Citations

7053 Background: In ECHELON-1 (NCT01712490), 6-year follow-up (FU) analyses demonstrated significant improvements in overall survival (OS) and progression-free survival (PFS) with A+AVD (brentuximab vedotin plus doxorubicin, vinblastine, and dacarbazine) versus ABVD (doxorubicin, bleomycin, vinblastine, and dacarbazine), with a comparable safety profile. Here, we report data at 7-year median FU. Methods: Analyses of OS and PFS per investigator were conducted in the intent-to-treat (ITT) population (data cut-off March 11, 2023). Patients (pts) were randomized 1:1 to receive ≤6 cycles of A+AVD (n=664) or ABVD (n=670) on days 1 and 15, every 28 days. PET scan after cycle 2 (PET2) evaluation was mandatory. Long-term safety outcomes in the safety population included resolution or improvement of peripheral neuropathy (PN), second malignancies, and pregnancies. Results: At median FU of 89.3 months (95% CI 87.0–90.2), 7-year OS rates were 93.5% (95% CI 91.1–95.2) with A+AVD and 88.8% (95% CI 85.8–91.1) with ABVD; OS favored A+AVD over ABVD (HR 0.62; 95% CI 0.42–0.90; p=0.011). Subgroup analyses showed consistent OS benefit for A+AVD, including in the age <40 years and Stage IV disease subgroups (Table). 7-year PFS rates with A+AVD vs ABVD were 82.3% (95% CI 79.1–85.0) vs 74.5% (95% CI 70.8–77.7; HR 0.68 [95% CI 0.53–0.86]; p=0.001). PN improved/resolved in most pts at last FU (A+AVD: 86%; ABVD: 87%). Median (range) time to complete resolution of PN (A+AVD vs ABVD) was 16 (0–373) vs 10 (0–343) weeks; median (range) time to improvement was 42 (2–182) vs 19 (15–142) weeks. PN was ongoing in 28% (4% grade ≥3) of A+AVD and 20% (1% grade ≥3) of ABVD pts. Second malignancies were reported in 5% of A+AVD and 6% of ABVD pts. Pts and their partners reported 84/92 livebirths/pregnancies with A+AVD and 59/73 with ABVD; no stillbirths were recorded. Conclusions: At 7-year median FU, pts with stage III/IV cHL who received A+AVD showed a sustained PFS and OS benefit vs ABVD, with PFS rates indicating potential curability. The safety profile in pts treated with A+AVD showed no new safety signals at 7 years. Clinical trial information: NCT01712490 . [Table: see text]

The PRESERVE study (NCT04972097) aims to evaluate the safety and effectiveness of the NanoKnife System to ablate prostate tissue in patients with intermediate-risk prostate cancer (PCa). The NanoKnife uses irreversible electroporation (IRE) to deliver high-voltage electrical pulses to change the permeability of cell membranes, leading to cell death. A total of 121 subjects with organ-confined PCa ≤ T2c, prostate-specific antigens (PSAs) ≤ 15 ng/mL, and a Gleason score of 3 + 4 or 4 + 3 underwent focal ablation of the index lesion. The primary endpoints included negative in-field biopsy and adverse event incidence, type, and severity through 12 months. At the time of analysis, the trial had completed accrual with preliminary follow-up available. Demographics, disease characteristics, procedural details, PSA responses, and adverse events (AEs) are presented. The median (IQR) age at screening was 67.0 (61.0–72.0) years and Gleason distribution 3 + 4 (80.2%) and 4 + 3 (19.8%). At 6 months, all patients with available data (n = 74) experienced a median (IQR) percent reduction in PSA of 67.6% (52.3–82.2%). Only ten subjects (8.3%) experienced a Grade 3 adverse event; five were procedure-related. No Grade ≥ 4 AEs were reported. This study supports prior findings that IRE prostate ablation with the NanoKnife System can be performed safely. Final results are required to fully assess oncological, functional, and safety outcomes.

