Duzan's thesis was the first treatise exclusively on cancer in childhood. He was able to collect 182 cases. All 182 cases were of pediatric sarcoma: 70 of the eye, 45 of the kidney, 11 of the testicle, 8 of the prostate, and the remainder divided among the bones, tongue, abdomen, brain and dura mater, lung, pancreas, liver, tonsils, rectum and stomach. 
Digital facsimile from wellcomecollection.org at this link.