an approved drug in the US and EU for the treatment of osteoporosis. The pharmaceutical industry analyst Evercore has remarked that "it could wipe out setrusumab's economics", as romosozumab is priced more cheaply than a drug for a rare disease would be, claiming that it will be "vital" to Ultragenyx's profit margins to prove its setrusumab is more efficacious than romosozumab for OI. A clinical trial evaluating romosozumab's efficacy in OI began in September 2020 and as of September 2021 is ongoing. Ultragenyx predicts that its phase 2/3 trials for setrusumab will be completed in 2026. Prevention As a genetic disorder, the mainstay of twenty-first century prevention of osteogenesis imperfecta is based on preventing affected individuals from being born in the first place. Genetic counseling can help patients and their families determine what types of screening, if any, are right for their situation. Patients can consider preimplantation genetic diagnosis after in vitro fertilization to select fertilized embryos which are not affected. Common mutations which cause OI may be caught by exome sequencing and whole genome sequencing. If a pregnancy is already in progress, the procedure of amniocentesis may be undergone to see if the fetus is affected. If affected, it is up to the family to consider whether or not they want to terminate the pregnancy and try again—raising questions of medical ethics and a woman's right to choose. Without intervention, patients with the most common mutations causing osteogenesis imperfecta have a 50% chance per gestation of passing on the disorder, as these mutations are inherited in an autosomal dominant pattern of Mendelian inheritance. Those with the rare autosomal recessive forms of OI have a 25% chance of passing on the disorder. Genetic testing of the affected members of the family can be used to determine which inheritance pattern applies. As OI type I may be difficult to detect in a newborn child, the cord blood of the child can be tested to determine if it has been passed on if the family has already rejected the more invasive genetic screening methods. In more severe cases, the diagnosis may be able to be done via ultrasound, especially if OI is already a possibility. An ethical concern with prenatal screening for OI often arises when parents inquire as to how severely affected their child will be—such questions are as yet difficult to answer conclusively. If a non-affected person has already had