Bladder cancer is the ninth most common cause of cancerrelated deaths worldwide. Although cisplatin is used routinely in treating bladder cancer, refractory disease remains lethal for many patients. The recent addition of immunotherapy has improved patient outcomes; however, a large cohort of patients does not respond to these treatments. Therefore, identification of innovative molecular targets for bladder cancer is crucial. Apurinic/apyrimidinic endonuclease 1/redox factor-1 (APE1/Ref-1) is a multifunctional protein involved in both DNA repair and activation of transcription factors through reduction-oxidation (redox) regulation. High APE1/ Ref-1 expression is associated with shorter patient survival time in many cancer types. In this study, we found high APE1/ Ref-1 expression in human bladder cancer tissue relative to benign urothelium. Inhibition of APE1/Ref-1 redox signaling using APE1/Ref-1-specific inhibitors attenuates bladder cancer cell proliferation in monolayer, in three-dimensional cultures, and in vivo. This inhibition corresponds with an increase in apoptosis and decreased transcriptional activity of NF-kB and STAT3, transcription factors known to be regulated by APE1/Ref-1, resulting in decreased expression of downstream effectors survivin and Cyclin D1 in vitro and in vivo. We also demonstrate that in vitro treatment of bladder cancer cells with APE1/Ref-1 redox inhibitors in combination with standard-of-care chemotherapy cisplatin is more effective than cisplatin alone at inhibiting cell proliferation. Collectively, our data demonstrate that APE1/Ref-1 is a viable drug target for the treatment of bladder cancer, provide a mechanism of APE1/Ref-1 action in bladder cancer cells, and support the use of novel redox-selective APE1/Ref-1 inhibitors in clinical studies.Significance: This work identifies a critical mechanism for APE1/Ref-1 in bladder cancer growth and provides compelling preclinical data using selective redox activity inhibitors of APE1/Ref-1 in vitro and in vivo.

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The prostate responds to deleterious inflammation with induction of cell survival mechanisms, most notably survivin and autophagy, demonstrating a coordinated induction of survival factors that protects and expands a specialized set of prostatic epithelial cells as part of the repair and recovery process during inflammation.

<b><i>Background:</i></b> Intermediate-stage hepatocellular carcinoma (HCC), as defined by Barcelona Clinic Liver Cancer (BCLC) stage B, is heterogeneous in terms of liver function and tumor burden. REACH and REACH-2 investigated ramucirumab in patients with HCC after prior sorafenib, with REACH-2 enrolling only patients with baseline α-fetoprotein (AFP) ≥400 ng/mL. An exploratory analysis of outcomes by BCLC stage was performed. <b><i>Methods:</i></b> A pooled meta-analysis of independent patient data (stratified by study) from REACH (AFP ≥ 400 ng/mL) and REACH-2 was performed. All patients had Child-Pugh A, Eastern Cooperative Oncology Group performance status 0–1, prior sorafenib treatment, and either HCC BCLC stage B (refractory/not amenable to locoregional therapy) or BCLC stage C. Patients were randomized to ramucirumab 8 mg/kg or placebo every 2 weeks. Median overall survival (OS) and progression-free survival were estimated by the Kaplan-Meier method. Treatment effects in BCLC stage B and C were evaluated by Cox proportional-hazards model; prognosis of BCLC staging for OS was evaluated by multivariate Cox proportional-hazards model. Tumor responses were evaluated according to Response Evaluation in Solid Tumors v1.1. Liver function was assessed with albumin-bilirubin score. <b><i>Results:</i></b> Baseline characteristics were generally balanced between treatment arms in each BCLC stage. BCLC staging trended as an independent prognostic factor for OS (B vs. C; hazard ratio [HR] 0.756 [95% CI 0.546–1.046]). Consistent treatment benefit was observed for ramucirumab versus placebo across BCLC stages. Median OS for ramucirumab versus placebo was 13.7 versus 8.2 months; HR (95%): 0.43 (0.23–0.83) and 7.7 versus 4.8 months; HR (95%): 0.72 (0.59–0.89) for BCLC stage B and C, respectively. Adverse events (AEs) were consistent with observations from both studies; hypertension was the most frequent grade ≥3 AE. Liver function was preserved throughout the study and similar between treatment arms in both BCLC stages. <b><i>Conclusions:</i></b> Ramucirumab provided a better survival benefit irrespective of BCLC stage and was well tolerated without compromising liver function during treatment.

549 Background: Intermediate-stage HCC, as defined as Barcelona Clinic Liver Cancer (BCLC) Stage B, is a heterogeneous disease in terms of liver function and tumor load. REACH (NCT01140347) and REACH-2 (NCT02435433) investigated ramucirumab (RAM) in patients (pts) with HCC after prior sorafenib (SOR), with REACH-2 enrolling only pts with baseline AFP ≥400 ng/mL. An exploratory analysis of outcomes by BCLC stage was performed. Methods: All pts had HCC (BCLC stage C or B disease refractory/not amenable to locoregional therapy), Child-Pugh A, ECOG PS 0-1, and prior SOR. Pts were randomized to RAM 8 mg/kg or Placebo (P) Q2W. A pooled meta-analysis of independent pt data (stratified by study) from REACH-2 and REACH (AFP ≥400 mg/mL) was performed. Prognosis of BCLC staging in overall survival (OS) was evaluated by multivariate Cox PH model (adjusted for baseline AFP and treatment (trt) arm); Trt effects in BCLC stage B and C by Cox PH model; median OS/PFS were estimated by Kaplan-Meier method. Objective response rate (ORR) per RECIST v1.1, disease control rate (DCR), and adverse events (AEs) were also reported by BCLC. Liver function was assessed at baseline and prior to each trt with the Albumin-Bilirubin (ALBI) linear predictor. Results: Baseline characteristics were generally balanced between trt arms in each BCLC stage. BCLC staging trended as an independent prognosis factor for OS [B v C; HR = 0.756 (0.546, 1.046)]. A consistent trt benefit for RAM v P was observed across staging (Table). Grade ≥3 AEs were consistent with observations from both individual studies; hypertension was the most frequent grade ≥3 AE. No difference in liver function, as measured by ALBI, was observed between trt arms in either BCLC stage. Conclusions: Acknowledging limitations of sample size, RAM provided a survival benefit irrespective of BCLC stage. RAM was well tolerated and did not alter liver function compared to P. Clinical trial information: NCT01140347, NCT02435433. [Table: see text]