WALTHAM, Mass.--(BUSINESS WIRE)--Altus Pharmaceuticals Inc. (NASDAQ: ALTU) today announced that patient dosing in its Phase 2 trial for ALTU-238 in growth hormone deficiency pediatric subjects began on June 2, 2009. ALTU-238 is a long-acting, extended-release formulation of recombinant human growth hormone (rhGH, somatropin), which is being developed utilizing Altus’ proprietary protein crystallization technology. ALTU-238 is a ready-to-use liquid suspension of crystallized rhGH that preserves the structure of the rhGH molecule without the need for pegylation, polymerization, or encapsulation and enables administration through a fine gauge needle. The Phase 2 ALTU-238 pediatric trial is being conducted in approximately 18 clinical sites in the U.S. and targets enrolling 36 growth hormone deficient pediatric patients. ALTU-238 has been studied in a series of Phase 1 and Phase 2 studies in healthy and GH deficiency adults.