KYV-101 is an experimental therapy being studied to see how it affects patients over a long period of time after they have received it.

Lupus Nephritis – This condition occurs when the immune system attacks the kidneys due to systemic lupus erythematosus. It causes inflammation within the kidney’s filtering units. As the disease progresses, the inflammation can lead to damage in the kidney tissues. This process can result in the leakage of proteins and blood into the urine. Over time, the damage may affect how well the kidneys filter waste from the blood.

Systemic Sclerosis – This is an autoimmune disorder characterized by the hardening and tightening of the skin and connective tissues. It is caused by the body’s immune system attacking healthy tissues, leading to excessive amounts of collagen production. The disease often begins with skin thickening and can spread to internal organs like the lungs, heart, or digestive tract. As it advances, the affected tissues become increasingly stiff.

Myasthenia Gravis – This is a chronic autoimmune neuromuscular disorder. It occurs when the immune system mistakenly attacks the communication points between nerves and muscles. This interruption prevents muscles from receiving signals correctly. The condition typically manifests as muscle weakness that worsens with activity and improves with rest. Over time, the weakness can affect various muscle groups throughout the body.

Rheumatoid Arthritis – This is an autoimmune and inflammatory disease that primarily affects the joints. The immune system attacks the synovium, which is the lining of the membranes that surround the joints. This causes the lining to thicken, leading to swelling and discomfort. As the disease progresses, the inflammation can cause bone erosion and joint deformity. It often affects multiple joints symmetrically on both sides of the body.

Stiff Person Syndrome – This is a rare neurological disorder characterized by progressive muscle stiffness and aching. It is caused by an immune system malfunction that affects the nerve cells controlling muscle movement. The stiffness typically begins in the abdomen and trunk before spreading to the limbs. This can lead to involuntary muscle spasms triggered by unexpected stimuli. The condition results in increased difficulty with movement and posture.