Annual Meeting Proceedings Part 1 - American Society of Clinical ...
Annual Meeting Proceedings Part 1 - American Society of Clinical ...
Annual Meeting Proceedings Part 1 - American Society of Clinical ...
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Lung Cancer—Non-small Cell Local-Regional/Small Cell/Other Thoracic Cancers<br />
7056 General Poster Session (Board #36G), Sat, 1:15 PM-5:15 PM<br />
Prognostic value <strong>of</strong> MAGE-A3 and PRAME gene expression in non-smallcell<br />
lung cancer (NSCLC). Presenting Author: Albert Linder, Lungenklinik<br />
Hemer, Hemer Nordrhein-Westfalen, Germany<br />
Background: We investigated the expression <strong>of</strong> some cancer–testis genes<br />
and their association with disease prognosis. Here we report our results for<br />
the expression, in resected NSCLC samples, <strong>of</strong> two tumor-specific antigens<br />
(Ags): MAGE-A3 and PRAME, both under evaluation in clinical trials.<br />
Methods: We conducted a single-center, uncontrolled, retrospective study<br />
<strong>of</strong> tissue from resected stage I–III NSCLC patients (pts): 650 were in stage<br />
I, 215 in stage II and 395 in stage III. 1260 FFPE tumor tissue samples<br />
from the tumor tissue bank <strong>of</strong> the Department <strong>of</strong> Pathology, Lungenklinik<br />
Hemer (Germany), were tested for MAGE-A3 and PRAME expression by<br />
specific qRT-PCR assays. The prognostic value <strong>of</strong> these Ags was determined<br />
by estimating the median overall survival (OS), disease-free interval<br />
(DFI) and disease-free survival (DFS). Results: Expression rates were 36%<br />
for MAGE-A3 and 66% for PRAME. The co-expression rate was 30%.<br />
Almost all tumors expressing MAGE-A3 also expressed PRAME. We<br />
observed no difference overall in Ag expression according to stage, tumor<br />
size and pts’ age. Squamous tumors expressed MAGE-A3 and PRAME more<br />
frequently than did adenocarcinomas (43 vs. 27 % and 80 vs. 44%<br />
respectively), and PRAME expression rates were higher in males than in<br />
females (70 vs. 53%). In the overall population, which included stages<br />
IA–IIIB, no prognostic value was detected for the expression <strong>of</strong> either Ag. In<br />
subset analyses, we found in 83 stage IIIB pts a trend to worse OS linked to<br />
MAGE-A3 expression (HR�1.977, p�0.0312). In 395 stage IB pts,<br />
PRAME expression was associated with worse OS (HR�1.483, p�0.0344)<br />
and DFS (HR�1.492, p�0.0167). Conclusions: The MAGE-A3 expression<br />
rate found is consistent with the results observed in the phase III MAGRIT<br />
trial (J-H Kim et al., 2011). No prognostic value for either PRAME or<br />
MAGE-A3 was observed in the overall population, in contrast to previous<br />
reports with smaller sample sizes (Gure et al., 2005, Boli et al., 2002) and<br />
in other tumors (Vourch’jourdain et al., 2009, Epping et al., 2008). We<br />
observed a trend toward poor prognostic value <strong>of</strong> MAGE-A3 in stage IIIB pts<br />
and <strong>of</strong> PRAME in stage IB pts.<br />
7058 General Poster Session (Board #37A), Sat, 1:15 PM-5:15 PM<br />
Prognostic role <strong>of</strong> FOXP3/CD4 ratio in resectable NSCLC. Presenting<br />
Author: Marta Usó, Fundación para la Investigación del Hospital General<br />
Universitario de Valencia, Valencia, Spain<br />
Background: Tregs play a critical role in immune tolerance to tumor cells<br />
and have been related to prognosis. The aim <strong>of</strong> this study was to determine<br />
the expression <strong>of</strong> Tregs makers genes by RT-PCR and to correlate them with<br />
clinico-pathological and prognostic variables in NSCLC. Methods: RNA was<br />
isolated from frozen lung specimens (tumor and normal lung) from<br />
