Examining Bioactivity of PVSRIPO in Invasive Breast Cancer

  • days left to enroll
  • participants needed
  • sponsor
    Istari Oncology, Inc.
Updated on 13 February 2022
residual tumor
epidermal growth factor receptor
progesterone receptor
triple-negative breast cancer


This is a pilot study to examine PVSRIPO bioactivity in tumor tissue after intratumoral administration of PVSRIPO in women with invasive breast cancer.


The study drug PVSRIPO is the live attenuated, oral (Sabin) serotype 1 poliovirus vaccine containing a heterologous internal ribosomal entry site (IRES) derived from the human rhinovirus type 2 (HRV2). The purpose of this pilot study is to examine PVSRIPO bioactivity in tumor tissue after intratumoral administration of PVSRIPO in women with invasive breast cancer. The hypothesis is that administration of PVSRIPO in the tumor causes inflammation, which stimulates innate and adaptive immune activation in invasive breast cancer. Enrollment target will include six women with invasive breast cancer. Women with stage II-IV invasive breast cancer with at least 1 cm of residual tumor after chemotherapy and scheduled for standard of care surgery will be eligible.

The objective of the study is to investigate PVSRIPO-mediated inflammation and immunity in women invasive breast cancer. The primary exploratory objective is to describe the change in the amount of tumor infiltrating immune cells in tumor tissue pre- and post-injection of PVSRIPO by H&E (Haemotoxylin and Eosin).

Other exploratory objectives are: 1.) to examine tumor tissue pre- and post-injection of PVSRIPO for inflammatory and immune signature using arrays, CD155 expression by immunohistochemistry (IHC), immune cell infiltrate by IHC and tumor infiltrating immune cells using flow cytometry (post-injection only); and 2) To examine blood for inflammatory and immune signature using arrays, immune cell composition (antigen presenting cells, B cells and T cells), T cell activation by flow cytometry and B cell activation by ELISA and peptide arrays. Blood will be collected on day -7 (before polio vaccine booster), day 0 (before PVSRIPO injection), day 2 (after PVSRIPO), day 14 (after PVSRIPO before surgery), and in follow-up at months 1 and 6 post-PVSRIPO.

Condition Invasive Breast Cancer
Treatment PVSRIPO
Clinical Study IdentifierNCT03564782
SponsorIstari Oncology, Inc.
Last Modified on13 February 2022


Yes No Not Sure

Inclusion Criteria

Age 18 years
Confirmation of invasive breast cancer including any of the following
Triple-negative breast cancer defined as receptor status being estrogen receptor expression 10%, progesterone receptor expression 10%, and HER2/Neu expression by IHC 0 or 1+, or 2+ with fluorescence in situ hybridization confirming no amplification of HER2 on a pretreatment tumor sample
Hormone positive breast cancer defined as receptor status being estrogen receptor expression > 10%, progesterone receptor expression > 10% prior to initiation of chemotherapy
HER2+ breast cancer defined as HER2/Neu expression by IHC 3+ or fluorescence in situ hybridization confirming amplification of HER2 on a pretreatment tumor sample prior to initiation of chemotherapy. HER2+ and hormone positive (ie triple positive) breast cancers are included in this study
Stage II-III invasive breast cancer with 1 cm of residual tumor based on MRI, mammogram, ultrasound, or breast clinical exam as SOC after completion of neoadjuvant chemotherapy, OR Stage IV BC with 1 cm locally recurrent disease (i.e. chest wall recurrence only)
Hemoglobin 9.0 g/dl, ANC 1,500 cells/l, platelets 100,000 cells/l
Women must have had last dose of chemotherapy at least 3 weeks prior to treatment with PVSRIPO
Women must have at least 2 weeks minimum (ideal 3-4 weeks) of a wash-out period after any steroid administration (IV, PO, or intraocular)
Serum creatinine 1.5 mg/dl, serum SGOT and bilirubin 1.5 times ULN (upper limit of normal)
Women must provide written informed consent prior to enrollment on study, prior to conduct of screening procedures and enrollment on study
Women of childbearing potential will have a negative serum pregnancy test at screening
Women of childbearing potential must be willing to avoid pregnancy for the course of the study through 120 days after PVSRIPO injection
Surgical resection of the tumor is planned and patient is willing to undergo surgical resection of the cancer

Exclusion Criteria

T1 N0 invasive breast cancer
Breast cancer with skin necrosis
Concurrent immune therapy, chemotherapy, or steroid therapy
Is currently participating in or has participated in a study of an investigational agent or using an investigational device within 4 weeks prior to polio vaccine booster
Has a known diagnosis of immunodeficiency
Has a known additional malignancy that is progressing or requires active treatment
Has known active central nervous system metastases and/or carcinomatous meningitis
Has an active autoimmune disease requiring systemic treatment within the past 3 months or a documented history of clinically severe autoimmune disease or a syndrome that requires systemic steroids or immunosuppressive agents
Has an active infection requiring systemic therapy
Has known psychiatric or substance abuse disorders that would interfere with the requirements of the trial
Is pregnant, breastfeeding, or expecting to conceive children within the projected duration of the trial, starting with the screening visit through 120 days after trial treatment
Has received prior therapy with an anti-PD-1, anti-PDL-1, anti-PDL-2, anti-CD137, or anti-CTLA-4 (or any other antibody or drug specifically targeting T cell co-stimulation or checkpoint pathways)
Has a known history of Human Immunodeficiency Virus (HIV)
Has known active Hepatitis B or Hepatitis C
Active liver disease with elevated transaminases > 2x ULN
Has received a live vaccine within 30 days prior to PVSRIPO treatment
Inactivated vaccines are acceptable and are not an exclusion criterion
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