Stage II-IIIB Research Articles

EP.07C.08 Surgical Factors and Adjuvant Therapy Use after Neoadjuvant Therapy for Patients with Resected Stage II-IIIB(N2) NSCLC

EP.07C.08 Surgical Factors and Adjuvant Therapy Use after Neoadjuvant Therapy for Patients with Resected Stage II-IIIB(N2) NSCLC

P1.08C.01 Targeted Therapy or Chemotherapy as Neoadjuvant Treatment for Resectable Stage II-IIIB EGFRm Lung Adenocarcinoma: A Study Between Four Cohorts

P1.08C.01 Targeted Therapy or Chemotherapy as Neoadjuvant Treatment for Resectable Stage II-IIIB EGFRm Lung Adenocarcinoma: A Study Between Four Cohorts

Neoadjuvant letrozole and palbociclib in patients with HR-positive/HER2-negative early breast cancer and Oncotype DX Recurrence Score ≥18: DxCARTES study

The effect of the addition of cyclin-dependent kinases 4 and 6 inhibitors to endocrine therapy in terms of molecular downstaging remains undetermined. Switching from a high-risk to a low risk Recurrence Score (RS) group could provide useful information to identify patients who might not require chemotherapy. The purpose of this study was to assess the biological and clinical activity of letrozole plus palbociclib as neoadjuvant treatment for patients with hormone receptor (HR)-positive/human epidermal growth factor receptor 2 (HER2)-negative early breast cancer with an initial Oncotype DX RS ≥18. Participants were women aged ≥18 years with HR-positive/HER2-negative, Ki67 ≥ 20%, stage II-IIIB early breast cancer with a baseline RS ≥18. Eligible patients with a pretreatment RS 18-25 (cohort A) and 26-100 (cohort B) received six 28-day cycles of letrozole (2.5 mg per day; plus goserelin if pre- or perimenopausal) plus palbociclib (125 mg per day; 3/1 schedule) before surgery. The primary endpoint for both cohorts was the proportion of patients who achieved an RS ≤25 at surgery or a pathological complete response (pCR). A total of 67 patients were enrolled, among which 65 were assessable for the primary endpoint (32 patients in cohort A and 33 in cohort B). At surgery, 22 (68.8%) patients in cohort A and 18 (54.5%) patients in cohort B had an RS ≤25 or a pCR [only 1 (3.0%) patient in cohort B], meeting the primary endpoint in cohort B (P < 0.01), but not in cohort A (P= 0.98). No new safety signals were identified. The efficacy of neoadjuvant treatment with letrozole plus palbociclib does not seem to depend on pretreatment RS for patients with RS ≥18. However, around half of patients with HR-positive/HER2-negative early breast cancer with an RS 26-100 at baseline achieved molecular downstaging with this regimen.

P3.08F.07 Efficacy and Safety of Envafolimab Plus Platinum-based Chemotherapy as Neoadjuvant Therapy in Resectable Stage II-IIIB NSCLC

P3.08F.07 Efficacy and Safety of Envafolimab Plus Platinum-based Chemotherapy as Neoadjuvant Therapy in Resectable Stage II-IIIB NSCLC

Neoadjuvant toripalimab plus chemotherapy for resectable stage II-IIIB non-squamous non-small cell lung cancer with EGFR mutations: A multi-center, multi-cohort, exploratory study.

TPS8120 Background: Neoadjuvant immunotherapy has been widely applied in the treatment of resectable stage II-IIIB NSCLC patients without driver gene mutation. However, as for the EGFR-positive patients, the therapeutic effect of neoadjuvant treatment, either TKI or chemotherapy, is far from satisfied and the outcome of neoadjuvant immunotherapy plus chemotherapy in these patients remains an unanswered but crucial question. Herein, we conducted a phase 2 prospective trial (NCT05962021). Methods: This is a multicenter, multi-cohort prospective phase 2 study in the treatment-naïve patients with resectable stage II-IIIB (N2) (AJCC 8th edition) non-squamous NSCLC harboring EGFR mutations (19DEL or L858R). Enrolled patients will be divided into two cohorts according to EGFR status and receive neoadjuvant toripalimab (240mg, q3w) plus platinum-based doublet chemotherapy (pemetrexed 500mg/m2 plus carboplatin AUC 5, q3w) for 3 cycles. Surgery will be performed after completion of neoadjuvant therapy based on the multidisciplinary discussion, while local radiotherapy will be considered if the patient cannot undergo surgery due to disease progression. Key inclusion criteria: non-squamous NSCLC, resectable stage II-IIIB (N2), EGFR mutations (19DEL or L858R), age≥18 years, ECOG PS 0-1 and adequate cardiopulmonary function. Exclusion criteria: prior systemic anticancer treatment, contraindication to immunotherapy, active autoimmune disease. Adequate pre-treatment tissue samples are required for RT-PCR or next-generation sequencing to determine the EGFR mutation status and PD-L1 expression immunohistochemical detection. The primary study endpoint is complete pathological response (pCR) rate, per blinded independent pathologist review. Simon's optimal two-stage design will be used to test the null hypothesis of pCR rate ≤5% and alternative hypothesis of pCR rate ≥15%, and 5 or more pCRs among 56 patients per arm are needed for the primary endpoint to be met. Secondary endpoints include major pathological response (MPR) rate, pCR/MPR rate in different EGFR mutation subgroups (19DEL or L858R) and different PD-L1 expression subgroups (TPS &lt; 1% and ≥ 1%), event-free survival and safety and tolerability. Peripheral blood, stool and tissue samples will be obtained longitudinally at baseline, during perioperation and at follow-ups for exploratory analysis. Clinical trial information: NCT05962021 .

