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G. Drpa
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P1.07 - Poster Session with Presenters Present (ID 459)
- Event: WCLC 2016
- Type: Poster Presenters Present
- Track: SCLC/Neuroendocrine Tumors
- Presentations: 1
- Moderators:
- Coordinates: 12/05/2016, 14:30 - 15:45, Hall B (Poster Area)
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P1.07-051 - Incidence and Clinical Characteristics of Pulmonary Large-Cell Neuroendocrine Carcinoma: An Overview of Our Own Data (ID 6188)
14:30 - 14:30 | Author(s): G. Drpa
- Abstract
Background:
Pulmonary neuroendocrine tumors are a heterogenous group of neoplasms. They are clasified into four histological types: typical carcinoid, atypical carcinoid, small-cell lung cancer (SCLC) and large-cell neuroendocrine carcinoma (LCNEC). They represent about 20% of all lung cancers. The most frequent one is small-cell lung cancer with incidence about 15%. In contrast, large-cell neuroendocrine carcinoma is an orphan disease with estimated incidence between 2.1% and 3.5%. Because of many diagnostic difficulties, LCNEC is considered to be of a higher frequency. It is lung neuroendocrine tumor, but it is also a type of non small-cell lung cancer (NSCLC). So its features overlap with both of these groups. However, the clinical behavior of LCNEC is very similar to SCLC and so new term high-grade neuroendocrine carcinoma (HGNEC) is in use.
Methods:
We retrospectively analysed patients diagnosed with cancer at our department between January 1, 2012 and December 31, 2014, with special focus on pulmonary neuroendocrine tumors. We examined incidence of different histologic types of pulmonary neuroendocrine tumors and sorted out patients with diagnosis of large-cell neuroendocrine carcinoma. We also analysed clinical characteristics of patients with LCNEC.
Results:
During the three-years period 1242 pulmonary patients were admitted to our department. Among them there were 726 newely diagnosed cancer patients. Various types of lung cancer were found in 652 patients. There were 104 patients with pulmonary neuroendocrine tumors, what makes about 16%. Thirteen of them (2%) were „pure“ LCNEC , 16 (2,5%) mixed LCNEC with small-cell component, 68 SCLC (10%), 4 atypical carcinoid, 2 typical carcinoid and 1 typical carcinoid in patient with adenocarcinoma. Generally in our patients high-grade neuroendocrine tumors make about 15%, and low-grade neuroendocrine tumors (carcinoides) make only 1% of all lung cancers. Most patients diagnosed with LCNEC were men over 50 years, heavy smokers, which is consistent with published data, but one patient was a 40-year-old woman.
Conclusion:
Pulmonary neuroendocrine tumors are group of neoplasms classified into four categories based on their patohistology. Three of them (carcinoides and LCNEC) are rare tumors. LCNEC is type of neuroendocrine tumor with most diagnostic and therapeutic difficulties. Clinical features of our patients are similar to previously published, while incidence is slightly lower.
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P2.03b - Poster Session with Presenters Present (ID 465)
- Event: WCLC 2016
- Type: Poster Presenters Present
- Track: Advanced NSCLC
- Presentations: 1
- Moderators:
- Coordinates: 12/06/2016, 14:30 - 15:45, Hall B (Poster Area)
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P2.03b-009 - Brain Metastasis and Epidermal Growth Factor Receptor Mutations in Croatian Caucasians with Lung Adenocarcinoma (ID 5182)
14:30 - 14:30 | Author(s): G. Drpa
- Abstract
Background:
The brain is a common site of metastasis in non-small cell lung cancer (NSCLC). The aim of this study was two-fold: 1) to determine the incidence of brain metastasis (BM) in Caucasian lung adenocarcinoma patients with epidermal growth factor receptor (EGFR) mutations and 2) to evaluate the frequencies and potential relationship of the different EGFR mutations with BM.
Methods:
A retrospective cohort study was conducted at a Croatian tertiary hospital (Clinic for Respiratory Diseases “Jordanovac”) using data collected from medical records. Caucasian patients with primary NSCLC who were tested for EGFR mutation status between January 2014 and October 2015 were included.
Results:
Of 1040 NSCLC samples tested, 122 (11.7%) patients with lung adenocarcinoma harboured EGFR mutations; six EGFR positive (+) patients (four with BM) had repeat EGFR testing. The majority of EGFR mutants were females (n= 90, 77.6%), non-smokers (including never-smokers and former-smokers; n= 95, 92.2%), diagnosed with advanced disease (stage IIIB/IV) at first presentation (n= 75, 68.8%), and median age at initial diagnosis of primary lung cancer was 65 years (35 - 90). Twenty-three (19.8%) of 116 EGFR+ patients were diagnosed with BM; for six EGFR+ patients, data about BM was missing. Most were 64 years of age or younger (n= 15, 65.2%) at diagnosis of BM (median age: 62 years, 48 - 72). Synchronous BM disease at initial diagnosis of lung cancer was found in 43.5% of EGFR+ patients with BM (n= 10). There were more EGFR+ women with BM (n= 20, 87%) than men. Single exon 19 deletion and exon 21 L858R mutations were the most common subtypes in both EGFR+ patients without BM (n= 44, 47.3% and n= 27, 27.8%, respectively) and with BM (n= 13, 56.5% and n= 5, 21.7%, respectively). One BM patient (4.3%) had a double mutation (exon 19 and 21), while six non-BM patients (6.2%) had simultaneous pairings, most commonly between exon 19 and 20 (n=3, 3.1%). Although exon 18 mutations were seen in six patients without BM (6.2%), none were found in BM+EGFR+ patients. Exon 20 T790M mutation occurred in 17.4% of BM patients (n= 4) versus 15.3% of non-BM patients (n= 15). Rare EGFR double mutations (exon 18 and 20) were found in two non-BM patients (2.2%).
Conclusion:
Larger long-term prospective studies to explore and confirm these results in BM+EGFR+ patients are warranted. In the era of precision oncology, molecular testing of EGFR mutations may further clarify the pathogenesis of lung cancer-associated BM.
