Bladder preservation therapy in combination with atezolizumab and radiation therapy for invasive bladder cancer (BPT-ART) - A study protocol for an open-label, phase II, multicenter study

Efficacy and Safety of Bladder Preservation Therapy in Combination with Atezolizumab and Radiation Therapy (BPT-ART) for Invasive Bladder Cancer: Interim Analysis from a Multicenter, Open-label, Prospective Phase 2 Trial

PURPOSE

To evaluate the safety and pathologic complete response (pCR) rate of radiation therapy with atezolizumab as bladder-preserving therapy for invasive bladder cancer.

METHODS AND MATERIALS

A multicenter, phase 2 study was conducted with patients with clinically T2-3 or very-high-risk T1 bladder cancer who were poor candidates for or refused radical cystectomy. The interim analysis of pCR is reported as a key secondary endpoint ahead of the progression-free survival rate primary endpoint. Radiation therapy (41.4 Gy to the small pelvic field and 16.2 Gy to the whole bladder) was given in addition to 1200 mg intravenous atezolizumab every 3 weeks. After 24 treatment weeks, response was assessed after transurethral resection, and tumor programmed cell death ligand-1 (PD-L1) expression was assessed using tumor-infiltrating immune cell scores.

RESULTS

Forty-five patients enrolled from January 2019 to May 2021 were analyzed. The most common clinical T stage was T2 (73.3%), followed by T1 (15.6%) and T3 (11.1%). Most tumors were solitary (77.8%), small (<3 cm) (57.8%), and without concurrent carcinoma in situ (88.9%). Thirty-eight patients (84.4%) achieved pCR. High pCR rates were achieved in older patients (90.9%) and in patients with high PD-L1-expressing tumors (95.8% vs 71.4%). Adverse events (AEs) occurred in 93.3% of patients, with diarrhea being the most common (55.6%), followed by frequent urination (42.2%) and dysuria (20.0%). The frequency of grade 3 AEs was 13.3%, whereas no grade 4 AEs were observed.

CONCLUSIONS

Combination therapy with radiation therapy and atezolizumab provided high pCR rates and acceptable toxicity, indicating it could be a promising option for bladder preservation therapy.

The Current Progress and Future Options of Multiple Therapy and Potential Biomarkers for Muscle-Invasive Bladder Cancer

Bladder cancer is a common disease in men and the elderly. Current treatment paradigms include radical resection of the bladder and lymph nodes or transurethral resection, both supported by chemotherapy and/or radiation. New modalities, such as illumination-based therapies are also being translationally pursued. However, while survival rates have increased due to combined therapies (particularly chemotherapy, radiation, immune checkpoint inhibitors, and surgery), a lack of diagnostic markers leads clinical professionals to rely on frequently invasive and expensive means of monitoring, such as magnetic resonance imaging or bladder cystoscopy. To improve real-time diagnostic capabilities, biomarkers that reflect both the metabolic and metastatic potential of tumor cells are needed. Furthermore, indicators of therapy resistance would allow for rapid changes in treatment to optimize survival outcomes. Fortunately, the presence of nanoscale extracellular vesicles in the blood, urine, and other peripheral fluids allow for proteomic, genomic, and transcriptomic analyses while limiting the invasiveness of frequent sampling. This review provides an overview of the pathogenesis and progression of bladder cancer, standard treatments and outcomes, some novel treatment studies, and the current status of biomarker and therapy development featuring exosome-based analysis and engineering.

Efficacy of long-term extended nursing services combined with atezolizumab in patients with bladder cancer after endoscopic bladder resection

BACKGROUND

Nursing has been reported to effectively ameliorate physical movement, significantly decrease postoperative complications, and markedly improve the quality of life in patients with bladder cancer after endoscopic bladder resection. Atezolizumab (ATZ) has been approved as effective therapy for patients with bladder cancer. This study was aimed to assess the efficacy of long-term extended nursing services combined with ATZ in patients with bladder cancer after endoscopic bladder resection.

METHODS

A total of one 126 patients diagnosed with bladder cancer underwent endoscopic bladder resection were recruited in this study. Patients were randomly allocated into the long-term conventional nursing plus atezolizumab (LTCN-ATZ) (n = 60) and long-term extended nursing services plus atezolizumab (LTENS-ATZ) groups (n = 66). The renal function, physical movement, postoperative complications, the quality of life, survival, and recurrence were examined in patients in LTCN-ATZ and LTENS-ATZ groups during 36-month follow up.

RESULTS

Data in the current study demonstrated that the renal function, quality of life, satisfaction anxiety and depression for LTENS-ATZ group was significantly improved compared with that of LTCN-ATZ group. The occurrence rate was significantly lower, and the length of hospital stay was shorter for LTENS-ATZ than that of LTCN-ATZ group. Outcomes demonstrated that LTENS-ATZ increased survival and decreased the occurrence compared to those patients in LTENS-ATZ group.

CONCLUSION

In conclusion, outcomes in this study indicate that LTENS-ATZ improves renal function, and quality of life and prognosis in patients with bladder cancer after endoscopic bladder resection.