Lung cancer in never smokers from the Princess Margaret Cancer Centre.

INTRODUCTION: Lung cancer in never smokers represents a distinct epidemiological, clinical, and molecular entity. RESULTS: Most 712 never smoking lung cancer patients were female (72%) with a median age at diagnosis of 62.2 years (18-94). Caucasians (46%), East Asians (42%), adenocarcinoma histology (87%) and presentation with metastatic disease at diagnosis (59%) were common. Of 515 patients with available archival tissue, the most common identified single mutations were EGFR (52.2%), followed by ALK (7.5%), KRAS (2.3%), TP53 (1.3%), ERBB2 (1%), BRAF (0.4%), PIK3CA (0.4%), SMAD4 (0.4%), CTNNB1 (0.2%), AKT1 (0.2%), and NRAS (0.2%); 8% tumors had multiple mutations, while 25.8% had none identified. Median overall survival (mOS) was 42.2 months (mo) for the entire cohort. Patients with mutations in their tumors had significantly better mOS (69.5 mo) when compared to those without (31.0 mo) (HR = 0.59; 95% CI: 0.44-0.79; p < 0.001). Earlier stage (p < 0.001), adenocarcinoma histology (p = 0.012), good performance status (p < 0.001) and use of targeted therapy (p < 0.001) were each independently associated with longer survival. Patients with ALK-translocation-positive tumours have significantly longer OS compared to those without any mutations (p = 0.0029) and to those with other and null mutations (p = 0.022). CONCLUSIONS: Lung cancer in never smokers represents a distinct clinical and molecular entity characterized by a high incidence of targetable mutations and long survival. METHODS: We analyzed retrospectively the data from electronic patient records of never smokers diagnosed with lung cancer treated at the Princess Margaret Cancer Centre (Toronto) between 1988-2015 to characterize demographic and clinical features, pathology, molecular profile (using hotspot or targeted sequencing panels), treatment and survival.

Canadian Cancer Trials Group (CCTG) IND211: A randomized trial of pelareorep (Reolysin) in patients with previously treated advanced or metastatic non-small cell lung cancer receiving standard salvage therapy.

OBJECTIVES: Pelareorep (reolysin), a Dearing strain of reovirus serotype 3, has demonstrated oncolytic activity as single agent and synergy with chemotherapy. We evaluated pelareorep, combined with standard second-line chemotherapy in patients with non-small cell lung cancer (NSCLC). MATERIALS AND METHODS: This randomized phase II trial enrolled patients with advanced or metastatic NSCLC after first line chemotherapy. After a safety run-in, patients were randomized 1:1 to chemotherapy (pemetrexed [500 mg/m2, non-squamous], or docetaxel [75 mg/m2], day 1 every 21 days]) +/- pelareorep (4.5 × 1010 TCID50, days 1-3 every 21 days), stratified by EGFR mutation status. The primary outcome was progression free survival (PFS) of patients randomized to chemotherapy + pelareorep vs. chemotherapy alone. Secondary outcomes included overall survival, objective response rate and exploratory translational analyses. RESULTS: Between October 2012 and August 2015, 166 patients were enrolled (14 to the safety run in). Pelareorep did not improve the PFS vs. single agent chemotherapy (median PFS 3.0 months, 95% confidence interval [CI] 2.6-4.1) vs. 2.8 months (95% CI 2.5-4.0), hazard ratio (HR) 0.90 (95% CI 0.65-1.25), P = 0.53). Neither KRAS or EGFR mutation was associated with improved PFS, but STK11 mutations did appear to have an association with improved PFS (HR 0.29 [0.12-0.67); as did PIK3CA mutation (HR 0.45 [0.22-0.93]). The combination was tolerable, although associated with increased rates of neutropenic fever. CONCLUSION: The addition of pelareorep to second-line chemotherapy did not improve the PFS of patients with NSCLC. The three-day pelareorep schedule was tolerable. Further research is needed to evaluate the potential benefit in molecular subtypes of NSCLC.

A Randomized Phase II Study of FOLFOX6/Bevacizumab With or Without Pelareorep in Patients With Metastatic Colorectal Cancer: IND.210, a Canadian Cancer Trials Group Trial.

