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MINI 01 - Pathology (ID 93)
- Event: WCLC 2015
- Type: Mini Oral
- Track: Biology, Pathology, and Molecular Testing
- Presentations: 1
- Moderators:W.A. Franklin, A.G. Nicholson
- Coordinates: 9/07/2015, 10:45 - 12:15, Mile High Ballroom 2c-3c
MINI01.03 - Pathology-Imaging Agreement in Distinguishing Separate Primary Tumours and Intrapulmonary Metastasis in Staging of Multiple Lung Cancers (ID 2659)
10:45 - 12:15 | Author(s): A. Devaraj
The 7[th] TNM staging system for lung cancer recommended staging for cases with multiple nodules viewed as intrapulmonary metastases (IM) as T3 (same lobe), T4 (ipsilateral different lobe) and M1a (contralateral lobe), whilst those classified as separate primary tumours (SPTs) as T(x)NM where “x” is the number of primary tumours, either as a number or “m” for multiple. With an increase in patients presenting with multiple nodules, we sought to develop a set of criteria for c-staging on imaging and to determine the agreement between clinical and pathological staging in a cohort of resected lung cancers who had multiple nodules.
In 2013 and 2014, there were a total of 48 consecutive cases with available imaging resected with multiple tumours, ranging from 2 to 5 nodules. Of these, one case was excluded as it was a carcinoid with background DIPNECH. These cases were classified as SPT or IM based on previously published criteria (Girard et al. Am J Surg Pathol 2009;33:1752-64). Imaging criteria were generated based on clinical experience in similar fashion with indicators of SPT being 1) Lesions of equivalent size (one not more than 100% of the other) 2) Smaller lesion is spiculated , 3) At least one lesion is subsolid, 4) Presence of field change. (For signs 1 and 2, if the lesions were in different lungs, an absence of mediastinal disease on imaging was required). Cases with at least one positive sign were classified as SPTs. The interobserver agreement between radiologists and pathologist were then generated.
Of the 47 cases, the additional nodules were not identifiable on CT in 7 cases. In the remaining 40 cases, there was agreement in 28 cases, of which 16 were SPTs and 12 were IM. Of 12 cases where there was disagreement, only 3 were SPTS and the majority were cases classified on pathology as IM. There was 70% agreement, greater than that expected by chance (p = 0.002) with a kappa value of 0.41.
Moderate agreement can be achieved in terms of clinical and pathological staging of lung cancers presenting with multiple nodules using imaging and pathologic criteria. Using pathology as the gold standard, there was greater agreement in categorisation of SPTs (84% (16/19)) than IM (57% (12/21)).
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