In 1934 the first cases of cystic fibrosis of the pancreas were described in a thesis written under his direction.

Sweat chloride concentration in children with allergy and with cystic fibrosis of the pancreas.

Guido Fanconi describes a connection between celiac disease, cystic fibrosis of the pancreas and bronchiectasis.

Dorothy Hansine Andersen describes the characteristic cystic fibrosis of the pancreas and correlates it with the celiac, respiratory and intestinal diseases prominent in the condition, also first hypothesizing that cystic fibrosis is a recessive disorder.

In 1938 Dorothy Hansine Andersen published an article, "Cystic Fibrosis of the Pancreas and Its Relation to Celiac Disease: a Clinical and Pathological Study," in the American Journal of Diseases of Children.

His most significant article was a 1935 article in the American Journal of Diseases of Children titled "The Pathology of Steatorrhea" where he was the first to recognize congenital steatorrhea (cystic fibrosis of the pancreas) as a separate disease unrelated to other steatorrheas, including celiac disease.

She was the first to describe the characteristic cystic fibrosis of the pancreas and to correlate it with the lung and intestinal disease prominent in CF. She also first hypothesized that CF was a recessive disease and first used pancreatic enzyme replacement to treat affected children.