Other rare tumors
The International Ovarian and Testicular Stromal Tumor Registry collaborates closely with the International Pleuropulmonary Blastoma Registry. Form more information about the International PPB Registry, please visit ppbregistry.org
In addition to cases of gonadal stromal tumors, the OTST Registry collects information on rare ovarian and testicular stromal tumors which cannot be classified as gonadal stromal tumors but which are pathologically and/or clinically similar. Small cell ovarian tumors of the hypercalcemic type are among the rare and understudied tumors eligible for inclusion. The International OTST Registry collects these cases using methods similar to those used for the stromal tumors.