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Intraperitoneal delivery of NanoOlaparib for disseminated late-stage cancer treatment

Authors Baldwin P, Ohman AW, Tangutoori S, Dinulescu DM, Sridhar S

Received 8 September 2018

Accepted for publication 18 October 2018

Published 29 November 2018 Volume 2018:13 Pages 8063—8074


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 2

Editor who approved publication: Dr Thomas Webster

Paige Baldwin,1,* Anders W Ohman,2,* Shifalika Tangutoori,3 Daniela M Dinulescu,2,# Srinivas Sridhar1,3,4,#

1Department of Bioengineering, Northeastern University, Boston, MA, USA; 2Department of Pathology, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA, USA; 3Department of Physics, Northeastern University, Boston, MA, USA; 4Division of Radiation Oncology, Harvard Medical School, Boston, MA, USA

*These authors contributed equally to this work

#These senior co-authors contributed equally to this work

Background: PARP inhibitors, such as Olaparib, have advanced the treatment of ovarian cancer by providing patients with an effective and molecularly-targeted maintenance therapy. However, all orally-administered drugs, including Olaparib, must undergo first-pass metabolism. In contrast, a nanoparticle delivery system has the advantage of administering Olaparib directly into the peritoneal cavity for local treatment. Consequently, we sought to optimize the sustained-release formulation NanoOlaparib, previously deemed effective as an intravenous solid tumor treatment, for the local treatment of disseminated disease via intraperitoneal (i.p.) therapy.
Methods: The tumor cell line 404, which was derived from a Brca2-/-, Tp53-/-, Pten-/- genetically engineered mouse model, exhibited high sensitivity to Olaparib in vitro. It was chosen for use in developing an i.p. spread xenograft for testing nanotherapy efficacy in vivo. NanoOlaparib as a monotherapy or in combination with cisplatin was compared to oral Olaparib alone or in combination using two different dose schedules. A pilot biodistribution study was performed to determine drug accumulation in various organs following i.p. administration.
Results: Daily administration of NanoOlaparib reduced tumor growth and decreased the variability of the treatment response observed with daily oral Olaparib administration. However, systemic toxicity was observed in both the NanoOlaparib and vehicle (empty nanoparticle) treated groups. Scaling back the administration to twice weekly was well tolerated up to 100 mg/kg but reduced the effect on tumor growth. Biodistribution profiles indicated that NanoOlaparib began accumulating in tissues within an hour of administration and persisted for at least 72 hours after a single dose, exiting the peritoneal cavity faster than expected.
Conclusion: NanoOlaparib must be modified for use against disseminated disease. Future avenues to develop NanoOlaparib as an i.p. therapy include a modified surface-coating to retain it in the peritoneal cavity and prevent entry into systemic circulation, in addition to targeting moieties for localization in tumor cells.

Keywords: PARP inhibitor, Olaparib, intraperitoneal treatment, nanoparticle, DNA repair, ovarian cancer

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