Neoadjuvant anti-tumor vaccination prior to surgery enhances survival
© Fisher et al.; licensee BioMed Central Ltd. 2014
Received: 13 March 2014
Accepted: 26 August 2014
Published: 4 September 2014
This study was conducted to determine if anti-tumor vaccination administered prior to partial debulking surgery could improve survival using a murine solid tumour model.
Tumor incidence and survival rates were compared in mice bearing subcutaneous AB1-HA mesothelioma tumors that received either sham surgery, debulking surgery or vaccination prior to debulking surgery. Additionally, mice were depleted of CD4 and/or CD8 T lymphocytes during vaccination to assess their involvement in vaccine induced anti-tumor immunity. Flow cytometry was performed to characterise changes in the proportion and activation status of immune cells associated with anti-tumor immunity.
Neoadjuvant vaccination combined with debulking surgery resulted in decreased tumor burden, increased survival and generation of tumor-specific immunity compared to surgery alone. Depletion of CD8 T cells completely abrogated any vaccine induced anti-tumor immune response. Conversely, CD4 depletion enhanced CD8 T cell activation resulting in complete tumor regression in 70% of mice treated with combined surgery and vaccination therapy. Tumor free survival was associated with established immunological memory as defined by the induction of effector memory T cells and resistance to rechallenge with parental AB1 mesothelioma cells.
Neoadjuvant anti-cancer vaccination combined with partial debulking surgery induced CD8-dependent anti-tumor immunity that significantly delayed tumor outgrowth relative to surgery alone. Complete tumor eradication was observed when vaccination and surgery were performed in CD4 T cell depleted animals. This demonstrates that adjuvant immunotherapy can improve post-surgical survival following cancer debulking surgery and provides a scientific rational for clinical trials of such an approach.
KeywordsSurgery Cancer vaccine Lymphocytes Cancer immunotherapy Neoadjuvant
Surgery is a widely used therapy for many common solid tumors, including thoracic malignancies such as non-small cell lung cancer and in some patients with malignant mesothelioma ,. However, surgery alone is often not curative, as these cancers commonly relapse due to local recurrence of unresectable tumor or growth of distant metastases. While adjuvant chemotherapy or radiotherapy is often used post-surgery to eradicate sub-clinical distant metastases or residual local disease, these therapies result in limited survival benefits –; highlighting the need for the development of better adjuvant therapies.
In the last decade there has been considerable improvement in our understanding of the interaction between the host immune system and developing tumor. This has encouraged many researchers to revisit the use of adjuvant immunotherapies to target residual tumor mass. We have previously demonstrated delayed tumor development after combining debulking surgery with antitumor immunotherapy – and successfully used autologous tumor lysate as an effective anti-cancer vaccine ,. Vaccination against known tumor antigens also represents an appealing therapeutic option for the eradication of residual tumor following debulking surgery with different tumor vaccine protocols showing promise in a variety of preclinical models – and cancer vaccines continue to be clinically evaluated for a range of solid cancers (reviewed in –).
However, understanding when to vaccinate in relation to surgery may have a significant impact on the outcome of the treatment. In a murine model of melanoma, neoadjuvant vaccination (i.e. prior to surgery) was shown to provide superior protection against post-surgical tumour relapse compared to adjuvant vaccination . The authors assessed the presence and frequency of the key cell types associated with effective anti-tumor immunity (namely CD8 and CD4 T lymphocytes) and found that neoadjuvant vaccination enables surgery to coincide with the peak of the vaccine induced immune response, resulting in increased frequency tumor-specific CD8 T cells present in the tumor, lymph nodes and resection area. In this study we have chosen murine mesothelioma as the model because the tumors mimic their human counterparts molecularly, biologically and clinically and their immunological engagement with the host before and after surgery has been well defined –. Importantly, they appear to be sensitive to immunotherapy and, as some patients undergo debulking surgery, an ideal situation exists for possible translation to clinical studies.
Reagents and mice
All reagents were purchased from Sigma Aldrich (Castle Hill, NSW. Australia) unless stated otherwise. Female BALB/C (H-2Kd) aged between 6 and 8 weeks were obtained from the Animal Resources Centre (Murdoch, Western Australia). All mice were maintained under standard specific pathogen free (SPF) housing conditions and all animal experiments were carried out according to protocols approved by the University of Western Australia Animal Ethics Committee.
Mouse model: tumor inoculation and surgical resection of tumors
Mice were inoculated subcutaneously (s.c.) with 5×105 AB1-HA cells in a total volume of 100 μl PBS on the right hand flank unless otherwise stated. For all experiments mice were randomised into groups of 5 once tumors were established (approximately 50–70 mm2). Mice were culled when tumors reached the maximum allowable size of 100 mm2 as per UWA AEC approvals. All surgical resections were performed under general anaesthetic using inhalant isoflurane. As a control for the surgical process sham surgery was performed by making incisions into the tumor mass and re-suturing, without debulking. Debulking surgery was performed via elliptic incisions, centred over the s.c. tumors. Skin flaps were elevated to expose adherent tumors. Once tumors were dissected clear of adjacent fascia, 75% of the tumor mass was removed, with preservation of the tumor pedicles to ensure blood supply (as previously described ). Wounds were closed using 4–0 vicryl (polyglactin 910, Ethicon, Australia) continuous sutures. Mice received 0.1 mg/kg buprenorphine intraperitoneally (i.p.) in the recovery phase for postoperative analgesia as required.