Abstract Intracellular trafficking involves an intricate machinery of motor complexes, including the dynein complex, to shuttle cargo for autophagolysosomal degradation. Deficiency in dynein axonemal chains, as well as cytoplasmic light and intermediate chains, have been linked with ciliary dyskinesia and skeletal dysplasia. The cytoplasmic dynein 1 heavy chain protein (DYNC1H1) serves as a core complex for retrograde trafficking in neuronal axons. Dominant pathogenic variants in DYNC1H1 have been previously implicated in peripheral neuromuscular disorders (NMD) and neurodevelopmental disorders (NDD). As heavy-chain dynein is ubiquitously expressed, the apparent selectivity of heavy chain dyneinopathy for motor neuronal phenotypes remains currently unaccounted for. Here, we aimed to evaluate the full DYNC1H1-related clinical, molecular and imaging spectrum, including multisystem features and novel phenotypes presenting throughout life. We identified 47 cases from 43 families with pathogenic heterozygous variants in DYNC1H1 (aged 0–59 years) and collected phenotypic data via a comprehensive standardized survey and clinical follow-up appointments. Most patients presented with divergent and previously unrecognized neurological and multisystem features, leading to significant delays in genetic testing and establishing the correct diagnosis. Neurological phenotypes include novel autonomic features, previously rarely described behavioral disorders, movement disorders and periventricular lesions. Sensory neuropathy was identified in nine patients (median age of onset 10.6 years), of which five were only diagnosed after the second decade of life, and three had a progressive age-dependent sensory neuropathy. Novel multisystem features included primary immunodeficiency, bilateral sensorineural hearing loss, organ anomalies and skeletal manifestations, resembling the phenotypic spectrum of other dyneinopathies. We also identified an age-dependent biphasic disease course with developmental regression in the first decade and, following a period of stability, neurodegenerative progression after the second decade of life. Of note, we observed several cases in whom neurodegeneration appeared to be prompted by intercurrent systemic infections with double-stranded DNA viruses (Herpesviridae) or single-stranded RNA viruses (Ross River fever, SARS-CoV-2). Moreover, the disease course appeared to be exacerbated by viral infections regardless of age and/or severity of neurodevelopmental disorder manifestations, indicating a role of dynein in anti-viral immunity and neuronal health. In summary, our findings expand the clinical, imaging and molecular spectrum of pathogenic DYNC1H1 variants beyond motor neuropathy disorders and suggest a life-long continuum and age-related progression due to deficient intracellular trafficking. This study will facilitate early diagnosis and improve counselling and health surveillance of affected patients.

TPS5118 Background: Novel androgen receptor pathway inhibitors (ARPIs) improve overall survival (OS) in patients (pts) with metastatic hormone-sensitive prostate cancer (mHSPC) in conjunction with testosterone suppression (TS) relative to TS alone. However, the duration of treatment required to derive clinical benefit is unclear, as is whether continuous treatment is requisite for optimal cancer outcomes. Favorable PSA declines have been associated with prolonged OS in clinical trials testing TS + ARPIs. We thus designed this single-arm Phase 2 trial to test the hypothesis that pts who achieve exceptional response to upfront TS + ARPI can suspend treatment, allowing for T recovery and improvement in quality of life while maintaining favorable clinical outcomes. Methods: Eligible pts had mHSPC by conventional imaging with PSA ≥ 5 ng/ml and T ≥ 150 ng/dl (or not known to have been hypogonadal) prior to starting treatment, have been receiving TS for 540-750 days and ARPI for ≥ 360 days, and have achieved PSA < 0.2 ng/ml (stable or falling for 3 consecutive measurements) with castrate T <50 ng/dl at the time of enrollment. Intermittent ADT for biochemical recurrence prior to mHSPC diagnosis, prior local therapy, prior radiation to metastatic sites, and up to 6 cycles of docetaxel in mHSPC are permitted. Pts who underwent surgical castration, received ARPI prior to mHSPC diagnosis, or are receiving experimental treatment for mHSPC or participating in a clinical trial that does not allow for TS or ARPI interruption are excluded. After enrollment, pts discontinue both TS and ARPI and are followed with PSA and T levels every 3 months, conventional CT/MRI and bone scan at least every 6 months, and FACT-P questionnaire for patient-reported outcomes every 6 months. Treatment re-initiation triggers are PSA increase to ≥ 5 ng/ml, radiographic change (progressive disease per modified RECIST 1.1 on CT/MRI or unconfirmed progressive disease per PCWG3 on bone scan), or symptoms attributable to prostate cancer. Subsequent management is per physician discretion. The primary endpoint is remaining treatment-free with eugonadal T (> 150 mg/dl) 18 months after the start of treatment interruption, with 75 pts to be enrolled to differentiate 18-month treatment free rates of 0.30 (null hypothesis) and 0.45 (alternative hypothesis). Secondary endpoints include time to eugonadal T, duration off treatment, and changes in patient-reported outcomes. Exploratory endpoints include radiographic progression-free survival, time to next treatment, OS, and correlation of tissue- and blood-based biomarkers with clinical endpoints. The study was activated in July 2022 and accrual is ongoing throughout the NCTN. Support: U10CA180821, U10CA180882, UG1CA189823, https://acknowledgments.alliancefound.org , Veracyte Inc. Clinical trial information: NCT05241860 .

