Vaccinia virus GLV-1h153 is effective in treating and preventing metastatic triple-negative breast cancer.

Abstract:

OBJECTIVE:This study aimed to investigate the therapeutic impact of a new oncolytic vaccinia virus in a triple-negative breast cancer (TNBC) murine model and its potential for treating distant metastatic disease. BACKGROUND:TNBCs are aggressive tumors associated with a high metastatic rate. Their lack of targets for hormonal/biological therapy presents significant clinical challenges and a dire need for novel therapies. METHODS:GLV-1h153, a replication-competent vaccinia virus, was tested against multiple cell lines. Cytotoxicity and viral replication were determined. Intratumoral (IT) or intravenous (IV) injection of GLV-1h153 (1 × 10(7) plaque-forming units) or phosphate buffered saline was tested in an orthotopic murine model, which reliably produces systemic metastasis. Tumors, lymph nodes, and metastatic organs (lung, liver, and brain) were harvested 5 and 8 weeks after treatment and prepared for histopathological review. Demonstration of metastasis was performed using immunofluorescence and hematoxylin and eosin (H&E) staining. RESULTS:GLV-1h153 infected, replicated in, and killed all TNBC cell lines in vitro. In vivo, mean tumor volume 2 weeks after treatment was 22 (IT), 29 (IV) versus 245 mm(3) (control; P < 0.002). Five weeks after treatment, all harvested lymph nodes and organs showed no evidence of metastatic cells. All harvested tumors showed complete response to treatment, with only necrosis and fibrosis on H&E staining 8 weeks after treatment. CONCLUSIONS:This is the first study to demonstrate that TNBCs are killed by a novel vaccinia virus both in vitro and in vivo. Our results suggest that GLV-1h153 is a promising therapeutic agent for preventing and treating metastatic TNBC and warrants further clinical testing in patients.

journal_name

Ann Surg

journal_title

Annals of surgery

authors

Gholami S,Chen CH,Lou E,De Brot M,Fujisawa S,Chen NG,Szalay AA,Fong Y

doi

10.1097/SLA.0b013e3182654572

subject

Has Abstract

pub_date

2012-09-01 00:00:00

pages

437-45

issue

3

eissn

0003-4932

issn

1528-1140

journal_volume

256

pub_type

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