Objective response of the dual CYP17-Lyase (L) inhibitor / androgen receptor (AR) antagonist, VT-464, in patients with CRPC.

2016 ◽  
Vol 34 (2_suppl) ◽  
pp. 273-273
Author(s):  
Luke T. Nordquist ◽  
Neal D. Shore ◽  
Johann S. De Bono ◽  
Shilpa Gupta ◽  
William R. Berry ◽  
...  

273 Background: VT-464 is an oral, CYP17-L inhibitor and non-clinically an antagonist of the AR and its variants associated with clinical resistance to enzalutamide (ENZ) and abiraterone (AA). The safety, tolerability and initial pharmacodynamic effects (tumor responses, PSA and testosterone (T) decreases) of VT-464 given without steroid supplementation either bid with food or QD at night with dinner were evaluated in the Phase (Ph) 1/2 studies INO-VT-464-CL-001 (NCT02012920) and INO-VT-464-CL-004 (NCT02361086), respectively. Patients were either treatment-naïve (TN), or had failed AA or ENZ or AA/ENZ/chemotherapy (at least 2 out of the three). Preliminary objective response results from both studies are presented herein. Methods: Target lesions were assessed at baseline and during therapy using CT or MRI. Target lesion responses were categorized as a complete response (CR), partial response (PR), progressive disease (PD), or stable disease (SD) using RECIST 1.1. Patients with ≥ 1 target lesion and ≥ 1 post-baseline scan following VT-464 BID (INO-VT-464-CL-001) or QD (INO-VT-464-CL-004) were included in the analysis. Results are reported through a data cutoff of 01 Sep 2015. Results: Combined, 23 patients (8 TN, 4 AA, 7 ENZ, 4 AA/ENZ/chemotherapy) from both Ph 1/2 studies had ≥ 1 target lesion and ≥ 1 post-baseline scan. Of 15 patients included who were treated BID (Study 001), 1 had PD, 12 had SD and 2 had a PR. Of 8 patients who were treated QD (Study 004), 2 had PD, 5 had SD and 1 had a PR. No patient had a CR in either study. For the 3 patients with PRs one patient had a prior response to ENZ but failed taxane-based chemotherapy, another was de novo resistant to ENZ, while the third was TN. For the 3 PRs, one was confirmed with a repeat scan 8-weeks later and the others have repeat scans pending. Conclusions: Potent and selective CYP17-L inhibition, PSA reductions, and objective tumor responses in TN and ENZ-failure patients have been observed with oral VT-464 administered bid (de Bono et al, GU ASCO 2015) or QD (Shore et al, GU ASCO 2016). Preliminary results demonstrate that the QD regimes are as efficacious as BID regimens. All Ph 2 CRPC studies now utilize a 750 mg QD regimen. Clinical trial information: NCT02012920 and NCT02361086.

2020 ◽  
Vol 38 (15_suppl) ◽  
pp. 5061-5061
Author(s):  
Mehmet Asim Bilen ◽  
Brian I. Rini ◽  
Robert J. Motzer ◽  
James M. G. Larkin ◽  
John B. A. G. Haanen ◽  
...  