Cell lines & vaccines
The murine mesothelioma cell line (AB1) was generated by injecting crocidolite asbestos i.p. into BALB/C mice as previously described  and subsequently transfected with the PR8 influenza virus haemagglutinin (HA) gene to produce AB1-HA .
Mouse adapted Influenza virus (PR/8/34/H1N1) was a kind gift from Dr Peter Henry (UWA School of Pharmacology, Perth Western Australia). PR8 virus was propagated in the allantoic fluid of 9-day old embryonated chicken eggs (Altona Hatchery, Forrestfield, Australia) at 37°C for 3 days and harvested as previously described , stored in single use aliquots at −80°C and diluted 1:100 to 1:400 in sterile PBS prior to intranasal vaccination of mice.
Generation of recombinant Modified Vaccinia Ankara expressing Influenza HA antigen. PR8 Influenza HA from the AB1-HA cell line was cloned via RT-PCR into pCR4 cloning vector using the pZeroBlunt-TOPO cloning kit. PCR primers were designed to introduce a Pme I restriction site and add a 6HIS-3xSTOP-Asc I sequence to the 5′ and 3′ end of the HA cds respectively. The Pme I/Asc I flanked HA-6HIS insert from pCR4-HA was then cloned into the modified Vaccinia Ankara (MVA) shuttle vector pZWIGR3  to produce pZWIGR3-HA. To generate recombinant MVA (rMVA) expressing HA, pZWIGR3-HA was transfected into wild type MVA (wtMVA) infected BHK-21 cells and rMVA-HA positive cells purified via sequential rounds of plaque purification based on expression of the fluorescent reporter Venus. The purity of rMVA-HA stocks was confirmed by the absence of wtMVA and presence of HA via PCR prior to expansion and ultra-purification of rMVA-HA stocks for experimental use. All rMVA-HA vaccinations were via i.p. injection in a total volume of 100 μl PBS containing 5×105 plaque forming units of virus.
Flow cytometry and antibodies
Flow cytometry was performed using a BD Canto II. All antibodies are anti-mouse unless otherwise stated. Flow cytometry: αCD3-PE-Cy7 (clone 145-2C11), αCD4-PerCP-Cy5.5 (clone GK1.5), αCD8-FITC (clone 53-6.7) and αCD278(ICOS)-APC (clone C398.4A) all BioLegend, USA; αCD8-APC-ef780 (clone 53–6.7), αFoxP3-FITC (clone FJK-16 s), αIFNγ-APC (clone XMG1.2), αCD44-PerCP-Cy5.5 (clone IM7), αCCR7-PE (clone 4B12) and αCD62L-APC (Clone MEL-14) all eBioscience, USA; αKi67-PE (clone B56) (BD Biosciences, USA) and HA-Dextramer-APC (Immudex USA, LLC. Virginia USA). For depletion experiments, purified αCD4 (GK1.5) and αCD8 (YTS.169) antibodies were obtained from Absolutions Pty Ltd (Western Australian Institute for Medical Research, Perth, Western Australia). Antibodies were administered by intravenous (i.v.) injection at a dose of 150 μg per mouse on day 1 and then 100 μg i.p. per mouse every third day as indicated. T cell subset depletion was confirmed by flow cytometry on peripheral blood samples.
Student’s t test was used to measure significance between two individual groups, Log rank analysis was performed on survival curves. All analysis was performed using Graph Pad Prism Software (Graph Pad Software Inc., CA, USA) and a p value <0.05 considered significant.
Neoadjuvant vaccination delays tumor growth following debulking surgery
We have previously demonstrated that partial, but not complete debulking surgery promotes protective anti-tumour immunity when combined with adjuvant immunotherapy . This is despite complete resection preventing any relapse of residual tumor growth . We have continued to refine our model of tumor debulking by investigating the effect of removing different amounts of tumor on the rate of residual tumor outgrowth and overall survival (Khong et al., manuscript in preparation) When 75% of the tumor was debulked we observed that the outgrowth of the residual tumor was relatively slow, while in contrast, removing 50% or less of the tumor had no effect on tumor outgrowth. We therefore chose a 75% debulk model for this study as it better represents the many clinical scenarios where debulking surgery is the realistic goral rather than complete resection.
CDT cell depletion during vaccination results in significant survival benefit following debulking surgery
CD4 T cell depletion enhances CD8 T cell activation and establishes immunological protection
Although surgery remains the most effective treatment option for many solid malignancies, regrowth of residual/non-resectable tumor or growth of distal metastases means that surgery is not always curative, highlighting the need to develop improved, combinatorial treatment strategies. Over the past decade our knowledge of how the immune system recognises and interacts with developing tumor has greatly expanded (reviewed in ,,), driving a renewed interest in utilising adjuvant immunotherapies in the treatment of solid tumors. One key question is whether new immunotherapies can add value to tumor debulking surgery.
