Our results show that rapamycin displays antiproliferative effects and induces apoptosis in HNSCC cell lines, cellular effects being more potent in cells that do not express BCL2 and MDR1. Additive and synergistic effects were observed when rapamycin was combined with carboplatin and paclitaxel.
Panitumumab and irinotecan is an active third-line regimen in a well-defined population based on biomarkers. ClinicalTrials.gov Identifier NCT00655499.
6036 Background: ThePI3K/mTOR pathway is activated in >50% of HNSCC with preclinical synergism between everolimus and carboplatin/paclitaxel. Methods: Patients (pts) with untreated locally advanced HNSCC with ECOG PS<2 received 9 consecutive weekly (w) cycles (cy) of CAPRA combining everolimus (30 mg/w at dose-level 1 then 50 mg/w at dose-level 2) with carboplatin (AUC2) and paclitaxel (60 mg/m2) followed by chemoradiotherapy. Endpoints were safety (CTCv3.0), antitumor activity (RECIST1.1), pharmacodynamic biomarkers on tumor biopsy. Results: A total of 50 pts with stage IV HNSCC (41 males, 9 females, median age 61) were enrolled. Among 7 patients included in the phase I, no dose-limiting toxicity was reported and the recommended dose (RD) of everolimus was 50 mg/w. Safety evaluation in 46 pts treated at RD for 325 cy and a mean number cy/pt of 7.1 (95%CI: 6.3-7.8) showed grade (Gr) 1-2 adverse events consisting of asthenia (50%), nausea/vomiting (28%), alopecia (26%), mucositis (24%), and constipation (20%). Hematological toxicities (Gr1-2/3-4) were neutropenia (35%/39%), anemia (61%/17%), and thrombocytopenia (54%/13%). Everolimus-related Gr3 toxicities were rashes (1pt), pruritus (1pt), dyspnea (1pt), hyperglycemia (2pts), and Gr1-2 hypercholesterolemia (23pts). There was no toxic death. Among 38 pts evaluable for antitumor activity, one pt experienced a complete response (2.6%), 29 pts a partial response (76.3%), and 8 pts a stable disease (21%) for an overall response rate of 79% (no progression reported). Interestingly, 20 major responses (>50% reduction tumor volume) were observed in large necrotic primary tumors/N3 involvement. Efficacy was not correlated to KRAS/BRAF/PI3KCA/EGFR mutations. Significant decreases of Ki67/p-S6K activities were observed in post CAPRA biopsies compared to baseline. Conclusions: Weekly everolimus with carboplatin/paclitaxel as induction regimen was well tolerated with 11% grade 3 and no grade 4/5 toxicity. Translational data showed direct effects of everolimus in tumors. CAPRA yields high rate of objective responses in patients with locally advanced HNSCC. Clinical trial information: NCT01333085.
Mammalian target of rapamycin (mTOR) regulates cellular functions by integrating intracellular signals and signals from the tumor microenvironment (TME). The PI3K-AKT-mTOR pathway is activated in 70% of head and neck squamous cell carcinoma (HNSCC) and associated with poor prognosis. This phase I-II study investigated the effect of mTOR inhibition using weekly everolimus (30 mg for dose level 1, 50 mg for dose level 2) combined with weekly induction chemotherapy (AUC2 carboplatin and 60 mg/m2 paclitaxel) in treatment-naïve patients with locally advanced T3-4/N0-3 HNSCC. Patients received 9 weekly cycles before chemoradiotherapy. Objectives were safety and antitumor activity along with tissue and blood molecular biomarkers. A total of 50 patients were enrolled. Among 41 evaluable patients treated at the recommended dose of 50 mg everolimus weekly, tolerance was good and overall response rate was 75.6%, including 20 major responses (≥50% reduction in tumor size). A significant decrease in expression of p-S6K (p-value: 0.007) and Ki67 (p-value: 0.01) was observed in post-treatment tumor tissue. Pro-immunogenic cytokine release (Th1 cytokines IFN-γ, IL-2, and TNF-β) was observed in the peripheral blood. The combination of everolimus and chemotherapy in HNSCC was safe and achieved major tumor responses. This strategy favorably impacts the TME and might be combined with immunotherapeutic agents.
9511 Background: One quarter of patients with cancer are 75 year old and over. Previous studies suggested that geriatric parameters improved survival in elderly patients with solid advanced cancer and chemotherapy severe toxicity. A simplified scale would be helpful for oncologist to predict chemotherapy feasibility. The aim was to identify geriatric predictors of chemotherapy feasibility in chemo-naïve elderly patients. Methods: We conducted a prospective multicenter cohort study (NCT00664911). Inclusion criteria were: ≥ 75 years, solid tumor, able to receive at least 2/3 of the standard dose at the first course of treatment. Ten geriatric parameters were recorded at baseline by the oncologist: 1-three words test, 2-date and address for cognitive function, 3-Instrumental Activities of Daily Living (IADL), 4- monopodal stand-up test, 5-hospitalization during the previous year, 6-number of medicines taken for comorbidities, 7-creatinine clearance, 8-albumin serum level, 9-self-rated depressive mood question and 10-presence of a caregiver. The main outcome was chemotherapy feasibility defined by the ability to receive at least 3 months of the planned therapy. Multivariate logistic regression was used. Results: 576 patients were included in 49 centers from 2008 to 2012, 516 (89.6%) were eligible for analysis. Mean age was 81 years, 50.6% had colorectal cancer, 69.5% advanced stage and 83.6% had performance status 0-1. Chemotherapy feasibility was observed in 298 (57.8%) patients. Grade 3-4 toxicity was observed in 26.2% of patients. In multivariate analysis albuminemia < 30g/l (adjusted OR =2.34 CI95% [1.43-3.83]) and depressive mood (adjusted OR=1.55 CI95% [1.02-2.35]) were significantly associated with chemotherapy unfeasibility whereas others geriatrics parameters were not. Conclusions: Albuminemia and self rated depressive mood status were independently predictive for chemotherapy feasibility in elderly patients with solid tumor. Unexpectedly others geriatrics parameters were not independent predictors. Clinical trial information: NCT00664911.
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