5061 Background: The phase 3 JAVELIN Renal 101 trial (NCT02684006) in treatment-naive patients with advanced renal cell carcinoma (aRCC) demonstrated significantly improved progression-free survival (PFS; hazard ratio [HR], 0.69; 95% CI, 0.56, 0.84; P < 0.001) and higher objective response rate (ORR; 51.4% vs 25.7%) with avelumab + axitinib vs sunitinib (Motzer RJ, et al. N Engl J Med. 2019;380:1103-15). NLR has emerged as a potential prognostic biomarker in aRCC; elevated NLR is associated with poorer prognosis. Here, we describe the association of NLR with the efficacy of avelumab + axitinib from JAVELIN Renal 101. Methods: We examined baseline NLR and its association with efficacy outcomes. PFS, best overall response (per blinded independent central review using RECIST 1.1), and overall survival (OS) data from the avelumab + axitinib arm from the first interim analysis of JAVELIN Renal 101 were analyzed (data cutoff, June 20, 2018). Multivariate Cox regression analyses of PFS and OS were also conducted. Results: In the avelumab + axitinib arm, patients with < median NLR (N = 217) had longer observed PFS (stratified HR, 0.85; 95% CI, 0.634, 1.153) and longer observed OS (stratified HR, 0.51; 95% CI, 0.300, 0.871) than patients with ≥ median NLR (N = 217). The ORR was 57.1% in patients with < median NLR vs 47.5% in patients with ≥ median NLR, with complete response in 5.5% vs 1.4%. Multivariate analysis showed that low NLR was associated with longer PFS and OS by treating baseline NLR as either a continuous variable or a binary variable (dichotomized by median). Conclusions: Low NLR was associated with better observed treatment outcomes in patients with aRCC who received avelumab + axitinib. Clinical trial information: NCT02684006 .


2016 ◽  
Vol 34 (2_suppl) ◽  
pp. 343-343 ◽  
Author(s):  
Neal D. Shore ◽  
Luke T. Nordquist ◽  
Shilpa Gupta ◽  
Mark T. Fleming ◽  
William R. Berry ◽  
...  

343 Background: VT-464 is an oral, CYP17-L inhibitor and non-clinically an antagonist of the AR and its variants associated with clinical resistance to enzalutamide (ENZ) and abiraterone (AA). The safety, tolerability and initial PD effects (tumor responses, PSA and testosterone (T)-decreases) of QD VT-464 were evaluated in this Phase (Ph) 1/2 study (INO-VT-464-CL-004; NCT02361086). Methods: Chemotherapy-naïve (n = 20) M0 (n = 1) and M1 (n = 19) patients with CRPC prior to (TN, treatment-naïve; n = 9), or after AA (n = 6),ENZ (n = 3) or both (n = 2) were enrolled in sequential dose-cohorts of 600 mg QD with dose titration (DT; 300 mg QD q2w), and 600 and 750 mg QD without DT in 28-day continuous dosing cycles. All doses except the first were given at night with dinner. Patient results through the 750 mg QD cohort are reported (data cut off 17 Aug 2015). Results: Patients received VT-464 without steroids at 600 mg QD+DT (n = 3), 600 mg QD (n = 8) or 750 mg QD (n = 9). Eight patients are on study in cycles 3-12. Most adverse events (AEs) were Grade (Gr) 1 or 2. Fourteen Gr 3 AEs were reported with 7 considered unrelated and 7 ≥ possibly related; 5 of the latter were in the 600 mg QD+DT cohort (bradycardia, hypotension, syncope, hypertension and hyponatremia) with 2 in non-DT cohorts (hypotension, bilateral lower leg weakness). No AEs ≥ Gr 4 were reported. One DLT occurred in the 600 mg QD+DT cohort (syncope). No mineralocorticoid excess syndrome, ACTH response changes, or increased LFTs were observed. Plasma T was below the LOQ (0.03nM) in 67% of patients, with progesterone and cortisol unchanged. Cmax was similar in all cohorts to 450 mg bid (de Bono et al, GU ASCO 2015) but AUC was decreased. All 4 TN patients had PSA declines at 600 mg QD including one 30% and one 50% response; there was one 50% response in the 600 mg QD+DT cohort. Both TN patients treated at 750 mg QD had > 50% response. Of 8 patients with ≥ 1 soft tissue target lesion and ≥ 1 post-baseline scan, 5 had stable disease and 1 had a partial response at Cycle 5. Conclusions: The VT-464 750 mg QD regimen demonstrated potent and selective CYP17 L inhibition and has been selected for all Ph 2 clinical studies based upon improved tolerability, PK and efficacy compared to bid+DT dosing (de Bono et al, GU ASCO 2015). Clinical trial information: NCT02361086.


2021 ◽  
Vol 9 (Suppl 3) ◽  
pp. A490-A490
Author(s):  
Hao Luo ◽  
Dan Jian ◽  
Yan Feng ◽  
Li Zhong ◽  
Qian Chen ◽  
...  