PURPOSE Telisotuzumab vedotin (Teliso-V) is a c-Met–directed antibody-drug conjugate with a monomethyl auristatin E cytotoxic payload. The phase II LUMINOSITY trial (ClinicalTrials.gov identifier: NCT03539536 ) aimed to identify the optimal c-Met protein–overexpressing non–small cell lung cancer (NSCLC) population for treatment with Teliso-V (stage I) and expand the selected group for efficacy evaluation (stage II). Stage II enrolled patients with nonsquamous epidermal growth factor receptor ( EGFR )-wildtype NSCLC. METHODS Eligible patients had locally advanced/metastatic c-Met protein–overexpressing NSCLC and ≤2 previous lines of therapy (including ≤1 line of systemic chemotherapy). c-Met protein overexpression in nonsquamous EGFR -wildtype NSCLC was defined as ≥25% tumor cells with 3+ staining (high [≥50% 3+]; intermediate [≥25%–<50%]). Teliso-V was administered at 1.9 mg/kg once every 2 weeks. The primary end point was overall response rate (ORR) by independent central review. RESULTS In total, 172 patients with nonsquamous EGFR -wildtype NSCLC received Teliso-V in stages I and II. ORR was 28.6% (95% CI, 21.7 to 36.2; c-Met high, 34.6% [95% CI, 24.2 to 46.2]; c-Met intermediate, 22.9% [95% CI, 14.4 to 33.4]). The median duration of response was 8.3 months (95% CI, 5.6 to 11.3; c-Met high, 9.0 [95% CI, 4.2 to 13.0]; c-Met intermediate: 7.2 [95% CI, 5.3 to 11.5]). The median overall survival was 14.5 months (95% CI, 9.9 to 16.6; c-Met high, 14.6 [95% CI, 9.2 to 25.6]; c-Met intermediate, 14.2 [95% CI, 9.6 to 16.6]). The median progression-free survival was 5.7 months (95% CI, 4.6 to 6.9; c-Met high, 5.5 [95% CI, 4.1 to 8.3]; c-Met intermediate: 6.0 [95% CI, 4.5 to 8.1]). Most common any-grade treatment-related adverse events (AEs) were peripheral sensory neuropathy (30%), peripheral edema (16%), and fatigue (14%); the most common grade ≥3 AE was peripheral sensory neuropathy (7%). CONCLUSION Teliso-V was associated with durable responses in c-Met protein–overexpressing nonsquamous EGFR -wildtype NSCLC, especially in those with high c-Met. AEs were generally manageable.

LBA12004 Background: Hot flashes are among the most common adverse events impacting quality of life reported by patients receiving androgen deprivation therapy (ADT) for the treatment of prostate cancer. Oxybutynin is an effective therapy for reducing frequency and severity of hot flashes in women. Pilot information supports that this drug may also benefit men with hot flashes related to ADT. Methods: Patients with prostate cancer receiving a stable regimen of ADT with at least 28 hot flashes per week were randomized to receive either oral oxybutynin 2.5 mg twice a day, oxybutynin 5 mg twice a day, or matching placebo doses for 6 weeks. The primary endpoint was the change in patient-reported hot flash scores (determined by multiplying the number of hot flashes by the mean hot flash severity [grade 0: none, 1: mild, 2: moderate, 3: severe, and 4: very severe]) from baseline to 6 weeks, as measured by a daily hot flash diary. A total of 87 patients provided 76% power to reject the null hypothesis of no between-arm mean difference in hot flash score reduction from baseline to 6 weeks, when comparing each oxybutynin arm to the combined placebo arms. This was based on a two-sided contrast estimated from a generalized linear mixed model, α= 0.10, intraclass correlation of 0.50, population standardized mean difference of 0.50, and 10% missing data rate. Results: 88 patients were accrued between 10/28/21 and 12/02/23. Six patients cancelled before starting treatment and one was ineligible, leaving 81 analyzed patients with a median age of 68. Baseline characteristics were balanced between arms with patients reporting an average of 10.15 (SD = 5.55) hot flashes per day and an average daily hot flash score of 18.23 (SD = 13.48) at enrollment. On average, patients on the placebo arm, low dose oxybutynin arm, and high dose oxybutynin arm had reductions of 2.15, 4.77, and 6.89 hot flashes/day, respectively. Compared to placebo arm patients, high dose oxybutynin arm patients had a greater reduction in hot flashes/day (p < 0.001), as did low dose oxybutynin arm patients (p = 0.02). Daily hot flash scores for the same three protocol arms reduced by an average of 4.85, 9.94, and 13.95 points, respectively. Compared to placebo arm patients, high dose oxybutynin arm patients had a greater reduction in daily hot flash scores (p = 0.002), as did low dose oxybutynin arm patients (p = 0.07). No treatment-related grade 3+ adverse events occurred. The most commonly reported oxybutynin-related grade 2 adverse event was dry mouth. Conclusions: Oxybutynin is superior to a placebo for the management of hot flashes in men associated with androgen deprivation therapy and appears to be well tolerated. Support: UG1CA189823; https://acknowledgments.alliancefound.org . Clinical trial information: NCT04600336 .

