A multicenter phase 1 study of PX-866 in combination with docetaxel in patients with advanced solid tumours.

Abstract:

BACKGROUND:This phase I, dose-finding study determined the safety, maximum tolerated dose (MTD)/recommended phase 2 dose (RP2D), pharmacokinetics, and antitumour activity of PX-866, a phosphatidylinositol 3-kinase inhibitor, combined with docetaxel in patients with incurable solid tumours. METHODS:PX-866 was administered at escalating doses (4-8 mg daily) with docetaxel 75 mg m⁻² intravenously every 21 days. Archived tumour tissue was assessed for potential predictive biomarkers. RESULTS:Forty-three patients were enrolled. Most adverse events (AEs) were grade 1 or 2. The most frequent study drug-related AE was diarrhoea (76.7%), with gastrointestinal disorders occurring in 79.1% (docetaxel-related) and 83.7% (PX-866-related). No dose-limiting toxicities were observed. The RP2D was 8 mg, the same as the single-agent MTD. Co-administration of PX-866 and docetaxel did not affect either drug's PKs. Best responses in 35 evaluable patients were: 2 partial responses (6%), 22 stable disease (63%), and 11 disease progression (31%). Eleven patients remained on study for >180 days, including 8 who maintained disease control on single-agent PX-866. Overall median progression-free survival (PFS) was 73.5 days (range: 1-569). A non-significant association between longer PFS for PIK3CA-MUT/KRAS-WT vs PIK3CA-WT/KRAS-WT was observed. CONCLUSION:Treatment with PX-866 and docetaxel was well tolerated, without evidence of overlapping/cumulative toxicity. Further investigation with this combination is justified.

journal_name

Br J Cancer

authors

Bowles DW,Ma WW,Senzer N,Brahmer JR,Adjei AA,Davies M,Lazar AJ,Vo A,Peterson S,Walker L,Hausman D,Rudin CM,Jimeno A

doi

10.1038/bjc.2013.474

subject

Has Abstract

pub_date

2013-09-03 00:00:00

pages

1085-92

issue

5

eissn

0007-0920

issn

1532-1827

pii

bjc2013474

journal_volume

109

pub_type

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