The Eighth Edition Lung Cancer Stage Classification
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...Importantly, the eighth edition lung cancer stage classification involves also the evaluation of carcinoma in situ and of minimally invasive carcinoma [9]....
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...Finally, in the tumor evolution analysis, four driver genes had a significantly lower fraction of subclonal mutations, including TP53, KEAP1, STK11 and EGFR, thus suggesting a tumor initiation role for these genes [9]....
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...More importantly, the RFS and OS of patients with ADC larger than 2 to 3 cm with STAS were similar to those of patients with stage IB ADC.17 Thus, patients with ADC larger than 2 to 3 cm with STAS might benefit from postoperative chemotherapy.18,19 However, future studies with large and well-characterized cohorts are warranted to validate this hypothesis....
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...More importantly, the RFS and OS of patients with ADC larger than 2 to 3 cm with STAS were similar to those of patients with stage IB ADC.(17) Thus, patients with ADC larger than 2 to 3 cm with STAS might benefit from postoperative chemotherapy....
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...Furthermore, comparable RFS (p ¼ 0.091) and OS (p ¼ 0.443) rates were observed in patients with ADCs 3 cm or smaller with STAS present and those with stage IB ADC....
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...However, the 5-year postoperative recurrence rate reaches 30%.1,2 Tumor spread through air spaces (STAS) was listed as an additional invasive pattern of lung ADC in the WHO guidelines.3,4 STAS is defined as single cells, micropapillary clusters, or solid nests that are observed within air spaces in the surrounding lung parenchyma beyond the edge of the tumor.5 Recently, several studies demonstrated clearly that STAS offers another convincing explanation for postoperative recurrence of ADC.5–10 Although much effort has been made in searching for biomarkers that can aid in predicting the prognosis of patients with ADC, tumor size is an irreplaceable prognostic factor because of the significant difference in survival outcome observed with each centimeter of increase in tumor size.11 Aside from estimating prognosis, tumor size also contributes to treatment decisions (postoperative chemotherapy) and serves as a common language when enrolling patients in clinical trials (lobectomy versus limited resection).12,13 However, the effects that the combination of STAS and tumor size have on survival have not yet been well studied....
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...Specifically, STAS occurred less frequently in lepidic predominant ADC and more frequently in micropapillary and solid predominant ADC....
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References
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"The Eighth Edition Lung Cancer Stag..." refers background or methods in this paper
...The impact of size was analyzed using a running log rank statistic (initially in a p-stage N0 M0 R0 non-small cell lung cancer [NSCLC] cohort, but then substantiated in multiple others).(7) This confirmed previous size cutpoints and suggested further cutpoints in 1-cm increments....
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...The T component analysis was on the basis of 10,230 c-stage and 22,257 p-stage tumors with sufficient detailed information.(7) The impact of size was analyzed using a running log rank statistic (initially in a p-stage N0 M0 R0 non-small cell lung cancer [NSCLC] cohort, but then substantiated in multiple others)....
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...The T component is divided into five T categories that are defined by various T descriptors, as summarized in Table 3.(7) Size plays a prominent role in defining the T...
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...Tumors with one vs more than one positive descriptor within a T category were considered, but this was not incorporated into the classification because of inconsistent differences.(6,7)...
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