resectable NSCLC patients (n�175). RT-PCR was performed to analyze the<br />
expression <strong>of</strong>: CD4, CD8A, CTLA-4, FoxP3, IL-10, CD25, CD127 and<br />
TGF�-1. Relative expression was normalized by an endogenous gene<br />
(GUSB) using the Pfaffl formulae. Statistical analyses were considered<br />
significant at p�0.05. Results: Tumor samples had significantly lower<br />
expression <strong>of</strong> CD127 (x0.45) and a tendency toward higher expression <strong>of</strong><br />
CD25 (x1.81), FoxP3 (x1.57) and CTLA-4 (x1.53) compared to normal<br />
lung tissues, reflecting a Treg phenotype infiltrating the tumor. Survival<br />
analyses revealed that patients with higher FoxP3 expression had reduced<br />
OS (median 29.8 vs 67 months, p� 0.026). We also found that those<br />
patients with high levels FoxP3/CD4 ratio had worse TTP and OS (median<br />
22.1 months vs NR, p� 0.021 and 29.8 vs NR months, p�0.003,<br />
respectively). A multivariable Cox regression model for TTP and OS was<br />
built using variables that were found significant in the univariate analysis<br />
(nodal involvement, histology, tumor size, PS, and FoxP3/CD4 ratio). This<br />
analysis revealed that FoxP3/CD4 ratio was an independent prognostic<br />
marker for both TTP and OS (see table). Conclusions: FoxP3 is a transcription<br />
factor necessary and sufficient for induction <strong>of</strong> the immunosuppressive<br />
functions in Tregs. In concordance, our results indicate that higher levels <strong>of</strong><br />
FoxP3/CD4 ratio in tumor samples is a poor prognostic markers for TTP and<br />
OS. Furthermore, the multivariable COX regression analysis showed that<br />
FoxP3/CD4 ratio is an independent prognostic marker. Therefore, this ratio<br />
could be used as a new biomarker <strong>of</strong> prognosis in resectable NSCLC.<br />
Supported by grants PS09-01149 and RD06/0020/1024 from ISCIII.<br />
TTP OS<br />
HR 95% IC P HR 95% IC P<br />
Histology 1.14 1.01-1.29 .027* - - -<br />
Nodal involvement 1.38 1.06-1.81 .016* 1.34 1.00-1.80 .045*<br />
Tumor size 2.505 1.449-4.330 .001* 2.030 1.173-3.512 .011*<br />
FoxP3/CD4 ratio 2.11 1.24-3.63 .006* 2.42 1.38-4.24 .002*<br />
465s<br />
7057 General Poster Session (Board #36H), Sat, 1:15 PM-5:15 PM<br />
Prognostic value <strong>of</strong> pathologic complete response to preoperative chemotherapy<br />
in early-stage non small cell lung cancer: Combined analysis <strong>of</strong> two<br />
IFCT randomized trials. Presenting Author: Guillaume Mouillet, University<br />
Hospital, Besançon, France<br />
Background: Our study aimed to evaluate whether pathologic complete<br />
response (pCR) in early-stage non-small cell lung cancer (NSCLC) following<br />
neoadjuvant chemotherapy resulted in improved outcome and to determine<br />
predictive factors for pCR. Methods: Eligible patients with stage IB or II<br />
NSCLC were included in two consecutive Intergroupe Francophone de<br />
Cancérologie Thoracique (IFCT) phase III trials evaluating platinum-based<br />
neoadjuvant chemotherapy, with pCR defined by the absence <strong>of</strong> viable<br />
cancer cells in the resected surgical specimen. Results: Among the 492<br />
patients analyzed, 41 (8.3%) achieved pCR. In the pCR group, 5-year<br />
overall survival (OS) was 80.0% compared to 55.8% in the non-pCR group<br />
(p�0.0007). In multivariate analyses, pCR was a favorable prognostic<br />
factor <strong>of</strong> OS (RR�0.34; 95% CI�0.18-0.64) in addition to squamous cell<br />
carcinoma (SCC), weight loss �5%, and stage IB disease. Five-year<br />
disease-free survival (DFS) was 80.1% in the pCR group compared to<br />
44.8% in the non-pCR group (p�0.0001). Two patients (4.9%) in the pCR<br />