Abstract CT238: Associations of ctDNA levels during neoadjuvant treatment with pathological response in patients with resectable NSCLC from the phase 3 AEGEAN trial

Abstract Background: In AEGEAN, perioperative durvalumab (D) + neoadjuvant (neoadj) chemotherapy (CT) significantly improved pathological complete response (pCR) and event-free survival (primary endpoints), and major pathological response (MPR; key secondary endpoint), with manageable safety vs neoadj CT alone in patients with resectable NSCLC. We report exploratory ctDNA analyses during neoadj treatment (Tx) and associations of ctDNA dynamics and clearance with pathological response, including pCR, MPR and percentage residual viable tumor (%RVT). Methods: AEGEAN is a double-blind placebo (PBO)-controlled study (NCT03800134). Adults with Tx-naïve resectable NSCLC (stage II-IIIB[N2]; AJCC 8th ed) were randomized (1:1) to receive neoadj CT + D or PBO IV (Q3W, 4 cycles) prior to surgery (Sx), followed by D or PBO IV (Q4W, 12 cycles), respectively, after Sx. Evaluable resected samples from patients in the modified intent-to-treat (mITT) population (patients without known EGFR/ALK aberrations) were assessed centrally for %RVT and determination of pCR (absence of any RVT in resection specimen, including primary tumor and all sampled lymph nodes) and MPR (≤10% RVT in primary tumor) per IASLC recommendations. Plasma samples were collected prior to each neoadj Tx cycle (at baseline [BL], C2D1, C3D1, and C4D1) and before Sx. ctDNA analysis was performed using patient-specific, tumor-informed assays, following identification of mutations in Tx-naïve, diagnostic biopsies by whole exome sequencing. ctDNA variant allele fractions (VAFs; mutant sequences as a % of total sequence reads at ctDNA panel sites) and dynamics, including ctDNA clearance, were assessed during neoadj Tx, and their potential associations with pCR, MPR, or %RVT were evaluated. Results: ctDNA was evaluated in 831 samples from 186 patients (D arm, n=90; PBO arm, n=96) in the mITT population from the interim pCR analysis cohort (n=402). ctDNA dynamics were assessed during neoadj Tx in relation to whether patients had a pathological response at surgery; patients without surgery were designated as non-responders. BL VAF levels were not significantly different between patients who had tumors with vs without pCR (D arm, P=0.09; PBO arm, P=0.7) or MPR (D arm, P=0.4; PBO arm, P=0.8); however, on-Tx VAF levels were significantly lower in the D arm from C2D1 onwards in patients with vs without pCR (P≤0.001) or MPR (P≤0.01) and in the PBO arm from C3D1 for pCR (P≤0.003) or C2D1 for MPR (P≤0.002). %RVT was significantly lower in patients with vs without ctDNA clearance from C2D1 onwards in the D arm (median, &amp;lt;5% vs ≥30%, P≤0.01) and from C3D1 onwards in the PBO arm (median, 10% vs ≥50%, P≤0.0004). Conclusions: In AEGEAN, reduced VAF levels during neoadj Tx appeared associated with pCR or MPR. Patients in whom ctDNA clearance was observed tended to have a lower %RVT, from C2D1 in the D arm and from C3D1 in the PBO arm. Citation Format: Davina Gale, Zhou Zhu, Zhongwu Lai, Martin Reck, David Harpole, Janis M. Taube, Tetsuya Mitsudomi, Maximilian Hochmair, Thomas Winder, László Urbán, Jeronimo Rodriguez-Cid, Quincy Chu, Jamie Chaft, Ross Stewart, Darren Hodgson, Gary J. Doherty, John V. Heymach. Associations of ctDNA levels during neoadjuvant treatment with pathological response in patients with resectable NSCLC from the phase 3 AEGEAN trial [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2024; Part 2 (Late-Breaking, Clinical Trial, and Invited Abstracts); 2024 Apr 5-10; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2024;84(7_Suppl):Abstract nr CT238.

