Clinical trials
Rectal Cancer Stage I clinical trials
Below are recruiting rectal cancer stage i clinical trials, each written for real people, not researchers. We’re tracking 219 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT06911684RecruitingPhase 2
Combination therapy before surgery for rectal cancer
This trial tests a combination of radiation, two immunotherapy drugs (iparomlimab and tuvonralimab), a targeted therapy (regorafenib), and chemotherapy (CAPOX) given before surgery for locally advanced rectal cancer. The goal is to see if this approach can shrink the tumor and improve outcomes for people whose tumors have normal mismatch repair proteins (pMMR/MSS).
Guangzhou, GuangdongAges 18–75 - NCT06923345RecruitingPhase 2
Modified long-course radiation and chemo with immunotherapy for rectal cancer
This trial tests a treatment plan involving radiation, chemotherapy, and an immunotherapy drug (a PD-1 inhibitor) for people with a specific type of high-risk rectal cancer. The goal is to see if this combination helps shrink the tumor before surgery.
Guangzhou, GuangdongAges 18–75 - NCT07154173Recruiting
Gut bacteria study in metastatic colorectal cancer
This study looks at gut bacteria in people with colorectal cancer that has spread (metastatic). It aims to find patterns in the bacteria that may help doctors choose better treatments.
Guangzhou, GuangdongAges 18–75 - NCT07419490Recruiting
Moving ovaries and uterus to preserve fertility during pelvic radiation
This trial moves the ovaries and uterus higher in the belly before pelvic radiation to protect them, so patients may still be able to have children later. It is for women aged 18-40 with pelvic cancers that require radiation.
Tampa, FloridaAges 1.5 years–3.3 years - NCT07474103Recruiting
Chemo, radiation, and immunotherapy for high-risk rectal cancer
This trial tests a treatment plan that combines chemotherapy, radiation, and an immunotherapy drug before surgery for people with high-risk locally advanced rectal cancer. The goal is to see if this approach can improve outcomes.
WuhanAges 18–75 - NCT07646639RecruitingPhase 2
Radiation, chemotherapy, and immunotherapy for advanced rectal cancer
This study tests a combination of radiation therapy, chemotherapy drugs (capecitabine and oxaliplatin), and two types of immunotherapy (a PD-1 blocker and IL-2) for locally advanced rectal cancer. The goal is to see if this combination helps shrink tumors and improve outcomes before surgery.
Nanjing, JiangsuAges 18–70 - NCT07651553Recruiting
Transanal vs. Robotic Surgery for Rectal Cancer
This trial compares two surgical approaches to remove rectal cancer while preserving bowel function. Researchers want to see which method—performed through the anus or with robotic assistance—leads to better outcomes and quality of life.
Guangzhou, GuangdongAges 18–75 - NCT06931808Enrolling by invitationPhase 4
Fecal transplant with chemo, radiation, and immunotherapy for advanced colon cancer
This study tests a combination of fecal microbiota transplant, chemotherapy, radiation, and immunotherapy (sintilimab) for people with locally advanced rectal cancer. The goal is to see if this approach improves treatment outcomes.
Ningbo, ZhejiangAges 18–75 - NCT05174169RecruitingPhase 2/Phase 3
Adjuvant colon chemotherapy guided by tumor DNA results
This trial tests whether treatment for colon cancer after surgery can be guided by a blood test that looks for leftover cancer signals (ctDNA). It may help some people choose stronger or different chemo based on whether ctDNA is found after surgery.
Birmingham, AlabamaAges 18 years+ - NCT05236972RecruitingPhase 3
PD-1 antibody after colon cancer surgery for dMMR stage III
This phase 3 trial studies a PD-1 antibody medicine given after surgery to help prevent stage III colon cancer from coming back. It is specifically for people whose tumor is mismatch repair–defective (dMMR) or MSI-H, which may make the cancer more responsive to immune-based treatment.
GuangzhouAges 18–75 - NCT05482516RecruitingPhase 3
Testing blood test–guided treatment for GI cancers in remission
This Phase 3 study tests whether giving treatment based on a positive blood test for “minimal cancer signals” (ctDNA) can help people with certain GI cancers stay cancer-free longer. It focuses on people who have finished curative-intent therapy and currently have no visible disease on scans, but their blood test is still positive.
Washington D.C., District of ColumbiaAges 18 years+ - NCT05789433Recruiting
Aerobic exercise study after colon or rectal cancer surgery
This trial studies whether a supervised aerobic exercise program helps muscles “remodel” (change/strengthen) after colon or rectal cancer treatment. It may help people improve physical function during recovery, but you can only join if it’s safe for you and you can follow the study plan.
Orlando, FloridaAges 18 years+ - NCT06594887Recruiting
Rectal spacer use during proton therapy for prostate cancer
This trial tests how well a rectal spacer works when you get proton beam therapy for prostate cancer. The spacer is a gel placed between your prostate and rectum to protect healthy tissue.
