“…The clinical response in myasthenia gravis is poor (Henson, Stern, and Thompson, 1965), and no changes in serum y-globulin levels occur, after treatment of thymoma associated with hypo-y-globulinaemia (Gafni et al, 1960;Wollheim, Belfrage, Coster, and Lindholm, 1964). Nor has thymectomy affected serological evidence of autoimmune phenomena in the occasional case reported, even in the presence of a good clinical response (Birch, Cooke, Drew, London, Mackenzie, and Milne, 1964). It remains a possibility, however, that the treatment which all but one of the present patients had had prior to this study affected the serological findings.…”