Abstract CT281: The phase 3 INTerpath-002 study design: Individualized neoantigen therapy (INT) V940 (mRNA-4157) plus pembrolizumab vs placebo plus pembrolizumab for resected early-stage non-small-cell lung cancer (NSCLC)

Abstract Background: Pembrolizumab (pembro; anti-PD-1) is indicated as adjuvant monotherapy following resection and adjuvant chemotherapy in patients (pts) with stage IB (T2a ≥4 cm), II, or IIIA NSCLC (per AJCC v7). However, many pts experience disease recurrence, and have limited treatment options available. V940 (mRNA-4157) is a novel individualized neoantigen therapy that encodes up to 34 neoantigens that is specifically tailored and manufactured for each pt derived from their tumor. V940 as monotherapy and in combination with pembro has shown preliminary antitumor activity in the phase 1 KEYNOTE-603 study in several solid tumor types, including NSCLC. Additionally, in pts with completely resected, high-risk stage IIIB/C/D and IV cutaneous melanoma in the KEYNOTE-942 primary analysis, V940 plus pembro demonstrated significant improvements in recurrence-free survival (HR, 0.561 [95% CI, 0.309-1.017]; P = 0.0266) and distant metastasis-free survival (HR, 0.347 [95% CI, 0.145-0.828]; P = 0.0063) vs pembro alone. Here we present the design of the phase 3, randomized, double-blind INTerpath-002 study (NCT06077760) of adjuvant V940 plus pembro vs placebo plus pembro in pts with completely resected and chemotherapy-treated stage II-IIIB (N2) NSCLC (AJCC v8). Methods: Eligible pts aged ≥18 years with completely resected stage II, IIIA, or IIIB (N2) squamous or nonsquamous NSCLC (per AJCC v8.0) where EGFR-directed therapy is not indicated as primary therapy (ie, absence of sensitizing EGFR mutations e.g. DEL19 or L858R), who have received 1-4 doses of adjuvant platinum-doublet chemotherapy, have ECOG PS 0 or 1, and have available tumor tissue for next-generation sequencing and PD-L1 testing will be enrolled. Pts must not have received previous neoadjuvant therapy for NSCLC and must not have received or be candidates for adjuvant radiotherapy. Pts will be randomized 1:1 to receive V940 1 mg IM or placebo Q3W for up to 9 doses plus pembro 400 mg IV Q6W for up to 9 cycles or until disease recurrence, pt withdrawal, unacceptable toxicity, or an additional malignancy requiring treatment. Randomization will be stratified by histology (squamous vs nonsquamous), PD-L1 TPS (&amp;lt;1% vs 1%-49% vs ≥50%), disease stage (II vs III), and geographic location (North America/Western Europe/Australia vs rest of world). The primary endpoint is disease-free survival per investigator review. Secondary endpoints include distant metastasis-free survival per investigator assessment, OS, lung cancer‒specific survival, patient-reported outcomes, and safety. Tumor imaging will occur at baseline, every 12 wk until wk 48, every 24 wk through year 3, and every 48 wk thereafter. Enrollment began in October 2023 and is ongoing globally (NCT06077760). Citation Format: Jonathan D. Spicer, Santosh M. Nair, Adnan Khattak, Jay M. Lee, Michelle Brown, Robert S. Meehan, Nazly Shariati, Xuan Deng, Ayman Samkari, Jamie E. Chaft. The phase 3 INTerpath-002 study design: Individualized neoantigen therapy (INT) V940 (mRNA-4157) plus pembrolizumab vs placebo plus pembrolizumab for resected early-stage non-small-cell lung cancer (NSCLC) [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2024; Part 2 (Late-Breaking, Clinical Trial, and Invited Abstracts); 2024 Apr 5-10; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2024;84(7_Suppl):Abstract nr CT281.

Neoadjuvant vs Adjuvant Chemoimmunotherapy for Stage II-IIIB Non-Small Cell Lung Cancer

