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MA 15 - Lung Cancer Biology II (ID 670)
- Event: WCLC 2017
- Type: Mini Oral
- Track: Biology/Pathology
- Presentations: 1
MA 15.09 - Circumferential Distribution and Distance from Main Tumor of Tumor Spread Through Air Spaces (STAS) Are Prognostic (ID 10143)
15:45 - 17:30 | Author(s): R. Gaber
The prognostic impact of the presence of tumor spread through air spaces (STAS) has been reported in lung adenocarcinoma (ADC). The aim of this study is to investigate the prognostic impact of the distribution, distance from the primary tumor, and quantification of STAS.
A cohort of 394 patients with pathologic stage I lung ADC (2012-2014) were investigated. The distribution of STAS around the tumor was classified into focal or circumferential. The distance of STAS was evaluated by counting the number of air spaces between the farthest STAS and the tumor edge. STAS was quantified by counting the number of STAS areas in the three most STAS- dense 20x high power fields (HPFs). The recurrence free probability (RFP) was analyzed by the Kaplan-Meier method with a log-rank test.
STAS was present in 211 (54%) cases. The presence of STAS was associated with a higher risk of recurrence (5-y RFP in STAS-positive vs. STAS-negative; 78% vs 90%, p<0.001, Fig 1A). Circumferential STAS was associated with a higher risk of recurrence than focal STAS (5-y RFP in circumferential vs. focal; 67% vs 87%, p=0.027, Fig 1B). A longer distance of STAS was associated with a higher risk of recurrence (5-y RFP >7 alveoli vs.≤7 alveoli, 69% vs. 91%, p=0.003, Fig 1C). Quantification of STAS was not prognostic (5-y RFP in >3/HPFs vs. ≤3/HPFs, 75% vs. 88 %, p=0.15). Figure 1 X
Beyond just the presence of STAS, the distribution and distance of STAS can further stratify the risk of recurrence in stage I lung ADC.
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