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Clinical significance of circulating immune complexes in ‘lone’ cryptogenic fibrosing alveolitis and those with associated connective tissue disorders

The clinical, radiographic and physiological features, and progression rates of forty unselected patients with cryptogenic fibrosing alveolitis (CFA) have been studied in relation to serum immune complexes measured by a C1q binding technique. Twenty (50%) had levels greater than normal. Those with associated connective tissue disorders (twenty‐four) had a higher frequency of raised C1q binding than those with ‘lone’ CFA (sixteen) (63% compared to 31%). As observed previously in this group, those with associated disorders also had higher titres of immune complexes. Twelve of thirteen with polyarthritis had immune complexes and a considerably shorter duration of disease compared with those without joint symptoms (P<0.0l).