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Gynecologic Oncology 2018-Nov

Identifying the need to refine the potential patient risk factors for niraparib-induced thrombocytopenia.

Straipsnius versti gali tik registruoti vartotojai
Prisijungti Registracija
Nuoroda įrašoma į mainų sritį
Judith A Smith
Tran Le
Grace A Martin
Anjali Gaikwad
Chenchen H Sun
Elizabeth K Nugent
Joseph A Lucci

Raktažodžiai

Santrauka

OBJECTIVE

Niraparib is a poly (ADP-ribose) polymerase inhibitor (PARP) approved for use in maintenance therapy for ovarian cancer that is associated with the unpredictable grade 3/4 thrombocytopenia. This study was conducted to refine patient dosing recommendations for niraparib based upon clinical practice observations of grade 3/4 thrombocytopenia.

METHODS

Six patient cases were reviewed to identify similarities in patient factors. An in vitro study was conducted using healthy volunteer blood spiked with Niraparib concentrations ranging from 0 ng/mL to 5000 ng/mL. Manual platelet counts were evaluated at different time intervals for each concentration and compared to untreated controls. Data was then analyzed based on percent change in platelet count versus untreated control for each concentration/time point.

RESULTS

In three patients with body weight > 80 kg and platelet count >200 × 109/L, decreased creatinine clearance (CrCl) <60 mL/min was identified as potential signal. An additional three patients with weights below 77 kg and/or baseline platelet counts <150 × 109/L were re-evaluated, and it was observed that all had decreased CrCl of <60 mL/min. Albumin <3.5 g/dL was also observed in some patients with thrombocytopenia. The in vitro study, observed a direct concentration-dependent relationship between niraparib and thrombocytopenia.

CONCLUSIONS

The data suggests that renal insufficiency and hypoalbuminemia may be associated with the development of niraparib-induced thrombocytopenia. Moreover, the preliminary in vitro studies also demonstrated a concentration-dependent relationship between niraparib and direct toxicity to platelets.

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