BackgroundIn patients with resectable non-small cell lung cancer (NSCLC), recent trials demonstrate survival benefit of chemoimmunotherapy over chemotherapy alone in both the neoadjuvant and adjuvant settings. To date, there is no direct comparison between neoadjuvant and adjuvant protocols. We compared neoadjuvant vs adjuvant chemoimmunotherapy for resectable stage II-IIIB NSCLC. MethodsWe queried the National Cancer Database for patients who had undergone an operation for stage II-IIIB NSCLC and who had received neoadjuvant or adjuvant chemoimmunotherapy between 2015 and 2020. We used inverse probability weighting to adjust for confounding variables and used Kaplan-Meier survival curves and Cox regression to explore the relationship between treatment groups and overall survival (OS) at 3 years postoperatively. ResultsThe inverse probability-weighted cohort represented 2119 weighted patient cases (neoadjuvant, 1034; adjuvant, 1085). Kaplan-Meier analysis demonstrated a significant OS benefit for neoadjuvant chemoimmunotherapy compared with adjuvant chemoimmunotherapy in the weighted cohort (3-year OS: 77% [95% CI, 71%-83%] vs 68% [95% CI, 64%-72%]; P = .035). On adjusted Cox regression, neoadjuvant chemoimmunotherapy was associated with a significant OS benefit (hazard ratio, 0.70; 95% CI, 0.50-0.96; P = .027). Among patients for whom pathologic stage data were available, 25% of patients receiving neoadjuvant chemoimmunotherapy had a pathologic complete response, with an additional 32.5% being downstaged. ConclusionsNeoadjuvant chemoimmunotherapy confers a significant OS benefit over adjuvant chemoimmunotherapy for patients with resectable stage II-IIIB NSCLC. Although randomized trials are needed to confirm our findings, strong consideration should be given to administering neoadjuvant chemoimmunotherapy to patients who are predetermined to receive systemic treatment.

P1.25-09 TARGET: A Phase II Study of 5-year Adjuvant Osimertinib in Completely Resected EGFR-mutated Stage II-IIIB NSCLC

P1.25-09 TARGET: A Phase II Study of 5-year Adjuvant Osimertinib in Completely Resected EGFR-mutated Stage II-IIIB NSCLC

EP07.05-02 NEOEAST: A Phase II Study of Ensartinib as Neoadjuvant Therapy for Stage II-IIIB ALK-rearranged Non-small Cell Lung Cancer

EP07.05-02 NEOEAST: A Phase II Study of Ensartinib as Neoadjuvant Therapy for Stage II-IIIB ALK-rearranged Non-small Cell Lung Cancer

A randomized, double blinded, multicenter phase 3 study of platinum-based chemotherapy with or without QL1706 as adjuvant therapy in completely resected stage II-IIIb NSCLC.

TPS8606 Background: Adjuvant atezolizumab is approved for PD-L1 positive stage II-IIIA NSCLC in USA and China. To date, there are few clinical studies on dual immune checkpoint inhibitors in adjuvant settings of NSCLC. QL1706, a MabPair product, is a novel bifunctional antibody containing a mixture of anti-PD-1 IgG4 and anti-CTLA-4 IgG1 antibodies. QL1706 monotherapy has demonstrated good safety and promising antitumor activity in advanced solid tumors in a phase Ia/Ib study with 518 patients, including 146 NSCLC patients. Meanwhile, in NSCLC patients with negative oncogene drivers, QL1706 plus 2 cycles of chemotherapy as first line treatment resulted in an ORR of 58.6% (17/29) and the mPFS was 6.97 months. Furthermore, in the EGFR mutant NSCLC patients who previously were treated with EGFR-TKI, QL1706 plus platinum-based chemotherapy and bevacizumab showed promising efficacy with an ORR of 64.5% (20/31). This study is designed to investigate the efficacy and safety of QL1706 or placebo plus platinum doublet chemotherapy as adjuvant treatment in stage II-IIIB NSCLC. Methods: In this phase Ⅲ, randomized, double-blind, placebo-controlled, multicenter study, 632 eligible pts, who is completely resected stage Ⅱ-ⅢB NSCLC (AJCC 8th) with negative EGFR, ALK etc, will be enrolled. Pts will be randomized 1:1 to receive QL1706 (5 mg/kg) or placebo plus chemotherapy, administered every 3 weeks (Q3W). The regimen of vinorelbine/paclitaxel plus cisplatin/carboplatin is chosen for squamous NSCLC, while pemetrexed/vinorelbine plus cisplatin/carboplatin for non-squamous NSCLC. Randomization will be stratified by PD-L1 TPS (ie, &lt; 1%, ≥1%), disease stage (stage II, III) and predominant tumor histology (ie, squamous vs non-squamous). The primary endpoint is disease-free survival (DFS) per investigators in PD-L1 TPS ≥1% pts and in all randomized pts, which will be tested hierarchically. An interim analysis is to occur when about 70% DFS events achieved in pts with PD-L1≥1%. Enrollment began in Nov, 2022. ClinicalTrials.gov NCT05487391. Clinical trial information: NCT05487391 .