group experienced disease recurrence compared to 193 patients (42.8%)<br />
in the non-pCR group. SCC subtype was the only independent predictor <strong>of</strong><br />
pCR (OR�4.30; 95% CI�1.90-9.72). Conclusions: Our results showed<br />
that pCR after preoperative chemotherapy was a favorable prognostic factor<br />
in Stage IB-II NSCLC. Our study is the largest published series evaluating<br />
pCRs following preoperative chemotherapy. The only factor predictive <strong>of</strong><br />
pCR was SCC. Identifying molecular predictive markers for pCR may help in<br />
distinguishing patients likely to benefit from neoadjuvant chemotherapy<br />
and in choosing the most adequate preoperative chemotherapy regimen.<br />
7059 General Poster Session (Board #37B), Sat, 1:15 PM-5:15 PM<br />
A systematic analysis <strong>of</strong> high-dose radiation in the treatment <strong>of</strong> surgically<br />
unresectable, locally advanced non-small cell lung cancer. Presenting<br />
Author: Madhusmita Behera, Department <strong>of</strong> Hematology and Medical<br />
Oncology, Emory University School <strong>of</strong> Medicine, Atlanta, GA<br />
Background: The 5-year survival rate for locally advanced non-small cell<br />
lung cancer (NSCLC) is � 25% with concomitant chemoradiotherapy.<br />
High-dose radiation appears to confer additional benefit based on surrogate<br />
endpoints from relatively small clinical trials. However, survival advantage<br />
<strong>of</strong> higher-dose radiation delivered by conventional fractionation <strong>of</strong> 1.8-2 Gy<br />
is unclear. We conducted a systematic review <strong>of</strong> pooled outcome data from<br />
published results <strong>of</strong> studies that evaluated the role <strong>of</strong> high-dose radiation in<br />
the management <strong>of</strong> locally advanced NSCLC. Methods: A detailed search <strong>of</strong><br />
published clinical trials was conducted using computerized databases<br />
(MEDLINE, EMBASE, Cochrane library) and meeting proceedings. Single<br />
arm studies using high dose (�66Gy) or randomized trials <strong>of</strong> high versus<br />
standard radiation dose (60-63Gy) for locally advanced NSCLC were<br />
selected. A systematic analysis <strong>of</strong> extracted data was performed using<br />
Comprehensive Meta Analysis (Version 2.2.048) s<strong>of</strong>tware under the random<br />
effect model. <strong>Clinical</strong> outcome in patients treated with high versus<br />
standard radiation dose was compared using point estimates for weighted<br />
values <strong>of</strong> median overall survival (OS), progression free survival (PFS), and<br />
response rate (RR). Treatment-related toxicities data between the two arms<br />
was compared using T-test and chi-square test. Results: Analytic data was<br />
retrieved from the results <strong>of</strong> 44 eligible studies reported between 1994 and<br />
2012. The studies enrolled 3699 patients, 62% males, 2095 and 1604<br />
treated with standard and high dose radiation respectively. The weighted<br />
median age was 63 and 61 years (p�0.66) for standard and high dose<br />
patients respectively. The weighted median OS was 19.1 vs. 16.4 months<br />
(p� 0.97); weighted RR <strong>of</strong> 76% vs. 70% (p�0.79) and survival rates after<br />
up to 3 years <strong>of</strong> follow up <strong>of</strong> 39% vs. 46% (p�0.45) for standard and high<br />
dose arms respectively. There was no significant difference in the rate <strong>of</strong><br />
grade �3 toxicities between the two treatment groups. Conclusions:<br />
High-dose radiation therapy does not result in improved survival over<br />
standard radiotherapy dose in patients with locally advanced NSCLC.<br />
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