A boy with failure to thrive and isolated pancreatic amylase deficiency is
described. Immunoprecipitation confirmed only salivary isoamylase in duoden
al fluid at ages 20 and 33 months. Because normal pancreatic amylase messen
ger RNA was detected LS reverse-transcriptase polymerase chain reaction in
the fluid, failure of the normal maturation of pancreatic amylase secretion
may explain the deficiency.