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O17 - Anatomical Pathology I (ID 128)
- Event: WCLC 2013
- Type: Oral Abstract Session
- Track: Pathology
- Presentations: 1
O17.02 - Clinicopathologic, radiologic, and molecular characteristics of completely resected mucinous adenocarcinomas in the lung: Implications for prognosis (ID 3316)
10:30 - 12:00 | Author(s): H.Y. Lee
The real prognosis of mucinous adenocarcinomas (MAs) diagnosed according to the current IASLC/ATS/ERS lung adenocarcinoma classiﬁcation is controversial, and in particular, the prognostic value of MA and the relationship among pathologic features, clinicoradiologic presentation, and response to surgical treatment are still unclear. Therefore, the aim of this single-institution retrospective study is to analyze the prognostic role of clinicopathologic and radiologic features in surgically resected MA in a homogenous population of Asian patients.
Analyzed variables are clinicoradiologic presentations, operation type, histologic subtypes, and stage. Univariate and multivariate analyses of survival were performed.
From 1994 through 2011, 161 resected lung carcinomas were diagnosed as MA in 158 patients, according to the IASLC/ATS/ERS classiﬁcation. 158 patients included 114 in 1 stage (72%), 29 in 2 (18%), and 15 in 3 (10%). 117 tumors (73%) were nodular-type and 44 (27%) were consolidation-type. Among 117 nodular MAs, 6 were pure GGO nodules.7 tumors presented as multiple lesions. 4 were AIS (lepidic pattern), 1 was MIA (acinar), and 156 (97%) were invasive adenocarcinoma (147 with acinar and 9 with cribriform pattern). The 5-year recurrence rate was 22%, and the 5-year survival rate was 88%. Five-year OS for patients with nodular type compared with those with consolidation-type was 89 versus 57 % (P < 0.001). Based on the multivariate Cox-proportional analysis, consolidation-type on CT (HR 1.42), cribriform pattern (HR 10.35), higher stage (HR 1.51), and higher SUVmax (HR 1.27) were significant poor prognostic predictor for DFS. As for recurrence, SUV max was the only significant predictor in both multivariate Cox-proportional analysis (HR 1.16, P = 0.016) and the log-rank test (cut-off 4.4, P = 0.045). Figure 1 Figure 2
Consolidation-type on CT, cribriform pattern, higher stage, and higher SUVmax would be predictive for lower overall survival. Also, SUVmax would be predictive for higher recurrence and may necessitate more aggressive adjuvant treatment.
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P1.21 - Poster Session 1 - Diagnosis and Staging (ID 169)
- Event: WCLC 2013
- Type: Poster Session
- Track: Prevention & Epidemiology
- Presentations: 1
- Coordinates: 10/28/2013, 09:30 - 16:30, Exhibit Hall, Ground Level
P1.21-009 - Reliability of transthoracic fine needle aspiration and core needle biopsy for the diagnosis of pulmonary mucinous adenocarcinoma (ID 2759)
09:30 - 16:30 | Author(s): H.Y. Lee
In case of mucinous adenocarcinoma (MA), cytologic atypia is usually mild to moderate and can be absent in some cases, creating a diagnostic pitfall in recognizing MA in small tissue biopsy and cytology specimens. Specific diagnosis of mucinous subtype in small tissue n FNA is important because it is considered an invasive neoplasm until proven otherwise, and it carries a worse prognosis for its aggressive behavior with frequent multicentricity and intrapulmonary metastatic spread. The purpose of this study was to evaluate the diagnostic accuracy of transthoracic fine needle aspiration (FNA) or core needle biopsy (CNB) of MA of the lung.
We retrospectively reviewed a consecutive series of 184 patients who underwent curative operation for MA. Among those patients, 105 patients underwent pre-operative percutaneous FNA (n= 34) or CNB (n= 79). Eight patients underwent both FNA and CNB for the same tumors. Diagnostic accuracies of FNA and CNB for MA were evaluated, and the contribution of various clinicopathologic parameters to subtyping accuracy was analyzed.
Diagnostic accuracies of FNA and CNB in determining malignancy were 67.6% and 87.3%, respectively. 20.6% and 59.5% were successfully diagnosed as MA through FNA and CNB, respectively. Univariate analysis implicated type of procedure and prominent growth pattern of mucinous adenocarcinoma as significant factors for successful pathologic diagnosis. Figure 1
CNB of diagnosis of MA is feasible and accurate. Our data support the suitability of small biopsy specimens for the new therapeutic paradigms even in mucinous adenocarcinoma.