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Rectal NeoplasmsPhase 2NCT07543848

A Prospective, Multicenter, Single-Arm Phase II Exploratory Study of Serplulimab Combined With Oncolytic Virus H101, Short-Course Radiotherapy, and XELOX Chemotherapy as Total Neoadjuvant Treatment for Locally Advanced (cT1-3N0M0) Rectal Cancer

A Phase 2 study testing Serplulimab, Oncolytic Virus H101 and XELOX Chemotherapy in people with Rectal Neoplasms and Rectal Adenocarcinoma, run by Chongqing University Cancer Hospital at 1 site in China.

Not yet recruiting

Opening soon. The study is approved but enrolment has not started yet. Sites may already take enquiries.

Sites and contacts
Official record
Search all trials

Trial summary

This study aims to evaluate the safety and effectiveness of a combination treatment including a PD-1 inhibitor (serplulimab), oncolytic virus H101, short-course radiotherapy, and XELOX chemotherapy as total neoadjuvant therapy in patients with locally advanced low rectal cancer (cT1-3N0M0). Read more about this study

Who is it for?
Ages 18 to 80 years
Conditions the study is for
Rectal Neoplasms, Rectal Adenocarcinoma
What is being tested?
Serplulimab, Oncolytic Virus H101 and XELOX Chemotherapy
Could I receive a placebo?
No, everyone receives an active treatment
How many people
20 participants
Where
1 siteChina
Study dates
1 May 2026to 31 Dec 2028
Phase
Phase 2
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 80 years
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Participants must meet all of the following criteria:
  • Age 18 to 80 years, male or female.
  • Histologically confirmed low rectal adenocarcinoma, with tumor located ≤5 cm from the anal verge.
  • Clinical stage T1-3N0M0 according to AJCC staging criteria.
  • Mismatch repair-proficient (pMMR) or microsatellite stable (MSS) tumor confirmed by immunohistochemistry or genetic testing.
  • No prior anti-tumor treatment.
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  • Eastern Cooperative Oncology Group (ECOG) performance status of 0-1, with an expected survival of at least 3 months.
  • Adequate organ function, including:
  • Absolute neutrophil count ≥1.5 × 10^9/L
  • Platelet count ≥100 × 10^9/L
  • Hemoglobin ≥9 g/dL
  • Serum albumin ≥3 g/dL
  • Total bilirubin ≤1.5 × upper limit of normal (ULN)
  • ALT and AST ≤2 × ULN
  • Serum creatinine ≤1.5 × ULN or creatinine clearance ≥60 mL/min
  • INR or PT ≤1.5 × ULN, and aPTT ≤1.5 × ULN
  • Thyroid function within normal range or adequately controlled.
  • Negative pregnancy test for women of childbearing potential.
  • Willingness to use effective contraception during the study and for 12 months after treatment.
  • Ability to understand and willingness to sign a written informed consent form.
  • Willingness and ability to comply with study procedures and follow-up.

Who cannot join

  • Participants will be excluded if they meet any of the following criteria:
  • Histology other than rectal adenocarcinoma (e.g., gastrointestinal stromal tumor, lymphoma).
  • Prior pelvic radiotherapy.
  • Prior treatment with PD-1, PD-L1, or CTLA-4 inhibitors.
  • Known allergy to study drugs or their components.
  • History of other malignancies, except adequately treated non-melanoma skin cancer, carcinoma in situ of the cervix, or papillary thyroid carcinoma.
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  • Active autoimmune disease or history of autoimmune disease requiring systemic treatment.
  • Immunodeficiency, including HIV infection, or history of organ transplantation.
  • History of interstitial lung disease or non-infectious pneumonitis.
  • Active tuberculosis infection or history of untreated tuberculosis.
  • Active hepatitis B or hepatitis C infection.
  • Severe cardiovascular, pulmonary, or renal disease.
  • Uncontrolled hypertension despite medication.
  • History of substance abuse (alcohol or drugs).
  • Active uncontrolled infection.
  • Use of systemic immunosuppressive therapy.
  • Pregnant or breastfeeding women.
  • Any condition that, in the investigator's opinion, may interfere with study participation or safety.

Trial locations and contacts

1 site in 1 country. Contact the study team or a site near you to ask about taking part.

