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J.M. Isbell
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MA12 - Miscellaneous Biology/Pathology (ID 476)
- Event: WCLC 2016
- Type: Mini Oral Session
- Track: Biology/Pathology
- Presentations: 1
- Moderators:B. Dome, W.D. Travis
- Coordinates: 12/06/2016, 14:20 - 15:50, Schubert 1
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MA12.08 - Clinicopathological Significance of Increasing Percentage of High-Grade Histological Subtypes in Lung Adenocarcinomas (ID 6023)
14:20 - 15:50 | Author(s): J.M. Isbell
- Abstract
- Presentation
Background:
In early-stage lung adenocarcinomas, high-grade micropapillary (MIP) and solid (SOL) predominant pathology is known to be associated with worse prognosis. The aim of this study is, in addition to predominant patterns, to investigate clinical impact of the presence of small amounts (≥5%) as well as increasing percentage of high-grade patterns.
Methods:
Invasive tumors from early-stage lung adenocarcinoma patients who underwent curative-intent resection with no induction therapy were investigated (N=2017; 1995-2012) (8[th] edition TNM pStage I=1390, II=357, III=270). In 388 cases, synchronous lymph node (LN) metastases were available. Histological subtype (lepidic [LEP], acinar [ACI], papillary [PAP], MIP, or SOL) percentages were stratified into 4 groups; 0-4%, 5-24%, 25-49%, and 50-100%. The association between increasing percentage of patterns of primary tumor and the incidence of lymphatic/vascular invasion, necrosis, tumor spread through air spaces (STAS) as well as estimated 5-year cumulative incidence of recurrence (CIR) were analyzed. The differences in distribution of each pathological variable between 4 groups was analyzed by Chi-square test. The percentages of histological pattern were compared between primary tumor and LN metastasis.
Results:
Increasing percentage of MIP pattern is associated with increasing incidence of lymphatic/vascular invasion, STAS, as well as 5-year CIR (Figure 1a, p<0.001). Increasing percentage of SOL pattern is associated with increasing incidence of necrosis and 5-year CIR (p<0.001). Presence (≥5%) of SOL pattern is associated with higher incidence of lymphatic/vascular invasion and STAS (p<0.001) compared to the absence (<5%) of SOL pattern, but no significant relationship between lymphatic/vascular invasion and proportion of SOL pattern. The percentage of SOL pattern in LN metastasis is higher than that in synchronous primary tumors (Figure 1b).
Conclusion:
In early-stage lung adenocarcinomas, presence (≥5%) of MIP or SOL patterns as well as increasing percentages is associated with poor prognostic clinicopathological variables and incidence of recurrence. Figure 1
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OA01 - Risk Assessment and Follow up in Surgical Patients (ID 371)
- Event: WCLC 2016
- Type: Oral Session
- Track: Surgery
- Presentations: 1
- Moderators:W. Zhong, E. Lim
- Coordinates: 12/05/2016, 11:00 - 12:30, Schubert 2
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OA01.03 - Impact of Increasing Age on Cause-Specific Mortality and Morbidity in Stage I NSCLC Patients: A Competing Risk Analysis (ID 4952)
11:00 - 12:30 | Author(s): J.M. Isbell
- Abstract
- Presentation
Background:
At the time of diagnosis, two-thirds of patients with lung cancer are ≥65 years of age with significant comorbidities. We sought to determine the short- and long-term cancer- and noncancer-specific mortality and morbidity in patients who underwent resection for stage I non-small cell lung cancer (NSCLC).
Methods:
Of 5371 consecutive patients who had undergone curative-intent resection of primary lung cancer (2000–2011), 2186 patients with pStage I NSCLC were included in the analysis. All preoperative clinical variables known to affect outcomes were considered, including, Charlson comorbidity index, predicted postoperative (ppo) diffusion capacity of the lung for carbon monoxide (DLCO), and ppo–forced expiratory volume in 1 second (FEV1). Association between factors and cause-specific mortality was performed using competing risks approach.
Results:
Of 2186 patients, 1532 patients (70.1%) were ≥65 years of age, including 638 patients (29.2%) ≥75 years of age. In patients ≥65 years of age, for up to 2.5 years after resection, noncancer-specific CID was higher than lung cancer–specific CID, the higher noncancer-specific early-phase mortality was enhanced in patients ≥75 years of age compared with 65-74 years of age (Figure 1a). Multivariable analyses adjusted by age, sex, smoking status, comorbidities, tumor size, and surgical procedures showed that low ppoDLCO was an independent predictor for severe morbidity (p<0.001), 1-year mortality (p<0.001), and noncancer-specific mortality (p<0.001), whereas low ppoFEV1 for lung cancer–specific mortality (p=0.002). PpoDLCO can be used for estimation of 5-year cumulative incidence of noncancer death (Figure 1b, right, red curve) because of its linear relation, whereas ppoFEV1 for lung cancer-specific death (Figure 1b, left, black curve).
Conclusion:
In patients undergoing curative-intent resection of stage I NSCLC, noncancer-specific mortality is a significant competing event, with increasing impact as patient age increases. Figure 1
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