Lymphoid atrophy (lymph node, thymus, GALT) and immunosuppression-related skin lesions/infections in rats
“Treatment-related atrophy of the mesenteric lymph node, thymus, and GALT/Peyer’s patches were observed in male and female rats at all doses and attributed to immune suppression based on the pharmacology of leniolisib.”
✓ VerifiedFDA multi-discipline review, p. 40Source ↗
Biodistribution & persistence
Moderate tissue distribution with high skin affinity; highest in bile, hair follicle, liver, intestinal wall, kidney and melanin-containing structures
“In radioactive studies, leniolisib was moderately distributed into tissues (Vss of 1.06 L/kg in rats and 0.657 L/kg in monkeys) with a high skin affinity. After a single oral dose of 10 mg/kg to male rats, the highest exposures were found in the bile, hair follicle, liver, intestinal wall, kidney as well as in melanin-containing structures.”
✓ VerifiedFDA multi-discipline review, p. 38Source ↗
Modality-specific risk
Embryofetal toxicity (eye malformations), immunosuppression and QTc prolongation
“Leniolisib-related external, visceral, and skeletal malformations were observed in fetuses in the HD group. Most notably, malformations of the eye were observed in fetuses from 6/20 litters.”
✓ VerifiedFDA multi-discipline review, p. 44Source ↗