Abstract
To the Editor: The conclusion of Fialkow et al. (N Engl J Med 297:696–698, 1977), based on their G-6-PD analysis of parathyroid tissue, that parathyroid hyperplasias and adenomas "may...be similar biologically" is hardly justified by their presented data. As Fialkow himself points out elsewhere, "before concluding that a tumor...contains both enzyme types (B & A) and thus has a multiple cell origin, the possibility must be considered that the actual tumor cells have a single-enzyme phenotype, and that the second enzyme type is due to the presence of non-neoplastic cells admixed with the tumor cells."1 Specifically, their estimates of less . . .

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