In this study we assessed the impact of neoadjuvant vaccination in combination with partial debulking surgery. We chose a murine mesothelioma tumour model because it mimics its human counterpart and because it represents an ideal tumor for clinical translation. We found that vaccination induced a significant increase in CD8+ cytotoxic T lymphocytes (CTL), a key type of effector cell in anti-tumor immune responses . While surgery or vaccination alone delayed tumor growth relative to controls, a significant survival benefit was only observed when surgery and vaccination were combined. However, unlike Grinshtein et al., who showed that neoadjuvant vaccination protected against tumor regrowth after complete surgical resection , we observed that combined treatment could not prevent tumor outgrowth in our model. Instead, complete tumor eradication was only observed when combined vaccination and surgery was performed in the absence of CD4 T cells. While differences between models and vaccination protocols make it hard to directly compare our results, it is known that mesotheliomas secrete immunosuppressive cytokines such as TGF-β that may limit vaccine induced anti-tumour immunity in the tumor environment ,.
The requirement for CD4 T cell depletion suggests a role for regulatory T cells in limiting vaccine induced anti-tumour immunity. Treg are a subset of CD4+ T cells and are recognised as important negative regulators of immune responses . Treg have been shown to promote tumor growth by limiting the efficacy of tumor-specific CD8 T cell responses and their presence within the tumour infiltrate has been correlated with poor survival prognosis for a number of different malignancies (reviewed in ). Therefore, consistent with our findings, vaccination protocols that involve Treg depletion or inhibition of their immunosuppressive function warrant further investigation.
It is important to consider how CD4 depletion might be achieved in a clinical setting. To date cyclophosphamide has been extensively studied for its ability to enhance anti-tumour immunity, including anti-tumour vaccination, by reducing Treg when used at low doses –. Conversely, high dose cyclophosphamide is lymphodepletive , and while the use of high dose cyclophosphamide in combination with total body irradiation is critical to increase the effectiveness of adoptive cell therapy (ACT) treatment of melanoma patients ,, it is not without associated toxicity and the requirement of CD4 depletion during ACT has been questioned .
Recent studies have also shown that targeting the surface receptors cytotoxic T-lymphocyte antigen 4 (CTLA-4) and programmed death-1 (PD-1) on both effector and regulatory T cells, a process known as checkpoint blockade, can dramatically improve anti-tumor immunity –, especially in advanced stage melanoma –. These new advances in immunotherapy suggest a role for adjuvant immunotherapy to be included in anti-cancer vaccination protocols, particularly when combined with conventional treatments such as debulking surgery.
Taken together, this study demonstrates that neoadjuvant anti-tumor vaccination combined with partial debulking surgery is capable of inducing effective CD8 T cell dependent anti-tumor immunity. Furthermore, depletion of CD4 T cells during vaccination produced complete tumor eradication and established immunological memory that could protect against subsequent tumor growth.
These results suggest that prior to performing debulking surgery, administration of an immunotherapy consisting of transient CD4 T cell, or more specifically Treg depletion combined with anti-tumor vaccination is an effective therapeutic strategy to enhance survival. These results provide a logical basis for development of adjuvant immunotherapies for patients undergoing cancer surgery in whom complete tumor resection is not likely to be achieved, or who may achieve complete resection, but at high risk or relapse.
SF and AC equally contributed to this work and were involved in all aspects from design, data collection, analysis and interpretation and manuscript preparation. DDL, AK, TC and BW contributed to data collection, analysis and interpretation. AK, WJL, BR, and RL contributed to analysis and interpretation and manuscript preparation. All authors read and approved the final manuscript.
Murine mesothelioma cell line
Adoptive cell transfer
Cytotoxic T lymphocyte
Cytotoxic T lymphocyte antigen 4
Forkhead box transcription factor 3
Inducible T-cell COStimulator
Modified Vaccinia Ankara
Phosphate buffered saline
Prime Boost vaccination
Programmed cell death protein 1
Influenza A PR/8/34 H1N1 Mt Saini strain
- TEM :
T effector memory
Tumour growth factor beta
Regulatory T cell
The authors acknowledge Professor Don Diamond (Translational Vaccine Research group, Beckman Research Institute City of Hope National Comprehensive Cancer Centre, Duarte CA, 91010, USA) for providing the pZWIGR3 rMVA shuttle vector. The authors would also like to acknowledge the facilities, and the scientific and technical assistance of staff at the UWA Animal Care Services and the National Imaging Facility at the Centre for Microscopy, Characterisation & Analysis, The University of Western Australia, a facility funded by the University, State and Commonwealth Governments.
This work was funded by grants from the National Health and Medical Research Council of Australia, Insurance Commission of Western Australia and the Dust Diseases Board of New South Wales. The funding bodies had no role in the study design, data collection and analysis, decision to publish, or preparation of the manuscript.
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