AbstractBackgroundInvasive hemodynamics are fundamental in assessing patients with advanced heart failure (HF). Several novel hemodynamic parameters have been studied; however, the relative prognostic potential remains ill‐defined.HypothesisAdvanced hemodynamic parameters provide additional prognostication beyond the standard hemodynamic assessment.MethodsPatients from the PRognostic Evaluation During Invasive CaTheterization for Heart Failure (PREDICT‐HF) registry who underwent right heart catheterization (RHC) were included in the analysis. The primary endpoint was survival to orthotopic heart transplant (OHT) or durable left ventricular assist device (LVAD), or death within 6 months of RHC.ResultsOf 846 patients included, 176 (21%) met the primary endpoint. In a multivariate model that included traditional hemodynamic variables, pulmonary capillary wedge pressure (PCWP) (OR: 1.10, 1.04−1.15, p < .001), and cardiac index (CI) (OR: 0.86, 0.81−0.92, p < .001) were shown to be predictive of adverse outcomes. In a separate multivariate model that incorporated advanced hemodynamic parameters, cardiac power output (CPO) (OR: 0.76, 0.71−0.83, p < .001), aortic pulsatility index (API) (OR: 0.94, 0.91−0.96, p < .001), and pulmonary artery pulsatility index (OR: 1.02, 1.00−1.03, p .027) were all significantly associated with the primary outcome. Positively concordant API and CPO afforded the best freedom from the endpoint (94.7%), whilst negatively concordant API and CPO had the worst freedom from the endpoint (61.5%, p < .001). Those with discordant API and CPO had similar freedom from the endpoint.ConclusionThe advanced hemodynamic parameters API and CPO are independently associated with death or the need for OHT or LVAD within 6 months. Further prospective studies are needed to validate these parameters and elucidate their role in patients with advanced HF.

e13036 Background: In January 2023, the FDA approved elacestrant for ESR1-mutated, ER+/HER2- MBC based on a companion diagnostic cell free (cf)DNA test (Guardant Health). In this study, we analyze the trends of liquid biopsy utilization at Mayo Clinic (MC) over a 3 year period to understand the impact of this drug approval on testing patterns and identify emergent alterations in patients (pts) with MBC. Methods: We extracted clinically performed Guardant 360 and Guardant 360 CDx ordered at MC sites in Rochester (MN), Florida (FL), Arizona (AZ), and across 9 additional Mayo Clinic Health System (MCHS) sites. Pts with MBC were identified using the EMR and analyzing visit diagnosis codes and staging information. Shifts in testing patterns were analyzed over a 3 year period from January 1, 2021 - December 31, 2023. Data was collected on the number of tests, serial testing, frequency of pathogenic mutations, and emergent mutations in ESR1 and PIK3CA. Chi-square test was used to compare the categorical values. Results: Between 2021-2023, 2,741 pts with MBC were seen across all sites. A total of 408 cfDNA tests were performed in 370 unique patients with MBC. Most pts (90%) had 1 test performed. The proportion of pts with MBC tested was 85/1350 (6.3%) in 2021, 77/1495 (5.2%) in 2022, and 208/1558 (13.4%) in 2023. The increased proportion of pts tested in 2023 was statistically significant compared to prior years (p<0.0001), while no difference was observed between 2021 and 2022 (p 0.19). Testing patterns varied by site, with FL ordering the highest number of tests, followed by MN and AZ. Of the 34 providers practicing during the entire period seeing more than 10 MBC pts, the number of providers ordering Guardant testing increased from 15/34 (2021) and 14/34 (2022) to 20/34 (2023), though not statistically significant (p 0.15). Of the 41% with EMR-documented staging available, testing was highest in the ER+/HER2- (81.3%) subtype, followed by TNBC (13.6%) and then HER2+ (5.2%). The most commonly identified mutations identified in the first testing were PIK3CA (41.1%), TP53 (40.5%), ESR1 (30.5%), and ATM (13.2%). D538G (8.0%), Y537N (4.4%), and Y537S (3.5%) were frequent emergent mutations seen in ESR1. Conclusions: We observed an increase in cfDNA testing at the start of 2023 which aligns with the FDA approval of elacestrant. We observed variation by site and individual providers that warrants further exploration to improve cfDNA testing in MBC pts at Mayo Clinic.