A Phase I/II Clinical Study to Evaluate the Safety and Efficacy of Oral Teslanbaicin in Patients With Radiation Proctitis

Summary

Radiation Proctitis refers to rectal radiation injury caused by radiotherapy for pelvic malignancies. It is classified into Acute Radiation Proctitis (ARP) and Chronic Radiation Proctitis (CRP) based on onset time and disease progression, with a 3-month threshold distinguishing acute from chronic forms. Over 75% of patients undergoing pelvic radiotherapy develop ARP, while 5%-20% progress to CRP. CRP patients experience persistent symptoms and severe late complications such as gastrointestinal bleeding, perforation, obstruction, and fistulas, which pose significant clinical challenges and severely impact quality of life.

Probiotics have long been used in treating radiation proctitis. Radiotherapy disrupts the intestinal microbiome, leading to dysbiosis. Probiotics help restore microbial balance, normalize intestinal pH, and alleviate diarrhea. Commonly used probiotics include Lactobacillus, Bifidobacterium, Enterococcus, and Lactic Acid Bacteria. Clinical studies indicate probiotics significantly reduce radiotherapy-associated diarrhea risk. However, evidence for their efficacy against other symptoms (e.g., hematochezia, anal pain, tenesmus) or severe complications remains limited. A meta-analysis of 904 patients confirmed probiotics outperform placebos in reducing diarrhea incidence and decreasing loperamide use or watery stool frequency during pelvic radiotherapy.

Lactobacillus rhamnosus, a key probiotic in the human gut, colonizes the gastrointestinal tract and improves inflammatory bowel disease (IBD) symptoms by balancing microbiota, enhancing mucosal barriers, modulating immunity, and suppressing inflammation. Studies show it protects mice from radiation-induced intestinal epithelial damage by reducing apoptosis, increasing crypt survival, and shielding epithelial stem cells.

Chronic intestinal inflammation elevates reactive oxygen species (ROS) levels. Excessive ROS oxidizes cellular structures, triggers inflammatory cytokine release, promotes collagen deposition and fibrosis, and accelerates intestinal barrier damage. Reducing ROS may thus aid IBD prevention and treatment. Selenium, a trace element essential for glutathione peroxidase, scavenges ROS. Lactobacillus rhamnosus cultured with nano-selenium enhances selenium bioavailability. Selenium-enriched Lactobacillus rhamnosus may synergistically modulate gut microbiota and lower ROS to suppress inflammation.

Lactobacillus rhamnosus, approved as a food probiotic, has been safely consumed by 2-5 million people daily since the mid-1990s. Teslanbai bacteria, a novel probiotic derived from Lactobacillus rhamnosus (strain CICC 6137 from China Center of Industrial Culture Collection), incorporates nano-selenium via fermentation and freeze-drying. Preclinical studies demonstrate that oral Teslanbai alleviates DSS-induced acute enteritis symptoms, prevents weight loss, improves intestinal ulcers, reduces vascular permeability, and restores barrier function in mice. Treated mice exhibited intact intestinal structures and formed stools. Safety assessments revealed no adverse effects on blood components or major organs, suggesting Teslanbai's potential efficacy against radiation proctitis.

Conditions

• Safety

Interventions

DRUG

A Phase I/II Clinical Study to Evaluate the Safety and Efficacy of Oral Tesilanbaiju in Patients with Radiation Proctitis

Patients clinically diagnosed with radiation proctitis of CTCAE grade I-II will receive oral administration. Three dose groups of Teslanbai bacteria are tentatively planned, formulated as capsules with viable bacterial counts per capsule of ≥1107 CFU, 1108 CFU, and 1\*109 CFU, respectively. A "3+3" dose-escalation design will be adopted. Each dose group will enroll 3 subjects. If 1 subject experiences a grade ≥3 adverse reaction, 3 additional patients will be added. If 2 subjects exhibit adverse reactions, enrollment into higher dose groups will be discontinued. The final dosage for subsequent use of Teslanbai bacteria will be determined based on efficacy and safety data. Approximately 9 subjects are planned for enrollment. After determining the optimal dosage, investigators and sponsors will decide whether to proceed to Phase II based on the study results and external data.

DRUG

Teslanbai oral therapy

A Phase I/II Clinical Study to Evaluate the Safety and Efficacy of Oral Tesilanbaiju in Patients with Radiation Proctitis

Sponsors & Collaborators

• The First Affiliated Hospital of Xinxiang Medical College

  lead OTHER

Study Design

Allocation

NA

Purpose

TREATMENT

Masking

NONE

Model

SINGLE_GROUP

Eligibility

Min Age

18 Years

Sex

ALL

Healthy Volunteers

No

Timeline & Regulatory

Start

2024-10-15

Primary Completion

2026-12-31

Completion

2026-12-31

Countries

• China

Study Locations