BackgroundThis trail is an open-label, single-arm, phase II study that aims to observe the efficacy and safety of toripalimab combined with anlotinib and platinum-etoposide (EP) chemotherapy as first-line treatment in ES-SCLC (Clinical trial information: NCT04731909). The preliminary results of the study have been presented in 2020 ASCO abstract e20570, which demonstrated 100% objective response rate (ORR) and tolerable safety. Here we report PFS analysis results of the study.MethodsThe study enrolled treatment-naïve ES-SCLC patients (18–75 years, ECOG PS ≤2) who have measurable target lesion evaluated by RECIST v1.1. All enrolled patients received toripalimab (240 mg, d1) combined with etoposide (100 mg/m2, d1–3) plus carboplatin (AUC=5, d1)/cisplatin (75 mg/m2, d1) and anlotinib (12 mg QD, d1–14) of a 21-day cycle. After 4–6 cycles of the treatment, patients who achieved complete response (CR), partial response (PR) or stable disease (SD) could continue to receive maintenance therapy with toripalimab and anlotinib until disease progression. The primary endpoint was overall survival (OS). ORR, disease control rate (DCR), progression-free survival (PFS) and safety were set as secondary endpoints.ResultsAs of July 16, 2021, the median follow-up was 13.7 months. 9 disease progression events occurred of the enrolled 16 treatment-naïve ES-SCLC patients (14 males, 2 females, median age 63). The investigator-assessed median PFS was 13.3 months (95%CI: 5.0–21.6). The PFS rate at 6 months was 81.3% and the PFS rate at 12 months was 31.3%. 15 patients were still alive and the study treatments for 7 patients were still ongoing. At the data cutoff, there was only 1 patient dead with 37.6 months OS and the median OS was not reached. No new unexpected adverse events were observed.ConclusionsCombined with preliminary data at 2020 ASCO, toripalimab combined with anlotinib and EP chemotherapy showed excellent ORR and PFS as well as tolerable safety in treatment-naïve ES-SCLC. The combination therapy is expected to provide clinically meaningful OS benefit and become a promising treatment option.Trial RegistrationThis study is registered with ClinicalTrials.gov (National Institutes of Health), number NCT04731909.Ethics ApprovalThe program was approved by the ethics committee of Army Medical Center (Daping Hospital ).


2021 ◽  
Vol 39 (15_suppl) ◽  
pp. e13557-e13557
Author(s):  
Manish Sharma ◽  
Anitha Singareddy ◽  
Surabhi Bajpai ◽  
Jayant Narang ◽  
Michael O'Connor ◽  
...  

e13557 Background: Lung cancer is the leading cause of cancer death in the world including more than 160,000 deaths in the US. The purpose of the study was to determine whether inter reader variability in Sum of Diameters (SOD) of tumor burden has any correlation with variability in end point assessment in lung cancer progression. RECIST 1.1 is based on the SOD of target lesions seen on imaging studies. Response criteria for evaluation of target lesions include - Complete response (CR), Partial response (PR), Progressive disease (PD) and Stable disease (SD). The key determinant of patient response is based on Target Lesion response which in turn is determined by SOD. Inter reader variability study plays an important role in the development of reliable diagnostic tools and understanding of imaging outcomes given the confounding factors like effusion, atelectasis and consolidation in lung cancer that affect Target Lesion selection. Methods: Retrospective analysis of 470 patients was carried out using RECIST 1.1. Double read with adjudication is the preferred read model for submission studies where images are read by two independent reviewers blinded to treatment allocation. As per RECIST 1.1, lesions were measured in the longest diameter for non-nodal and short axis for nodal lesions. This was followed by the calculation of SOD for total tumor burden. If these two primary reviewers disagree, then a third radiologist, the “adjudicator”, reviews the assessments performed by the first two radiologists and selects between the more accurate one. For further analysis, patients were divided into 2 groups, the one with no adjudication i.e. agreement between both readers and the second group with adjudication i.e. disagreement between both readers and ANOVA was used to perform analysis of Variance. Results: Of 470 patients, 332 patients with disagreement were adjudicated, while there was agreement on 138 patients assessments between both readers. SOD of baseline visits for all patients was assessed using ANOVA - single factor with following results: F ratio of 4.76 for Disagreement group was more than F crit (3.86) with P-value 0.03, while for Agreement group F value was less than F crit. Conclusions: There is a direct relationship of variability in SOD at baseline between two readers to the possibility of disagreement in their end point assessment. Additional rules around selection and measurement of Target Lesions should be proposed in protocol to reduce variability and improve endpoint assessment outcomes.[Table: see text]