BACKGROUND: Oncolytic reovirus pelareorep might preferentially infect and destroy rat sarcoma (RAS)-activated cells, and has preclinical and early clinical activity against colorectal cancer (CRC). PATIENTS AND METHODS: After a 6-patient safety run-in, 103 patients with metastatic CRC were randomly assigned to standard first-line leucovorin/5-FU/oxaliplatin (FOLFOX6)/bevacizumab (FOLFOX/BEV) every 2 weeks with (n = 51) or without (n = 52) pelareorep 3 × 1010 tissue culture infective dose 50 on days 1 to 5 (cycles 1, 2, 4, and alternate cycles thereafter). The primary end point was progression-free survival (PFS). Secondary end points included overall survival (OS), objective response rate (ORR), quality of life, and correlative analyses. RESULTS: At 13 months' median follow-up, PFS was inferior in the pelareorep arm (median 7 vs. 9 months; hazard ratio [HR], 1.59 [80% confidence interval (CI), 1.18-2.15]; P = .046). There was no statistical difference in OS (median, 19.2 vs. 20.1 months; HR, 1.22; P = .38). An increased ORR was observed with pelareorep (adjusted odds ratio, 2.52 [80% CI, 1.44-4.41]; P = .03), but with a shorter median duration of response (5 vs. 9 months; P = .028). Pelareorep patients experienced more hypertension and proteinuria, and were more likely to omit bevacizumab before progression. A trend to lower dose intensity and shorter oxaliplatin and bevacizumab treatment duration was observed with pelareorep. CONCLUSION: Combination pelareorep with FOLFOX/BEV was tolerable with an increased ORR, but PFS was inferior. Subgroup analysis of baseline variables including Kirsten rat sarcoma oncogene did not identify subgroups with PFS benefit. Decreased treatment intensity with standard agents likely contributed to the lack of benefit with pelareorep. Future studies might consider alternate pelareorep/chemotherapy strategies or combination therapy with novel agents.

Prognostic and predictive effects of TP53 co-mutation in patients with EGFR-mutated non-small cell lung cancer (NSCLC).

INTRODUCTION: TP53 mutations are common in non-small cell lung cancer (NSCLC) and have been reported as prognostic of poor outcome. The impact of TP53 co-mutations in epidermal growth factor receptor (EGFR)-mutated NSCLC is unclear. MATERIALS AND METHODS: Tissue from 105 patients with EGFR-mutated NSCLC at Princess Margaret Cancer Centre was analyzed by next-generation or Sanger sequencing to determine TP53 mutational status. Associations between TP53 status and baseline patient and tumor characteristics, treatments and outcomes (relapse-free survival [RFS] after surgical resection, overall survival [OS], overall response rate [ORR] and progression-free survival [PFS] on EGFR tyrosine kinase inhibitors [TKIs]), were investigated. RESULTS: Dual TP53/EGFR mutations were found in 43/105 patients (41%). Among 76 patients who underwent surgical resection, neither RFS (HR 0.99, CI 0.56-1.75, p=0.96) nor OS (HR 1.39, CI 0.70-2.77; p=0.35) was associated with TP53 status. Sixty patients (24 TP53 MUT; 36 TP53 WT) received first-generation EGFR TKIs for advanced disease. ORR was not significantly different (TP53 MUT 54%, WT 66%, p=0.42). There was a non-significant trend towards shorter PFS on EGFR TKIs with TP53 mutation (HR 1.74, CI 0.98-3.10, p=0.06). When limited to TP53 missense mutations (n=17), PFS was significantly shorter (HR 1.91, CI 1.01-3.60, p=0.04). Among 11 evaluable patients treated with T790M inhibitors, ORR was not significantly different (TP53 MUT 3/3 [100%], WT 7/8 [88%]). CONCLUSIONS: Patients with dual TP53/EGFR mutations, especially missense mutations, had marginally lower response rates and shorter PFS when treated with EGFR TKI therapy. Larger datasets are required to validate these observations.

Association of BRM promoter polymorphisms and esophageal adenocarcinoma outcome.

PURPOSE: Brahma (BRM) is a critical catalytic subunit of the SWI/SNF chromatin remodeling complex; expression of BRM is commonly lost in various cancer types. BRM promoter polymorphisms (BRM-741; BRM-1321) are associated with loss of BRM expression, and with cancer risk/survival. We evaluated these two polymorphisms in the overall survival (OS) of esophageal adenocarcinoma (EAC) patients. RESULTS: Of 270 patients, 37% were stage IV. Minor allele frequencies were 47-49%; 15% were double-homozygotes. When compared to the wild-type genotype, the homozygous variant of BRM-741 carried an adjusted OS hazard ratio (aHR) of 1.64 (95% CI:1.1-2.4); for BRM-1321, the aHR was 2.09 (95% CI:1.4-3.0). Compared to the double wild-type, carrying homozygous variants of both promoter polymorphisms (double-homozygote) yielded an aHR of 2.21 (95% CI:1.4-3.6). Directions/magnitudes of associations were similar in subsets by age, gender, smoking status, use of platinum agents, and disease stage, and for progression-free survival. MATERIALS AND METHODS: In a cohort of EAC patients of all stages (84% male; median age of 64 years), two BRM polymorphisms were genotyped. Cox proportional hazards models, adjusted for known prognostic variables, estimated the association of polymorphisms with OS. CONCLUSIONS: BRM polymorphisms were associated with OS in EAC in this study. Validation studies are warranted.