China1 site
  • Chongqing University Cancer Hospital

    Chongqing, Chongqing Municipality, 400030

    Bo Yi, MD, +86-137-8617-9533, yibo2018pro@126.com

Other trials in China

About this study

Official title: A Prospective, Multicenter, Single-Arm Phase II Study of Serplulimab Combined With Oncolytic Virus H101, Short-Course Radiotherapy, and XELOX Chemotherapy as Total Neoadjuvant Therapy for Locally Advanced Rectal Cancer (cT1-3N0M0)

This study aims to evaluate the safety and effectiveness of a combination treatment including a PD-1 inhibitor (serplulimab), oncolytic virus H101, short-course radiotherapy, and XELOX chemotherapy as total neoadjuvant therapy in patients with locally advanced low rectal cancer (cT1-3N0M0).

In this prospective, multicenter, single-arm phase II study, eligible patients will receive a standardized treatment regimen consisting of intratumoral injection of oncolytic virus H101, short-course radiotherapy, chemotherapy, and immunotherapy over multiple cycles. Tumor response will be assessed using imaging, endoscopy, and clinical evaluation after completion of treatment.

Read more

The primary objective is to determine the 1-year clinical complete response rate. Secondary outcomes include tumor response rate, organ preservation rate, survival outcomes, and treatment safety.

The results of this study may help improve treatment strategies for rectal cancer, increase the rate of complete response, and provide more opportunities for organ preservation while maintaining safety.

Read the detailed description

Rectal cancer is a common malignancy with a significant impact on patient survival and quality of life. For patients with locally advanced rectal cancer, the current standard treatment typically includes neoadjuvant chemoradiotherapy followed by surgery. Although this approach can achieve tumor control, the rate of complete response remains limited, and surgery may result in permanent stoma or impaired bowel, urinary, and sexual function. Therefore, there is a need to develop more effective treatment strategies that can improve tumor response and increase the chance of organ preservation.

Most rectal cancers are mismatch repair-proficient or microsatellite stable (pMMR/MSS), which generally show limited response to immunotherapy alone. Recent studies suggest that combination strategies may enhance treatment efficacy by modifying the tumor microenvironment and improving immune response.

This study is designed to evaluate a novel combination treatment approach that includes a PD-1 inhibitor (serplulimab), an oncolytic virus (H101), short-course radiotherapy, and XELOX chemotherapy as total neoadjuvant therapy. The oncolytic virus H101 selectively infects and destroys tumor cells while stimulating anti-tumor immune responses. Radiotherapy may further enhance immune activation by promoting tumor antigen release, and chemotherapy can improve tumor sensitivity to treatment. The combination of these therapies is expected to have a synergistic effect. :contentReference[oaicite:0]{index=0}

This is a prospective, multicenter, single-arm phase II clinical trial. Approximately 20 patients with low rectal adenocarcinoma (cT1-3N0M0) will be enrolled. All participants will receive a standardized treatment regimen consisting of intratumoral injections of H101, short-course radiotherapy, and systemic treatment with serplulimab and XELOX chemotherapy over multiple cycles. :contentReference[oaicite:1]{index=1}

Tumor response will be evaluated after completion of the total neoadjuvant therapy using imaging, endoscopy, and clinical assessments. Patients who achieve clinical complete response may enter a non-surgical management strategy with close follow-up, while others may proceed to surgery based on clinical evaluation.

The primary endpoint of this study is the 1-year clinical complete response rate. Secondary endpoints include objective response rate, organ preservation rate, tumor downstaging, recurrence-free survival, disease-free survival, overall survival, and safety outcomes. :contentReference[oaicite:2]{index=2}

The findings of this study may provide evidence for a new treatment strategy for rectal cancer that improves tumor response and increases the possibility of organ preservation while maintaining acceptable safety.

Being tested
Serplulimab, Oncolytic Virus H101, XELOX Chemotherapy, Short-course Radiotherapy
Keywords
Rectal Cancer, Total Neoadjuvant Therapy, Combination Therapy, Serplulimab, PD-1 Inhibitor, Oncolytic Virus H101, XELOX Chemotherapy, Short-course Radiotherapy, Organ Preservation, Clinical Complete Response
Medical subject headings
Rectal Neoplasms

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • SerplulimabDrug

    Serplulimab is a humanized monoclonal antibody targeting programmed cell death protein-1 (PD-1). It will be administered intravenously at a fixed dose of 300 mg on Day 1 of each 3-week cycle for a total of 6 cycles. Serplulimab is given in combination with chemotherapy, radiotherapy, and oncolytic virus therapy as part of total neoadjuvant treatment. The aim is to enhance anti-tumor immune response and improve treatment efficacy.

