This clinical trial is focused on studying a condition known as PIK3CA-Related Overgrowth Spectrum (PROS). This is a rare disorder that causes abnormal growth in various parts of the body due to changes in the PIK3CA gene. The treatment being tested in this study is a medication called alpelisib, which is taken as a film-coated tablet. The purpose of the study is to evaluate the long-term safety and tolerability of alpelisib in patients who have previously participated in a related study.
Participants in this study will take alpelisib orally, which means it is swallowed in tablet form. The study will monitor patients over a period to see how they respond to the treatment and to check for any new or worsening side effects. The study will also look at other health aspects, such as changes in laboratory values, vital signs, and heart function. Additionally, the study will assess growth, bone and dental development, and sexual maturation in applicable age groups.
The study will gather information on the number of healthcare visits or hospitalizations due to PROS, as well as any other treatments or surgeries related to the condition. This information will help researchers understand the long-term effects of alpelisib and its impact on the symptoms and complications associated with PROS. The study is expected to continue until 2027, providing valuable insights into the management of this rare condition.



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