Blood ◽  
2005 ◽  
Vol 106 (11) ◽  
pp. 4740-4740
Author(s):  
Athanasios G. Galanopoulos ◽  
Anastasia Tsakiridou ◽  
Eurydiki Michalis ◽  
Theodoros Marinakis ◽  
George Gortzolidis ◽  
...  

Abstract Background: The treatment of patients with chronic lymphocytic leukemia (CLL) with Rituximab in combination with fludarabine and cyclophosphamide was reported to be more efficacious, in terms of complete and molecular remission compared with historical data for fludarabine plus cyclophosphamide (S.O’Brien, Haematologica2002; 87:50–53). Aims: Evaluation of the clinical efficacy and toxicity of the FCR combination in patients of our Haematologic Centre. Methods: Seventeen patients, 8 males and 9 females with a median age of 69,5 years, with relapsed/refractory or de novo CLPD (9 CLL and 8 NHL patients) were enrolled in this study between February 2002 and August 2004. Fifty percent of CLL patients had Rai stage I/II and the rest 50% had Rai stage III/IV disease. Four NHL patients had an International Prognostic Index (IPI) 2, one patient IPI 3 and three patients IPI 4. All patients were treated with Rituximab 375 mg/m2 on day1 in combination with Fludarabine and Cyclophosphamide (25 mg/m2 and 250 mg/m2 respectively) for days 2 to 4, every 4 weeks, for 6 consecutive cycles. Nine patients had a history of a prior unsuccessful treatment. Results: Overall, 14 out of 17 evaluable patients (82%) were responsive to the treatment [12 patients (70%) complete response (CR) and 2 patients (12%) partial response (PR)]. The remaining 3 patients had progressive disease (NR). Hematological toxicity was acceptable (grade 2–3 neutropenia in 6/17 patients, grade 2–3 anemia and thrombocytopenia in 2/17 patients). There were no septic episodes except one case with neutropenic fever. There were no adverse events like nausea or vomiting except one patient with a serious anaphylactic reaction due to Rituximab administration. Three CLL patients died because of progressive disease. Summary/conclusions: this preliminary report suggests that the FCR regimen is an effective and safe treatment for CLPD patients, achieving higher CR rates than previous treatments. A longer follow up of a larger number of patients is required to confirm an improved survival in these patients.


2013 ◽  
Vol 31 (15_suppl) ◽  
pp. 4515-4515 ◽  
Author(s):  
Brian I. Rini ◽  
Laura S. Wood ◽  
Paul Elson ◽  
Hui Zhu ◽  
Namita Chittoria ◽  
...  

