A preclinical study combining the DNA repair inhibitor Dbait with radiotherapy for the treatment of melanoma.

Abstract:

:Melanomas are highly radioresistant tumors, mainly due to efficient DNA double-strand break (DSB) repair. Dbait (which stands for DNA strand break bait) molecules mimic DSBs and trap DNA repair proteins, thereby inhibiting repair of DNA damage induced by radiation therapy (RT). First, the cytotoxic efficacy of Dbait in combination with RT was evaluated in vitro in SK28 and 501mel human melanoma cell lines. Though the extent of RT-induced damage was not increased by Dbait, it persisted for longer revealing a repair defect. Dbait enhanced RT efficacy independently of RT doses. We further assayed the capacity of DT01 (clinical form of Dbait) to enhance efficacy of "palliative" RT (10 × 3 Gy) or "radical" RT (20 × 3 Gy), in an SK28 xenografted model. Inhibition of repair of RT-induced DSB by DT01 was revealed by the significant increase of micronuclei in tumors treated with combined treatment. Mice treated with DT01 and RT combination had significantly better tumor growth control and longer survival compared to RT alone with the "palliative" protocol [tumor growth delay (TGD) by 5.7-fold; median survival: 119 vs 67 days] or the "radical" protocol (TGD by 3.2-fold; median survival: 221 vs 109 days). Only animals that received the combined treatment showed complete responses. No additional toxicity was observed in any DT01-treated groups. This preclinical study provides encouraging results for a combination of a new DNA repair inhibitor, DT01, with RT, in the absence of toxicity. A first-in-human phase I study is currently under way in the palliative management of melanoma in-transit metastases (DRIIM trial).

journal_name

Neoplasia

authors

Biau J,Devun F,Jdey W,Kotula E,Quanz M,Chautard E,Sayarath M,Sun JS,Verrelle P,Dutreix M

doi

10.1016/j.neo.2014.08.008

subject

Has Abstract

pub_date

2014-10-23 00:00:00

pages

835-44

issue

10

eissn

1522-8002

issn

1476-5586

pii

S1476-5586(14)00114-6

journal_volume

16

pub_type

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