Somerset, New JerseyAges 18 years+ - NCT05663775RecruitingPhase 2
Mesalamine to prevent bowel inflammation after melanoma immunotherapy
This study tests whether taking mesalamine can prevent colitis (bowel inflammation) in people with advanced melanoma who are treated with ipilimumab plus nivolumab. It may help reduce dangerous stomach or bowel side effects from this cancer treatment.
Edmonton, AlbertaAges 18 years+ - NCT07549399RecruitingPhase 3
Radiation, Chemotherapy, and Immunotherapy for Rectal Cancer
This trial tests a combination of radiation, chemotherapy, and immunotherapy drugs before surgery for people with locally advanced rectal cancer. The goal is to shrink the tumor and improve outcomes for patients with higher-risk disease.
Guangzhou, GuangdongAges 18–75 - NCT06843434RecruitingPhase 2
Study of two immunotherapy drugs for rectal cancer
This trial tests a combination of two immunotherapy drugs, botensilimab and balstilimab, for people with newly diagnosed rectal adenocarcinoma that has not spread. The goal is to see if this treatment can shrink the tumor before surgery.
Basking Ridge, New JerseyAges 18 years+ - NCT05597852Recruiting
Rectal gel spacer to help repeat prostate radiation
This trial studies whether placing a soft gel spacer near the rectum can make “salvage” prostate radiation safer and more tolerable when prostate cancer comes back locally. It may help reduce side effects by creating extra space between the rectum and the radiation area.
Toronto, OntarioAges 18 years+ - NCT05970133Recruiting
Robotic surgery vs laparoscopy for left colon cancer
This trial compares two ways to remove left-sided colon cancer and take the specimen out through the anus (without a large external incision). It may help find which approach is safer and more effective for curing Stage I–III disease.
TaipeiAges 18 years+ - NCT06997497RecruitingPhase 3
Study of Calderasib with other drugs for colorectal cancer
This trial tests a new drug called Calderasib combined with targeted therapy or chemotherapy for people with advanced colorectal cancer that has a specific genetic change (KRAS G12C mutation). It may be an option for those who have not had prior treatment for advanced disease.
Los Angeles, CaliforniaAges 18 years+ - NCT06279299Recruiting
Lymph node removal for rectal neuroendocrine tumors during laparoscopic surgery
This trial tests whether removing lymph nodes in the pelvis during laparoscopic surgery for rectal neuroendocrine tumors (a type of slow-growing or aggressive tumor) improves outcomes. It is for people with larger or recurrent tumors, or those at higher risk due to tumor grade or depth.
Beijing, Beijing MunicipalityAges 18–75 - NCT04035642Recruiting
Single high-dose MRI-guided radiation for intermediate prostate cancer
This trial tests whether a single, image-guided radiation treatment can treat intermediate-risk prostate cancer while better protecting the urethra (the urine tube). It may help patients get effective cancer control with potentially fewer urinary side effects, depending on the results.
LisbonAges 18 years+ - NCT07692152RecruitingPhase 3
Immunotherapy vs. chemo for MS anal cancer trial
This trial tests sintilimab (a type of immunotherapy) against mitomycin plus chemotherapy with radiation for anal cancer that hasn't spread. It aims to find a better treatment with fewer side effects.
Beijing, Beijing MunicipalityAges 18–75 - NCT06542757Recruiting
Focused radiation to main prostate tumor using MRI guidance
This trial tests a stronger, more focused radiation dose to the main tumor inside the prostate using MRI guidance. It aims to improve control of intermediate-risk prostate cancer while possibly reducing side effects.
New York, New YorkAges 18 years+ - NCT02292641Recruiting
MRI study for repeat pelvic colorectal cancer
This study uses a special MRI to help understand and stage colorectal cancer that has come back in the pelvis. The goal is to improve how doctors make treatment decisions after previous surgery.
OsloAges 16 years+
Hear when a new Rectal Cancer Stage I trial opens
We’ll email you when one opens — at most once a week, no account needed, unsubscribe anytime.
Common questions
- Are there clinical trials for rectal cancer stage i?
- Yes. Clin2 currently lists 219 recruiting rectal cancer stage i studies from the U.S. registry, each rewritten for real people, not researchers, so you can see what it’s testing and who it’s for.
- How do I know if I qualify for a rectal cancer stage i trial?
- Each study lists its eligibility criteria — rules about age, diagnosis, and prior treatments. On every Clin2 trial page we explain these in words written for real people and offer a short, optional pre-screen for a fit read. The study team makes the final decision.
- Does it cost anything to join a rectal cancer stage i trial?
- Using Clin2 is always free. Many trials cover the cost of the study treatment and related visits; some reimburse travel. The study team explains exactly what’s covered before you decide.
Related conditions
Clin2 helps you find and understand clinical trials and does not provide medical advice. Study data comes from ClinicalTrials.gov. Talk with your doctor about whether a specific trial is right for you.