Table 2: Comparison between RA and carcinomatous polyarthritis features [2-4,9].
Rheumatoid Arthritis | Carcinomatous polyarthritis |
Sub-acute onset | Rapid onset |
Female sex predominance | Male sex predominance |
Younger age | Older age (except LORA) |
Symmetrical involvement | Asymmetrical involvement |
Upper joints (hands and wrists) | Lower joints |
Seropositive for ACPAs | Seronegative for ACPAs (may be positive for ANAs and RF) |
Erosions on X-ray and deformities | No erosions or deformities |
No constitutional symptoms | Constitutional systemic symptoms (fever, weight loss) |
Responsive to standard therapy | Refractory to corticosteroids |