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Summary of all reported cases of spontaneous regression of RCC from 1971 to 2011
| Type of regression | Organs | Number of reports | Number of cases |
|---|---|---|---|
| Regression of primary tumour | kidney | 4 | 5 |
| Delayed metastases | lungs | 5 | 5 |
| pancreas | 1 | 1 | |
| Regression of metastases | lungs | 27 | 30 |
| lungs, adrenal gland | 1 | 1 | |
| lungs, bones | 1 | 1 | |
| lungs, brain | 1 | 1 | |
| lungs, pleura | 1 | 1 | |
| lungs, scalp | 1 | 1 | |
| liver | 4 | 4 | |
| bones | 2 | 2 | |
| bones, liver | 1 | 1 | |
| choroid | 2 | 2 | |
| pleura | 2 | 2 | |
| brain | 1 | 1 | |
| pancreas | 1 | 1 | |
| total | 55 | 59 |