Abstract CT005: AEGEAN: A phase 3 trial of neoadjuvant durvalumab + chemotherapy followed by adjuvant durvalumab in patients with resectable NSCLC

Abstract Background: Recent trials have demonstrated the clinical benefit of immunotherapy in either the neoadjuvant or adjuvant resectable (R) NSCLC setting. AEGEAN (NCT03800134) is a randomized, double-blind, placebo (PBO)-controlled trial assessing neoadjuvant durvalumab (D) + chemotherapy (CT) followed by surgery (Sx) and adjuvant D in patients (pts) with R-NSCLC. Methods: Adults with treatment (Tx)-naïve R-NSCLC (stage II-IIIB[N2]; AJCC 8th ed) and ECOG PS 0/1 were randomized (1:1) to receive D 1500 mg or PBO IV + platinum-based CT (every 3 weeks [Q3W] for 4 cycles) before Sx, then further D 1500 mg or PBO IV (Q4W, up to 12 cycles). Pts were stratified by disease stage (II vs III) and PD-L1 tumor cell expression (&amp;lt;1% vs ≥1%, Ventana SP263). Pts with documented EGFR/ALK aberrations were excluded from the modified intent-to-treat (mITT) population for efficacy analyses. The primary endpoints were pathological complete response (pCR), evaluated centrally, and event-free survival (EFS; using RECIST v1.1), evaluated by BICR. Safety was assessed in all pts who received ≥1 study Tx dose. Results: Between Jan 2, 2019, and Apr 19, 2022, 802 pts were randomized to the ITT population (n=740 in the mITT population) of whom 799 received Tx (D arm, n=400; PBO arm, n=399). Baseline characteristics were largely balanced (mITT). Overall, 84.7% in the D arm and 87.2% in PBO arm completed 4 cycles of platinum-doublet CT and 77.6% and 76.7%, respectively, completed Sx (mITT). As of Nov 10, 2022 (data cutoff), median EFS follow-up in censored pts was 11.7 months (mITT). The pCR rate was significantly higher and EFS significantly prolonged in the D vs PBO arms (mITT) (Table). In the safety analysis set, maximum grade 3/4 any-cause AEs occurred in 42.3% vs 43.4% in the D and PBO arms, respectively, during the overall Tx period. Conclusions: The AEGEAN trial met both of its primary endpoints of improved pCR and EFS. Perioperative D plus neoadjuvant CT was associated with a manageable safety profile. Clinical trial identification: NCT03800134 (release date: January 11, 2019) Endpoint D arm PBO arm Tx effect P value pCR n/N: 63/366 (17.2%) n/N: 16/374 (4.3%) Difference in pCR (95% CI), %: 13.0 (8.7-17.6)a 0.000036 (assessed at IA)b EFS n events/N: 98/366 (26.8%) n events/N: 138/374 (36.9%) HR (95% CI): 0.68 (0.53-0.88)d 0.003902e Median (95% CI), months: NR (31.9-NR)c Median (95% CI), months: 25.9 (18.9-NR)c aCIs by stratified Miettinen and Nurminen’s method. bStatistical significance was achieved at the IA (402 pts; data cutoff, Jan 14, 2022); no testing was performed at FA. The statistically significant p-value of 0.000036 was based on a Cochran-Mantel-Haenszel test. cKaplan-Meier method. dStratified Cox proportional hazards model. eStratified log-rank test. CI, confidence interval; FA, final analysis; HR, hazard ratio; IA, interim analysis; NR, not reached. Citation Format: John V. Heymach, David Harpole, Tetsuya Mitsudomi, Janis M. Taube, Gabriella Galffy, Maximilian Hochmair, Thomas Winder, Ruslan Zukov, Gabriel Garbaos, Shugeng Gao, Hiroaki Kuroda, Jian You, Kang-Yun Lee, Lorenzo Antonuzzo, Mike Aperghis, Gary J. Doherty, Helen Mann, Tamer M. Fouad, Martin Reck. AEGEAN: A phase 3 trial of neoadjuvant durvalumab + chemotherapy followed by adjuvant durvalumab in patients with resectable NSCLC [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2023; Part 2 (Clinical Trials and Late-Breaking Research); 2023 Apr 14-19; Orlando, FL. Philadelphia (PA): AACR; Cancer Res 2023;83(8_Suppl):Abstract nr CT005.

Osimertinib as neoadjuvant therapy in patients with EGFR-mutant resectable stage II-IIIB lung adenocarcinoma (NEOS): A multicenter, single-arm, open-label phase 2b trial