4515 Background: S as initial treatment in mRCC is limited by balancing acute and chronic toxicity with clinical benefit. Pre-clinical and retrospective clinical data support that extended treatment breaks are feasible without a reduction in efficacy. Methods: Pts with treatment-naïve clear cell mRCC were enrolled on a prospective phase II trial and initially treated with 4 cycles of S (50 mg 4/2). Pts with ≥ 10% reduction in tumor burden (TB) following 4 cycles had S held, with CT scans approximately every 10 weeks. S was re-initiated for 2 cycles in those pts with an increase in TB by ≥ 10% and again held with ≥ 10% TB reduction. This intermittent S dosing continued until RECIST-defined disease progression while on S. The primary objective was feasibility of intermittent S, defined as the proportion of eligible pts who underwent intermittent therapy. The alternative hypothesis was a feasibility of > 80% vs. a null hypothesis of < 50% (a=0.05; power 80%). Results: Thirty-six pts were enrolled; 70% male, median age 60, 95% PS 0/1 and 32% favorable/65% intermediate by Heng criteria. Twenty pts were eligible for intermittent therapy and all pts (100%) entered the intermittent phase. Pts were not eligible for intermittent S due to PD (n=13); toxicity (n=1) or w/d of consent (n=2) prior to end of cycle #4. Sixteen pts (80%) had ≥ 10% TB increase off S with a median (range) increase of 1.5 cm (1.1-2.5) compared to the TB immediately prior to stopping S, considering all off periods.Four pts did not have ≥ 10% TB increase off S (3 pts after the 1st off period; off for 12, 8 and 5 months to date and 1 pt after the 2nd off period; off for 8 months prior to restarting S). Most pts exhibited a stable saw tooth pattern of TB reduction on S and TB increase off S. No pt had RECIST-defined PD while on S, but 2 pts were taken off extended breaks due to gradual TB increase over time, and 1 pt developed new CNS mets during the 2nd off period.The objective response rate was 53%. Toxicity was typical for S and completely resolved during treatment breaks. Conclusions: S dosing with periodic extended time off drug is feasible and associated with reduction in toxicity during the off periods. Clinical efficacy does not appear to be compromised. Clinical trial information: NCT01158222.


2017 ◽  
Vol 35 (15_suppl) ◽  
pp. 9507-9507 ◽  
Author(s):  
Hussein Abdul-Hassan Tawbi ◽  
Peter A. J. Forsyth ◽  
Alain Patrick Algazi ◽  
Omid Hamid ◽  
F. Stephen Hodi ◽  
...  

9507 Background: Brain metastases (BMts) are a major cause of morbidity/death in MEL. We report the first efficacy data in MEL patients (pts) with BMts who received NIVO+IPI in study CheckMate 204. Methods: In this multicenter US trial (NCT02320058), MEL pts with ≥1 measurable BMt 0.5-3.0 cm and no neurologic symptoms or steroid Rx received NIVO 1 mg/kg + IPI 3 mg/kg Q3W x 4, then NIVO 3 mg/kg Q2W until progression or toxicity. Pts with severe adverse events (AEs) during NIVO+IPI could receive NIVO when toxicity resolved; stereotactic radiotherapy (SRT) was allowed for brain oligo-progression if an assessable BMt remained. The primary endpoint was intracranial (IC) clinical benefit rate (complete response [CR] + partial response [PR] + stable disease [SD] > 6 months). The planned 90-pt accrual is complete; we report efficacy and updated safety for 75 pts with disease assessment before the Nov 2016 database lock. Results: Median age was 59 yrs (range 22–79). Median number of induction doses was 3; 26 pts (35%) received 4 NIVO+IPI doses and 38 pts (51%) began NIVO maintenance. Response data are reported at a median follow-up of 6.3 months (Table). The IC objective response rate (ORR) was 56% (95% CI: 44–68); 19% of pts had a complete response. IC and extracranial responses were largely concordant. Rx-related grade 3/4 AEs occurred in 48% of pts, 8% neurologic, including headache and syncope. Only 3 pts (4%) stopped Rx for Rx-related neurologic AEs. One pt died of immune-related myocarditis. Conclusions: In CheckMate 204, prospectively designed to investigate NIVO+IPI in MEL pts with BMts, NIVO+IPI had high IC antitumor activity with objective responses in 56% of pts, CR in 19%, and no unexpected neurologic safety signals. The favorable safety and high anti-melanoma activity of NIVO+IPI may represent a new Rx paradigm for pts with asymptomatic MEL BMts and could change practice to avoid or delay whole brain RT or SRT. Clinical trial information: NCT02320058. [Table: see text]


2019 ◽  
Vol 37 (15_suppl) ◽  
pp. 10035-10035 ◽  
Author(s):  
Jason R. Fangusaro ◽  
Franco Locatelli ◽  
Maria Luisa Garré ◽  
Lynley V. Marshall ◽  
Maura Massimino ◽  
...  