Treatment options for patients with brain metastases from EGFR/ALK-driven lung cancer.

INTRODUCTION: Brain metastases in EGFR/ALK-driven NSCLC frequently pose treatment dilemmas. Tyrosine kinase inhibitors (TKIs) can control extracranial disease, but radiotherapy is often required for intracranial control. We aimed to evaluate the impact of first-line whole brain radiotherapy (WBRT), stereotactic radiotherapy (SRS) or TKI alone on outcomes of patients with brain metastases from EGFR/ALK-driven NSCLC. METHODS: This single center retrospective review included 184 patients with brain metastases from EGFR/ALK-driven NSCLC, and analyzed effect of treatment choice on time to intracranial progression (TTIP) and overall survival (OS). RESULTS: First-line treatment for brain metastases consisted of WBRT in 120 patients, SRS in 37 and TKI alone in 27. WBRT-treated patients had more brain metastases, and more baseline symptoms. Median TTIP was longer in the WBRT group at 50.5months than SRS or TKI groups at 12 and 15months (p=0.0038). No significant difference was seen in median OS: 21.6months in the WBRT group, 23.9months in the SRS group and 22.6months in the TKI group (p=0.67). In multivariable analysis, age>65years (HR 2.2, p=0.0014), greater number of brain metastases (HR 2.48, p=0.0002) and greater number of extracranial metastatic sites (2 vs 0-1 HR=2.05, p=0.014 and 3+ vs 0-1 HR=2.95, p=0.0001 were associated with shorter OS. No independent effect was seen from first-line CNS treatment choice. CONCLUSIONS: First-line WBRT for brain metastases from EGFR/ALK-driven NSCLC was associated with longer TTIP than SRS or TKI alone, with no difference in OS. These results could support deferral of WBRT until intracranial progression in selected patients who are closely monitored.

ALK-Rearranged Non-Small-Cell Lung Cancer Is Associated With a High Rate of Venous Thromboembolism.

BACKGROUND: Patients with lung cancer are at increased risk for venous thromboembolism (VTE), particularly those receiving chemotherapy. It is estimated that 8% to 15% of patients with advanced non-small-cell lung cancer (NSCLC) experience a VTE in the course of their disease. The incidence in patients with specific molecular subtypes of NSCLC is unknown. We undertook this review to determine the incidence of VTE in patients with ALK (anaplastic lymphoma kinase)-rearranged NSCLC. PATIENTS AND METHODS: We identified all patients with ALK-rearranged NSCLC diagnosed and/or treated at the Princess Margaret Cancer Centre (PM CC) in Canada between July 2012 and January 2015. Retrospective data were extracted from electronic medical records. We then included a validation cohort comprising all consecutive patients with ALK-rearranged NSCLC treated in 2 tertiary centers in Israel. RESULTS: Within the PM CC cohort, of 55 patients with ALK-rearranged NSCLC, at a median follow-up of 22 months, 23 (42%) experienced VTE. Patients with VTE were more likely to be white (P = .006). The occurrence of VTE was associated with a trend toward worse prognosis (overall survival hazard ratio = 2.88, P = .059). Within the validation cohort (n = 43), the VTE rate was 28% at a median follow-up of 13 months. Combining the cohorts (n = 98), the VTE rate was 36%. Patients with VTE were younger (age 52 vs. 58 years, P = .04) and had a worse Eastern Cooperative Oncology Group performance status (P = .04). VTE was associated with shorter overall survival (hazard ratio = 5.71, P = .01). CONCLUSION: The rate of VTE in our ALK-rearranged cohort was 3- to 5-fold higher than previously reported for the general NSCLC population. This warrants confirmation in larger cohorts.

Biomarkers That Currently Affect Clinical Practice in Lung Cancer: EGFR, ALK, MET, ROS-1, and KRAS.

Lung cancer remains the most lethal malignancy in the world. Despite improvements in surgical treatment, systemic therapy, and radiotherapy, the 5-year survival rate for all patients diagnosed with lung cancer remains between 15 and 20%. Newer therapeutic strategies rely on specific molecular alterations, or biomarkers, that provide opportunities for a personalized approach to specific patient populations. Classification of lung cancer is becoming increasingly focused on these biomarkers, which renders the term "non-small cell lung" cancer less clinically useful. Non-small cell lung cancer is now recognized as a complex malignancy and its molecular and genomic diversity allows for patient-centered treatment options. Here, we review advances in targeted treatment of lung adenocarcinoma with respect to five clinically relevant biomarkers - EGFR, ALK, MET, ROS-1, and KRAS.