ObjectivesOsimertinib, a third-generation epidermal growth factor receptor (EGFR) tyrosine kinase inhibitor (TKI), has been approved for EGFR-mutant non-small-cell lung cancer (NSCLC). We aimed to evaluate the efficacy and safety of neoadjuvant osimertinib in patients with EGFR-mutant resectable locally advanced NSCLC. Materials and MethodsThis single-arm, phase 2b trial (ChiCTR1800016948) was conducted at six centers in mainland China. Patients with a measurable stage IIA-IIIB (T3-4 N2) lung adenocarcinoma and EGFR exon 19 and/or 21 mutations were enrolled. The patients were treated with osimertinib 80 mg orally once per day for six weeks, followed by surgical resection. The primary endpoint was the objective response rate (ORR) assessed according to the Response Evaluation Criteria In Solid Tumors version 1.1. ResultsBetween October 17, 2018, and June 08, 2021, 88 patients were screened for eligibility. Forty patients were enrolled and treated with neoadjuvant osimertinib therapy. The ORR was 71.1 % (27/38) (95 % confidence interval: 55.2–83.0) in 38 patients who completed the 6-week osimertinib treatment. Thirty-two patients underwent surgery, and 30 (93.8 %) underwent successful R0 resection. Thirty (75.0 %) of 40 patients had treatment-related adverse events during neoadjuvant treatment, and three (7.5 %) had treatment-related adverse events of grade 3. The most common treatment-related adverse events were rash (n = 20 [50 %]), diarrhea (n = 12 [30 %]), and oral ulceration (n = 12 [30 %]). ConclusionsThe third-generation EGFR TKI osimertinib, with satisfying efficacy and acceptable safety profile, could be a promising neoadjuvant therapy in patients with resectable EGFR-mutant NSCLC.

Study protocol of an open-label prospective phase II umbrella study of precise neoadjuvant therapy for patients with stage II-IIIB resectable non-small cell lung cancer (PURPOSE).

The outcomes of locally advanced non-small cell lung cancer (LA-NSCLC) are unfavorable mainly due to a high risk of cancer recurrence. Only around 5% of patients can benefit from perioperative chemotherapy which is the current standard treatment. Recently, promising results with neoadjuvant targeted and immune-therapy therapy have been seen. However, most clinical trials are looking for patients eligible for certain drugs, instead of seeking suitable treatments for certain patients. Therefore, it is necessary to look for more efficient perioperative therapies to increase resectability, reduce recurrence and improve prognosis. The study is an open-label, prospective, phase II, umbrella trial, enrolling patients diagnosed with treatment-naïve potentially resectable Stage II-IIIB NSCLC. Next-generation sequencing (NGS) using a 68-gene panel is performed for biopsies of tumor tissues from eligible patients. Enrolled patients are then stratified into six independent cohorts based on the status of gene mutations and PD-L1 status in tumor tissues, that is, ①EGFR 19del group, ②EGFR 21 L858R group, ③EGFR rare mutation group, ④Other driver mutation group, ⑤Drive mutation-negative group with PD-L1≥1%, ⑥Drive mutation-negative group with PD-L1<1%. A Simon's two-stage design is performed in each cohort independently and patients receive corresponding standard therapies accordingly. We aim to enroll 26 patients in each cohort and totally 156 patients will be enrolled. The primary endpoint is objective response rate (ORR). Secondary endpoints include oncological prognosis and perioperative outcomes. Exploratory endpoint is to investigate patient-specific minimal residual disease (MRD) in predicting treatment efficacy and oncological prognosis. This is the first umbrella trial focusing on the safety and efficacy of precise neoadjuvant therapy for patients diagnosed with potentially resectable LA-NSCLC based on NGS results. The results of this trial would help improve overall treatment results in LA-NSCLC patients. Chinese Clinical Trial Registry. Trial registration number: ChiCTR2100053021. There is no neoadjuvant umbrella trial focusing on LA-NSCLCs. This is the first neoadjuvant umbrella trial, using a precise individualized approach and seeking suitable drugs for LA-NSCLC patients, with the aim to improve overall treatment outcomes. https://www.chictr.org.cn/, identifier ChiCTR2100053021.

967TiP An open-label, prospective, phase II, umbrella study of precise neoadjuvant therapy for patients with stage II-IIIB resectable non-small cell lung cancer (PURPOSE)

Survival outcomes of locally advanced non-small cell lung cancer (LA-NSCLC) are unfavorable and benefit from perioperative chemotherapy is only around 5%. Recently, promising results with neoadjuvant immunotherapy and targeted therapy have been shown. However, almost all the clinical trials are looking for eligible patients for certain drugs, instead of seeking suitable treatments for certain patients. Therefore, we are carrying out the first umbrella trial on precise neoadjuvant therapy for resectable LA-NSCLCs based on next-generation sequencing (NGS) and multidisciplinary team (MDT).

