 1.2.3 Stem cells. Each one has a worked solution and a mark scheme showing where the marks go.