• Overall Response Rate (ORR) according to RECIST1.1 criteria [ Time Frame: 13 weeks ]
  Overall response rate is defined as the number of patients experiencing PR or better (i.e. PR + CR) divided by the number evaluable for efficacy. Tumor regression or progression will be evaluated accordingly with RECIST 1.1 criteria.
• Disease Control Rate (DCR) [ Time Frame: 13 weeks ]
  Disease Control Rate is defined as as the number of patients experiencing SD or better (i.e. SD+PR+CR) divided by the number evaluable for efficacy. Tumor regression or progression will be evaluated accordingly with RECIST 1.1 criteria.
• Progression Free Survival (PFS) [ Time Frame: 15 years ]
  Progression-Free Survival is defined as the time from start of treatment to disease progression or death.
• Overall Survival (OS) [ Time Frame: 15 years ]
  Overall survival is defined as the time from the start of treatment to death due to any cause.
• Number of treatment related adverse events with grade 3 or greater severity by CTCAE 5.0 [ Time Frame: 30 days ]
  Treatment related adverse events with grade 3 or greater severity by CTCAE 5.0

This study is a first in human Phase 1 study that involves patients with a type of cancer called HER2 (Human Epidermal Growth Factor Receptor 2) positive cancer.

This study asks patients to volunteer to take part in a research study investigating the safety and efficacy of using special immune cells called HER2 chimeric antigen receptor specific cytotoxic T lymphocytes (HER2 specific CAR T cells), in combination with intra-tumor injection of CAdVEC, an oncolytic adenovirus that is designed to help the immune system including HER2 specific CAR T cell react to the tumor.

The study is looking at combining these two treatments together, because we think that the combination of treatments will work better than each treatment alone. We also hope to learn the best dose level of the treatments and whether or not it is safe to use them together.

In this study, CAdVEC will be injected into participants tumor at one tumor site which is most easiest to reach. Once it infects the cancer cells, activation of the immune response will occur so it can attack and kill cancer cells. (This approach may have limited effects on the other tumor sites that have not received the oncolytic virus injection, so, patients will also receive specific T cells following the intratumor CAdVEC injection.) These T cells are special infection-fighting blood cells that can kill cells infected with viruses and tumor cells.

Investigators want to see if these cells can survive in the blood and affect the tumor. Both CAdVEC and HER2-specific autologous CAR T are investigational products. They are not approved by the FDA.

Treatment with CAdVEC:

On the first day of your treatment, participants will receive an injection of CAdVEC into your tumor.

A blood sample will be obtained from the participant before the CAdVEC intratumor injection . Depending on the location of the tumor, different techniques can be used for the injection into your tumor. The most common route of injection is ultrasound-guided percutaneous (needle puncture in the skin) injection, but endoscopic (using a lighted, flexible instrument called an endoscope) ultrasound-guidance will be used for some patients as appropriate. Prior to percutaneous injection, participants may receive an anti-anxiety medicine to calm them down, to relieve muscle spasms, and provide sedation. If the participants tumor is injected during an endoscopic procedure, the procedure may be done under sedation.

Treatment with HER2- specific autologous T Cells:

Earlier the participant gave blood for us to make HER2 targeting cytotoxic T-lymphocytes (HER2- specific autologous T Cells). These cells are grown in the lab and frozen for participants. Invesitgators made the cells by combining dendritic cells (DCs) or monocytes with the T cells in the presence of produced mixtures of adenoviral proteins. Investigators then put a new gene in to those T cells to make them specifically attract to and kill HER2 positive tumors. As the T cells grow, they are cultured by adding adenoviral proteins for stimulation and expansion. Investigators call those T cells: HER2- targeting T cells (HER2- specific autologous T Cells).

This study looks at different doses of HER2- specific autologous T Cells. The decision about the dose participants receive is determined when enrolled on the study.

Seven dose levels will be evaluated. Cohorts of size 3 will be enrolled at each dose level until 9 evaluable patients have been studied at a single dose. Each patient will receive an intratumoral injection of CAdVEC alone or combined with an injection of HER2.CAR T cells.

CAdVEC intratumoral injection will be given as a single injection to a single appropriate tumor site by direct, endoscopic, or image-guided injection on Day 1. The injection site will be chosen based on a combination of criteria, including accessibility and safety of injection site; tumor size; and anticipated tumor viability (e.g. avoid necrotic or cystic injection sites). HER2.CAR T cells will be given intravenously on day 4 after CAdVEC injection, with a 3 day window (until day 7).

Before receiving the T cell infusion, participants may be given Benadryl (diphenhydramine) and Tylenol (acetaminophen). Tylenol and Benadryl are given to prevent a possible allergic reaction to the T cell administration.

Standard medical tests before treatment:

Before being treated, participants will receive a series of standard medical tests and procedures as well as research blood draws.

Standard Medical tests during and after treatment:

During treatment, participants will receive standard medical tests and procedures as well as research blood draws.

Study specific evaluations:

Investigators will follow participants closely after treatment for any side effects for at least 2 years after the last infusion.

