| Syndrome | Patients affected % | Causative protein or antibody |
| Hyponatraemia/SIADH | 15 | Arginine vasopressin or atrial natriuretic peptide |
| Ectopic corticotropin syndrome | 2–5 | Corticotropin |
| Lambert–Eaton myasthenic syndrome | 3 | Voltage-gated calcium channel antibody |
| Acromegaly | <1 | GHRH |
| Gynaecomastia | <1 | |
| Hypercoagulability | <1 | |
| Thrombocytosis | <1 | |
| Encephalomyelitis/subacute sensory neuropathy | <1 | Anti-Hu, amphiphysin, CV2 |
| Cancer-associated retinopathy | <1 | Anti-recoverin |
| Dermatomyositis | <1 | |
| Acanthosis palmaris, erythema gyratum repens | <1 | |
| Nephrotic syndrome | <1 |
SIADH: syndrome of inadequate antidiuretic hormone; GHRH: growth hormone-releasing hormone.