  • Oncolytic Virus H101Biological

    H101 is a recombinant human adenovirus type 5 oncolytic virus that selectively replicates in and lyses tumor cells while stimulating anti-tumor immune responses. It will be administered by intratumoral injection on Day 1 of Cycle 1 and Day 1 of Cycle 4. The dose will be determined based on tumor size. H101 is used in combination with immunotherapy, chemotherapy, and radiotherapy to enhance tumor cell killing and improve immune activation.

  • XELOX ChemotherapyDrug

    XELOX chemotherapy consists of oxaliplatin and capecitabine. Oxaliplatin will be administered intravenously at a dose of 130 mg/m² on Day 1, and capecitabine will be given orally at a dose of 1000 mg/m² twice daily from Day 1 to Day 14 of each 3-week cycle. A total of 6 cycles will be administered. Chemotherapy is combined with immunotherapy, radiotherapy, and oncolytic virus therapy to improve tumor response.

  • Short-course RadiotherapyRadiation

    Short-course radiotherapy will be delivered to the rectal tumor using intensity-modulated radiation therapy (IMRT). The total dose is 25 Gy administered in 5 fractions over one week. Radiotherapy is given during the treatment course in combination with immunotherapy, chemotherapy, and oncolytic virus therapy. It aims to enhance local tumor control and stimulate anti-tumor immune response.

Study groups in NCT07543848
Study groupRoleWhat they receive
Serplulimab + H101 + Short-course Radiotherapy + XELOXExperimentalParticipants with low rectal adenocarcinoma (cT1-3N0M0) will receive total neoadjuvant therapy consisting of intratumoral oncolytic virus H101, short-course radiotherapy, serplulimab, and XELOX chemotherapy. H101 will be administered on Day 1 of Cycle 1 and Day 1 of Cycle 4. Short-course radiotherapy will be delivered during treatment. Serplulimab and XELOX chemotherapy will be administered every 3 weeks according to the study protocol. Tumor response will be assessed after completion of treatment.
Receives: Drug: Serplulimab; Biological: Oncolytic Virus H101; Drug: XELOX Chemotherapy; Radiation: Short-course Radiotherapy

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. 1-year Clinical Complete Response Rate

    Clinical complete response (cCR) is defined as no evidence of residual tumor based on digital rectal examination, endoscopy showing mucosal healing or scar, and imaging (MRI or CT) without tumor signal or metabolic activity, and no distant metastasis. The proportion of patients achieving cCR and maintaining it for at least 1 year will be evaluated.

    Measured: 1 year after completion of treatment

Secondary outcomes (5)
  1. Objective Response Rate

    The proportion of participants who achieve complete response (CR) or partial response (PR) based on imaging assessments according to RECIST criteria.

    Measured: Up to 6 months after treatment initiation

  2. Organ Preservation Rate

    The proportion of patients who achieve clinical complete response and avoid radical surgery, thereby preserving the rectum.

    Measured: 1 year after completion of treatment

  3. Disease-Free Survival

    Time from treatment initiation to the occurrence of disease recurrence, metastasis, or death from any cause.

    Measured: Up to 3 years

  4. Overall Survival

    Time from treatment initiation to death from any cause.

    Measured: Up to 3 years

  5. Incidence of Adverse Events

    The incidence and severity of treatment-related adverse events will be assessed according to the Common Terminology Criteria for Adverse Events (CTCAE) version 5.0.

    Measured: From treatment initiation up to 3 years

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted22 Apr 2026
  2. Study start1 May 2026 (estimated)
  3. Primary completion31 Dec 2028 (estimated)
  4. Study completion31 Dec 2028 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 2
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrolment
20 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT07543848
Sponsor's protocol ID
20260115101749430
Status last verified
Apr 2026
First submitted
15 Apr 2026
Last updated
22 Apr 2026
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
No: Individual participant data will not be shared due to patient privacy concerns and institutional data protection policies. De-identified data may be available upon reasonable request to the corresponding investigator, subject to approval.

Questions about this trial

What is this clinical trial studying?

A Phase 2 study testing Serplulimab, Oncolytic Virus H101 and XELOX Chemotherapy in people with Rectal Neoplasms and Rectal Adenocarcinoma, run by Chongqing University Cancer Hospital at 1 site in China.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 21 inclusion and 18 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: opening soon, as of the sponsor's last update on 22 Apr 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in China. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

Contact Bo Yi, MD (+86-137-8617-9533, yibo2018pro@126.com), or a site near the patient. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

1-year Clinical Complete Response Rate (time frame: 1 year after completion of treatment). It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 22 Apr 2026.

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