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Chinese Journal of Thoracic Surgery(Electronic Edition) ›› 2024, Vol. 11 ›› Issue (01): 40-52. doi: 10.3877/cma.j.issn.2095-8773.2024.01.05

• Original Article • Previous Articles    

Validation study of the proposals for coding T categories for part-solid nodules in the 8th edition TNM classification of lung cancer

Leilei Shen1, You Liu2, Haoyong Ning2, Tianyang Yun1, Xiaoming Hou3, Juntang Guo4, Chaoyang Liang4, Yang Liu4,()   

  1. 1. Department of Thoracic Surgery, Hainan Hospital of People’s Liberation Army General Hospital, Sanya 572000, China
    2. Department of Pathology, Hainan Hospital of People’s Liberation Army General Hospital, Sanya 572000, China
    3. Department of Radiology, People’s Liberation Army General Hospital, Beijing 100853, China
    4. Department of Thoracic Surgery, People’s Liberation Army General Hospital, Beijing 100853, China
  • Received:2023-11-07 Revised:2023-12-12 Accepted:2024-02-05 Online:2024-02-28 Published:2024-03-26
  • Contact: Yang Liu

Abstract:

Objective

In the 8th edition of TNM staging manual, clinical T invasive [cT (i) ] and pathological T invasive [pT (i) ] were proposed as clinical and pathological staging sizes in lung adenocarcinoma manifesting as part-solid nodules. There is no large-sample validation study of the T staging scheme of subsolid nodules in lung cancer population in China. This study aims to verify the clinical application values of the above proposed regimen.

Methods

Patients with part-solid nodules who underwent radical lung cancer resection in our hospital from January 2013 to December 2021 were retrospectively enrolled according to the clinical T total [cT (t) ], pathological T total [pT (t) ], cT (i), and pT (i). The disease-free survival (DFS) was estimated by the Kaplan-Meier method and compared by the log-rank test. Spearman rank correlation was used to analyze the correlation of different T staging manuals, and the predictive value of the four T staging systems on prognosis was compared by DeLong test.

Results

A total of 624 patients with subsolid nodules were enrolled in this study, all of which were adenocarcinoma with an average cT (t) of (26.40±9.76) mm, cT (i) of (18.29±9.77) mm, pT (t) of (20.35± 8.19) mm, and pT (i) of (14.76±9.71 mm. After restaged according to pT (i), 187 (30%) patients were downstaged from the previous stages to pIA1 (i), and there was a statistically significant difference in DFS between patients who were downstaged or not in pTIB (t) (P=0.03, HR=0.18, 95%CI: 0.04~0.89). After restaged according to cT (i), 152 (24.4%) were downstaged from the previous stages to cIA1 (i), and there was no significant difference in DFS between the downstage and same stage patients. The median follow-up was 43 months (7 to 116 months). In the prognostic assessment of DFS, pT (i) had the best prognostic value with a C index of 0.644, and cT (i) had the worst prognostic value with a C index of 0.591. Spearman rank correlation analysis showed moderate-power correlation between pT (i) and cT (i) (R=0.529, P<0.001) .

Conclusions

In patients with part-solid nodules, the pT (i) is more predictive of disease-free survival than the pT (t). There is a moderate-power correlation between the cT (i) and the pT (i), but its predictive prognostic value is relatively low.

Key words: Part-solid nodule, T stage, Pathological invasive component, Adenocarcinoma, Validation

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