To learn more about the way the T cells are working in the body, an extra blood sample will be taken before the CAdVEC injection, before the CAR T cell infusion, and at week 1, 2, 4 , 6, months 3, 6, 9 and 12 after CAR T cell infusion. Thereafter every 6 months up to 5 years and then yearly for 15 years. Investigators will use this blood to see how long the T cells last and to look at the immune response to the cancer. Investigators may also ask to get a tumor tissue biopsy at week 12 if necessary. Buccal swabs (cheek scraping) and urine will be collected before CAdVEC injection, Days 2, 4 (or the day of CAR T-cell infusion), weeks 1 and 2 after CAR T cell infusion.

• Bladder Cancer
• Head and Neck Squamous Cell Carcinoma
• Cancer of the Salivary Gland
• Lung Cancer
• Breast Cancer
• Gastric Cancer
• Esophageal Cancer
• Colorectal Cancer
• Pancreatic Adenocarcinoma
• Solid Tumor

Inclusion Criteria:

This study will look at solid tumors (as a basket trial for any solid cancer) with HER2 positivity based on IHC

1. Histologically confirmed HER2 positive solid tumors, including but not limited to: head and neck squamous cell carcinoma; cancer of the salivary glands; lung cancer; breast cancer; bladder cancer; gastric cancer; esophageal cancer; colorectal cancer; and pancreatic adenocarcinoma. HER2 positivity is defined as ≥2+ staining by IHC with either the FDA-approved CB11 antibody (Leica) or anti HER2/neu (4B5) (VENTANA), which refers to greater than weak-to-moderate staining intensity in >10% tumor cells.
2. The disease must be deemed by the appropriate multi-disciplinary tumor board unsuitable for curative surgery, radiotherapy, systemic therapy, including checkpoint inhibitors, or any combination of the above modalities.
3. Disease must have progressed after standard first line therapy, or without available effective treatment options. Patients are still eligible if they have failed more than one line of therapy.
4. The patient must have at least one tumor site appropriate for intratumoral injection.
5. The patient must have radiographically measurable disease as per RECIST 1.1.

6. The patient must have adequate organ function within 7 days prior to consent for treatment as indicated by following measures:

   • Hematologic: Absolute neutrophil count (ANC) ≥1.0 x 109/l; Hemoglobin ≥9 g/dl; Platelet count ≥ 100 x 109/l; PT or PTT ≤ 1.5 x ULN unless the subject is receiving anticoagulation.
   • Hepatic function: bilirubin < 2 x ULN, and AST and ALT < 3 x ULN
   • Renal Function: serum creatinine <2 x the ULN or creatinine clearance >60 mL/min.
   • Cardiac function: LVEF ≥ 55%.
7. Prior HER2 targeted therapy is allowed if delivered at least 4 weeks prior to the enrollment.
8. Prior immunotherapy is allowed if it was delivered at least 4 weeks prior to the enrollment.
9. Eastern Cooperative Oncology Group (ECOG) performance status 2 or less.
10. Females of childbearing potential must have a negative pregnancy test and agree to use contraception during on-study protocol therapy.
11. Male subjects with pregnant partner/female partner of childbearing potential agree to use barrier contraceptive during the study to minimize the risk of embryo-fetal exposure.
12. The patient is ≥ 18 years of age, and able to understand and give informed consent to study related procedures and treatments.

Exclusion Criteria:

1. Patients with any concurrent treatment that would compromise the study including but not limited to continuous high dose corticosteroids (more than 10mg/day prednisone or equivalent dose), lympho-depleting antibodies or cytotoxic agents, CNS metastasis requiring continuous high-dose steroids (more than 10mg/day prednisone or equivalent dose) or other active therapeutic intervention. This does not include stable, previously-treated brain metastases.
2. Patients at significant risk of airway compromise or other critical obstruction (e.g. bowel, ureter, etc.) in the event of possible post injection tumor inflammation based on the investigative team's judgement.
3. History or evidence of active autoimmune disease requiring continuous systemic corticosteroids, immunosuppressants or other disease modifying agents.

4. Evidence of significant immunosuppressive conditions, such as the following:

   • Post organ transplant.
   • Diagnosis of HIV or other immunodeficiency disorders.
5. Diagnosis of other malignancies within 5 years except for cutaneous basal cell or squamous cell carcinoma, well-differentiated thyroid cancer, or localized prostate cancer.
6. Patients with known active infectious disease, such as hepatitis B or C infection.
7. Patient has had acute myocardial infarction within 6 months prior to enrollment for treatment.
8. Patients with abnormal left ventricular function (LVEF <55%). i .Injectable tumor site is considered to incur a significant risk of major hemorrhage (e.g. located in the CNS (brain), pulmonary parenchyma, and proximal to critical neurovascular structures).

j. Pregnant or breastfeeding females. k. Uncontrolled intercurrent illness including but not limited to psychiatric illness and or social situations that in the opinion of the investigator would compromise compliance of study requirements or put the patient at unacceptable risk.