10035 Background: Central nervous system (CNS) tumors are the most common cause of pediatric cancer mortality and novel therapies are needed for refractory disease. Pomalidomide (pom) is an oral immunomodulatory agent with CNS penetration, anti-angiogenic, anti-inflammatory and cytotoxic activity. Methods: This Phase 2 study evaluated both safety and efficacy of pom in pediatric patients with recurrent/progressive CNS tumors. Using a Simon’s two-stage design, patients were stratified to high-grade glioma [HGG], ependymoma, medulloblastoma or diffuse intrinsic pontine glioma [DIPG] cohorts. Patients received pom 2.6 mg/m2 for 21 days of a 28-day cycle. The primary endpoint was objective response rate (complete response [CR], partial response [PR]) or prolonged stable disease [SD] (defined as ≥ 6 cycles, or ≥ 3 for DIPG). Stage 1 required ≥ 2/9 subjects, within each cohort, to have a response or prolonged SD to move into Stage 2, and ≥ 5/20 responders or patients with prolonged SD at the end of Stage 2 for pom to be deemed effective. Results: Of 52 treated patients (median age 11.5 y/o; range 4-18), 47 were evaluable for primary endpoint. Median treatment duration was 2 cycles (range 1-16). Only the HGG cohort met protocol-defined criteria to advance to Stage 2, with one PR and one prolonged SD in Stage 1. Forty-six of 47 evaluable patients discontinued pom, due to adverse event (n = 1; pneumonia), withdrawal by parent/guardian (n = 2), death (n = 4; 3 progressive disease, 1 sepsis), or progressive disease (n = 39). Nineteen of 52 treated patients experienced ≥ 1 grade 3–4 treatment-emergent adverse event (TEAE) related to pom, neutropenia (n = 15) being the most commonly reported. Twenty-six patients died on study. All deaths were attributed to either disease progression or complications from disease. Conclusions: Single agent pomalidomide failed to meet a clinically meaningful level of efficacy in children with recurrent/progressive HGG, DIPG, medulloblastoma or ependymoma. However, it should be noted that a sustained response was observed in a child with HGG, replicating the outcome observed in one child with HGG in the Phase 1 (PBTC-043) trial. Clinical trial information: NCT03257631.


2019 ◽  
Vol 37 (15_suppl) ◽  
pp. 8562-8562
Author(s):  
Luis G. Paz-Ares ◽  
David R. Spigel ◽  
Christoph Zielinski ◽  
Yuanbin Chen ◽  
Maria Jove ◽  
...  

8562 Background: Nal-IRI is investigated as monotherapy in patients with SCLC who progressed on or after platinum regimen. The RESILIENT study is a Part 1 study of a Phase 2/3 trial to assess safety, tolerability, and efficacy of Irinotecan Liposome Injection in patients with SCLC. Methods: Nal-IRI is evaluated in patients ≥18 yrs with advanced SCLC with an ECOG performance status ≤1 and adequate organ function; prior exposure to immunotherapy is allowed. Safety and tolerability at dose levels of 85 mg/m2 and 70 mg/m2 are the primary endpoints, with assessment of exploratory efficacy signal. Results: At 24 Dec 2018 safety cutoff 12 patients in Part 1 received ≥1 dose of nal-IRI (Cohort 1 [C-1] at 85 mg/m2 dose n=4; Cohort 2 [C-2] at 70 mg/m2 dose n=8; median age 60.0 yrs; range 49–73 yrs). Three patients experienced ≥1 DLT (Cohort 1 n=3/4; Cohort 2 n=0/8). Most frequent treatment-emergent adverse events (TEAE) were gastrointestinal (GI) disorders (any grade): diarrhea (91.7%), nausea (58.3%), vomiting (41.7%), decreased appetite (58%), abdominal pain (33%) manageable by antidiarrheal regimen and antiemetics; as well as fatigue (50%) and asthenia (37.5%). Overall, hematologic toxicity was neutropenia (any grade) at 16.7% and anemia (any grade) at 16.7%. At 11 Dec 2018 efficacy cutoff the best objective response was partial response (PR) at 33.3% in 4/12 patients (C-1 n=1/4; C-2 n=3/8), median time to response was 6 wks. Overall disease control rate (DCR) was 58.3%; progressive disease (PD) was observed in 2 patients (16.7%), and 3 patients were non-evaluable (25%). Conclusions: Initial assessment suggests that nal-IRI at 70 mg/m2 dose given bi-weekly is well-tolerated and has promising antitumor activity in patients with SCLC who progressed on or after platinum regimen. Part 1 dose expansion is ongoing. Clinical trial information: NCTN03088813. [Table: see text]


