veristrat as predictor of benefit of first line non small cell lung cancer (nsclc) patients from standard chemotherapy

Conditions: Non Small Cell Lung Cancer

Summary: veristrat® is a pretreatment blood-based test correlated with clinical outcome after egfr-tki therapy in non-small cell lung cancer (nsclc) patients. the investigators hypothesis is that veristrat could be also employed as a biomarker of benefit from treatment with standard chemotherapy regimens in first line nsclc patients.

veristrat®, a pretreatment blood-based test correlated with clinical outcome after egfr-tki therapy in non-small cell lung cancer (nsclc) patients, was developed and validated in a multi-institutional study of advanced nsclc patients treated with gefitinib \[taguchi et al\] . the veristrat algorithm was developed using a training set of pre-treatment serum samples from patients who then experienced either long term stable disease or early progression on gefitinib therapy. mass spectra from these patients' serum samples were used to define eight ms features (i.e. peaks), differentiating these two outcome groups. an algorithm (veristrat) utilizing these features and based on a k-nearest neighbors (knn) classification scheme was created and its parameters were optimized using additional spectra from the training cohort. all aspects of veristrat were frozen after development. veristrat assigns each spectrum a "good" or "poor" label. veristrat was validated in a blinded fashion on two independent cohorts of patients who were treated with gefitinib or erlotinib. these studies confirmed that patients classified as "good" had better outcome than patients classified as "poor" (hr of death = 0.47 p = 0.0094 in one cohort, hr of death = 0.33 p = 0.0007 in the other). in the original study, veristrat was shown to correlate with clinical outcome following egfr-tki therapy, but not in the chemotherapy or post-surgery setting: no statistically significant difference was seen in the overall survival of patients classified as "good" or "poor" from the serum from patients collected before second-line chemotherapy (hr = 0.74, 95%, p = 0.42 in one cohort (cohort b) and hr = 0.81, p = 0.54 in another (cohort c)). in a third control cohort of patients with resected early-stage nsclc, the hazard ratio for overall survival was 0.90 (p = 0.79). however, further analysis of the subsets of chemotherapy samples demonstrated that separation between "good" and "poor" arms may depend on a particular type of chemotherapy. thus a retrospective subset analysis of the cohort c showed that while patients treated with docetaxel in second line did not show any sign of separation, patients receiving a combination of platinum-based agents with either vinorelbine or gemcitabine or paclitaxel had a trend to separation between the two arms. the working hypothesis for the mechanism is that the veristrat "poor" label is related to the activation of canonical and non-canonical mapk pathways downstream from receptor tyrosine kinases, with possible cross-talk activation of the nf-kb pathway. this means that veristrat may demonstrate different predictive performance depending on the particular chemotherapy treatment and its associated with cell pathway interactions.

Eligibility criteria:
inclusion criteria: * histologically or cytologically documented inoperable, locally advanced (stage iiib with supraclavicular lymph node metastases),metastatic (stage iv) or recurrent nsclc * age ≥18 years * life expectancy more than 3 months * ecog performance status 0-1 * at least one unidimensionally measurable lesion (as per recist criteria ver 1.1) * adequate baseline bone marrow, hepatic and renal function * patients may have had prior therapy providing the following conditions are met: radiation therapy: wash-out period of 28 days; surgery: wash-out period of 14 days * patients must give written informed consent to participate in the study exclusion criteria: * prior chemotherapy or treatment with another systemic anti-cancer agent (for example tyrosine kinase inhibitor). * patients must not receive any other investigational agents while on study * patients with myocardial infarction within the last six (6) months, unstable angina, new york heart association (nyha) grade ii or greater congestive heart failure, or serious cardiac arrhythmia requiring medication * history or evidence upon physical examination of cns disease unless adequately treated (e.g., any brain metastasis, seizure not controlled with standard medical therapy, or history of stroke). * patients with active or uncontrolled systemic disease/infections or with serious illness or medical conditions, which is incompatible with the protocol * any psychological, familial, sociological or geographical condition potentially hampering compliance with the study protocol * pregnancy or lactation. patients - both males and females - with reproductive potential (i.e. menopausal for less than 1-year and not surgically sterilized) must practice effective contraceptive measures throughout the study. women of childbearing potential must provide a negative pregnancy test (serum or urine) within 14 days prior to registration

Keywords: nsclc veristrat chemotherapy circulating tumor cells