EP05.02-008 Phase II Trial of Neoadjuvant Icotinib Plus Chemotherapy for Stage II-IIIB EGFR-mutant Non-small-Cell Lung Cancer

Icotinib is a novel and selective epidermal growth factor receptor (EGFR)-tyrosine kinase inhibitors (TKI) for oral usage. Adjuvant therapy with icotinib has been confirmed to be associated with the improvement of DFS among patients with EGFR-mutant non-small-cell lung cancer (NSCLC) in several studies. However, the clinical benefit of neoadjuvant icotinib combined with chemotherapy for EGFR-mutant NSCLC remains unknown. This is the first trial evaluating the efficacy and safety of icotinib plus chemotherapy as neoadjuvant therapy for patients with stage II-IIIB EGFR-mutant NSCLC.

81MO Osimertinib as neoadjuvant therapy in patients with EGFR mutated resectable stage II-IIIB lung adenocarcinoma (NEOS): Updated results

Previously, the interim analysis of the multicenter, single-arm, phase 2 NEOS study (ChiCTR1800016948) demonstrated the promising efficacy and tolerable safety profile of neoadjuvant osimertinib in patients with resectable EGFR mutated NSCLC. Here we present the final efficacy and safety results of neoadjuvant osimertinib.

Abstract P5-16-12: Neoadjuvant letrozole plus palbociclib in patients (pts) with hormone receptor (HR)-positive/HER2-negative early breast cancer (EBC) with baseline Ki67 ≥20% and an Oncotype DX Breast Recurrence Score® result (RS) ≥18: DxCARTES

Abstract Background: Cyclin-dependent kinases 4 and 6 inhibitors in combination with endocrine therapy frequently lead to a complete cell-cycle arrest (CCCA) in luminal EBC. However, the rates of pathological complete response (pCR) or Residual Cancer Burden (RCB) 0-I are modest. The effect of this treatment in terms of molecular downstaging as assessed by a genomic signature more refined than Ki67 remains undetermined. We aimed to assess the biological and clinical activity of letrozole plus palbociclib as neoadjuvant treatment in HR-positive/HER2-negative EBC pts with an Oncotype DX RS ≥18. Methods: DxCARTES was a multicenter, open-label, non-comparative, phase 2 trial across 16 hospitals in Spain. Participants were pre- and post-menopausal women aged ≥18 years with centrally confirmed HR-positive/HER2-negative, Ki67≥20%, stage II-IIIB EBC with a RS ≥18. Eligible pts with baseline RS 18-25 (cohort A) and RS 26-100 (cohort B) received six 28-days cycles of letrozole (2.5 mg QD), ± goserelin if premenopausal, plus palbociclib (125 mg QD, 3/1 schedule) before surgery. Tumor samples were prospectively collected at baseline and surgery for Ki67 and RS assessments. The coprimary endpoint was the proportion of pts in either cohort who achieved RS ≤25 or a pCR (ypT0/is ypN0) at surgery. Secondary endpoints included analysis of RCB, preoperative endocrine prognostic index (PEPI), CCCA (Ki67&amp;lt;2.7%), overall response rate (ORR) as per RECIST v.1.1, and safety as per CTCAE v.5.0. A Simon’s 2-stage design was planned to recruit 33 pts in each cohort. Interim futility analyses were planned with 12 and 18 pts included in cohort A and B, respectively. The analyses were designed to attain an 80% power, with a 10% drop out rate assumption, at a nominal 1-sided α level of 2.5%. The response probabilities for null (H0) and alternative hypotheses (H1) in cohort A were H0: ≤ 72% and H1: ≥ 93%, and in cohort B were H0: ≤ 13% and H1: ≥ 35%, respectively. Results: Between May 5, 2019 to Dec 30, 2019, 67 pts were enrolled and received the study treatment (33 pts allocated to cohort A and 34 pts to cohort B). Pts’ characteristics at diagnosis were well balanced between the two cohorts and of the 67 pts included, 32.8% were premenopausal, 49.3% had axillary node involvement, and median Ki67 was 27% (24-37.5%). A total of 32 pts from cohort A and 33 pts from cohort B were evaluable for the coprimary endpoint. Median duration of treatment was 5.6 months (IQR 5.5-5.8) and median time from the last dose of palbociclib and surgery was 10.5 days (IQR 5.5-14). At surgery, 22 of 32 (68.8%) pts in cohort A and 19 of 33 (57.6%) pts in cohort B had RS ≤25. No pts in cohort A and 2 of 33 (6.1%) pts in cohort B achieved a pCR, meeting the coprimary endpoint in cohort B, but not in cohort A. In cohort A, the proportion of pts with RCB 0-1 was 5.3%, PEPI 0 was 11.1%, and CCCA was 58.1%. In cohort B, the proportion of pts with RCB 0-1 was 23.1%, PEPI 0 was 33.3%, and CCCA was 59.4%. The ORR by breast MRI was 78.1% (25 of 32 pts) in cohort A and 63.6% (21 of 33 pts) in cohort B. The most common grade 3-4 adverse event in both cohorts was neutropenia (23 of 33 [69.7%] pts in cohort A vs 20 of 34 [58.8%] pts in cohort B). No deaths were observed during the study in either cohort. Conclusions: Our results suggest that the neoadjuvant palbociclib plus letrozole activity is independent of the molecular aggressiveness of the disease. Although the prognostic value of molecular downstaging is unknown, a significant proportion of HR-positive/HER2-negative EBC pts with high RS at baseline achieve a pathological or molecular downstaging with this regimen. Further investigation is needed to determine if this strategy could avoid the use of chemotherapy in this population. Citation Format: Antonio Llombart-Cussac, Ángel Guerrero-Zotano, Manuel Ruiz, Begoña Bermejo, Miguel Gil-Gil, Juan de la Haba, Emilio Alba, Vanesa Quiroga, Vicente Carañana, Ander Urruticoechea, Serafín Morales, Meritxell Bellet, Antonio Antón, José Manuel Pérez-García, María Fernández-Abad, Sonia Servitja, Pedro Sánchez-Rovira, Sofia Braga, Miguel Sampayo-Cordero, Andrea Malfettone, Javier Cortes. Neoadjuvant letrozole plus palbociclib in patients (pts) with hormone receptor (HR)-positive/HER2-negative early breast cancer (EBC) with baseline Ki67 ≥20% and an Oncotype DX Breast Recurrence Score® result (RS) ≥18: DxCARTES [abstract]. In: Proceedings of the 2021 San Antonio Breast Cancer Symposium; 2021 Dec 7-10; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2022;82(4 Suppl):Abstract nr P5-16-12.