2020 ◽  
Vol 38 (15_suppl) ◽  
pp. 10018-10018 ◽  
Author(s):  
Danny Rischin ◽  
Nikhil I. Khushalani ◽  
Chrysalyne D. Schmults ◽  
Alexander David Guminski ◽  
Anne Lynn S. Chang ◽  
...  

10018 Background: Cemiplimab monotherapy achieves clinically meaningful activity in pts with advanced CSCC (metastatic [mCSCC] or locally advanced [laCSCC] not amenable to curative surgery or curative radiation) and has a safety profile consistent with other anti–PD-1 agents. Based on initial data (median follow-up of 9.4 months in the pivotal study, NCT02760498), cemiplimab (cemiplimab-rwlc in the US) was approved for the treatment of pts with advanced CSCC. Historical data shows median overall survival (OS) of approximately 15 months with conventional chemotherapy or EGFR inhibitors (ASCO 2019, e21033). We present ~1-year additional follow-up from the largest prospective data set in advanced CSCC. Methods: Pts received cemiplimab 3 mg/kg Q2W (Group [Gp] 1; mCSCC; Gp 2, laCSCC) or cemiplimab 350 mg Q3W (Gp 3, mCSCC). The primary endpoint was objective response rate (ORR; complete response + partial response) per independent central review (ICR). Data presented here are per investigator review (INV); ICR data will be available at the meeting. Results: 193 pts were enrolled (Gp 1, n = 59; Gp 2, n = 78; Gp 3, n = 56). 128 pts had received no prior anti-cancer systemic therapy, 65 pts were previously treated. As of Oct 11, 2019 (data cut-off), median duration of follow-up was 15.7 months (range: 0.6–36.1) among all pts; 18.5 months (range: 1.1–36.1) for Gp 1, 15.5 months (range: 0.8–35.0) for Gp 2, and 17.3 months (range: 0.6–26.3) for Gp 3. ORR per INV was 54.4% (95% CI: 47.1–61.6) for all pts; 50.8% (95% CI: 37.5–64.1) for Gp 1, 56.4% (95% CI: 44.7–67.6) for Gp 2, and 55.4% (95% CI: 41.5–68.7) for Gp 3. ORR per INV was 57.8% (95% CI: 48.8–66.5) among treatment-naïve pts and 47.7% (95% CI: 35.1–60.5) among previously treated pts. Median duration of response (DOR) has not been reached (observed DOR range: 1.8–34.2 months). In responding pts, estimated proportion of pts with ongoing response at 24 months was 76.0% (95% CI: 64.1–84.4). Median OS has not been reached. Estimated OS at 24 months was 73.3% (95% CI: 66.1–79.2). The most common treatment-emergent adverse events (TEAEs) by any grade were fatigue (34.7%), diarrhea (27.5%), and nausea (23.8%). The most common grade ≥3 TEAEs were hypertension (4.7%) and anemia and cellulitis (each 4.1%). Conclusions: For pts with advanced CSCC, cemiplimab achieves ORRs, DOR and survival superior to what has been reported with other agents. Clinical trial information: NCT02760498.


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