Long-Term Cardiac Safety and Survival Outcomes of Neoadjuvant Pegylated Liposomal Doxorubicin in Elderly Patients or Prone to Cardiotoxicity and Triple Negative Breast Cancer. Final Results of the Multicentre Phase II CAPRICE Study.

BackgroundThe CAPRICE trial was designed to specifically evaluate neoadjuvant pegylated liposomal doxorubicin (PLD) in elderly patients or in those with other cardiovascular risk factors in whom conventional doxorubicin was contraindicated. The primary analysis of the study showed a pathological complete response (pCR) of 32% and no significant decreases in LVEF during chemotherapy. Here, we report important secondary study objectives: 5-year cardiac safety, disease-free survival (DFS), overall survival (OS) and breast cancer specific survival (BCSS).MethodsIn this multicentre, single-arm, phase II trial, elderly patients or those prone to cardiotoxicity and high risk stage II-IIIB breast cancer received PLD (35 mg/m2) plus cyclophosphamide (600 mg/m2) every 4 weeks for 4 cycles, followed by paclitaxel for 12 weeks as neoadjuvant chemotherapy (NAC). Left ventricular ejection fraction (LVEF) monitorization, electrocardiograms and cardiac questionnaires were performed at baseline, during treatment and at 9, 16, 28 and 40 weeks thereafter. The primary endpoint was pCR and 5-year cardiac safety, DFS, BCSS and OS were also analyzed.ResultsBetween Oct 2007, and Jun 2010, 50 eligible patients were included. Median age was 73 (35-84) years, 84% were older than 65; 64% of patients suffered from hypertension, and 10% had prior cardiac disease. Most of tumors (88%) were triple negative. No significant decreases in LVEF were observed. The mean baseline LVEF was 66.6% (52-86) and after a median follow-up of 5 years, mean LVEF was 66 (54.5-73). For intention to treat population, 5-year DFS was 50% (95% CI 40.2-68.1) and 5-year OS was 56% (95%CI 41.2-68.4). There were 8 non-cancer related deaths, achieving a 5 years BCSS of 67.74% (CI 95%:54.31%- 81.18%).ConclusionAt 5-year follow-up, this PLD-based NAC regimen continued to be cardiac-safe and effective in a population of very high-risk breast cancer patients. This scheme should be considered as an option in elderly patients or in those with other risks of developing cardiotoxicity.Trial Registration Number ClinicalTrials.gov reference NCT00563953.

Real-world treatment patterns and effectiveness outcomes in patients with early-stage triple-negative breast cancer.

Background: This retrospective, observational study examined real-world treatment patterns and effectiveness outcomes in 450 patients with stage II-IIIB early-stage triple-negative breast cancertreated in the community oncology setting. Methods: Kaplan-Meier methods were used to evaluate event-free survival (EFS), time to recurrenceand overall survival (OS). Cox regression models were used to evaluate predictors of EFS and OS by pathological complete response (pCR) status. Results: Among patients receiving neoadjuvant systemic therapy only, pCR was a predictor of EFS and OS. Conclusion: These results highlight the unmet need for therapies that improve outcomes for patients with early-stage triple-negative breast cancer including increasing rates of pCR among patients receiving neoadjuvant therapy.