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Tatsuya Kato
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OA 04 - Surgery from Minimal to Radical (ID 661)
- Event: WCLC 2017
- Type: Oral
- Track: Surgery
- Presentations: 1
- Moderators:J. Lee, A. Chang
- Coordinates: 10/16/2017, 15:45 - 17:30, Room 311 + 312
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OA 04.02 - Feasibility of Pulmonary Resection Following Definitive Chemoradiotherapy for Primary Lung Carcinoma (ID 9633)
15:45 - 17:30 | Author(s): Tatsuya Kato
- Abstract
- Presentation
Background:
Induction chemoradiation (ICR) for advanced non-small cell lung caner is often limited to 50Gy or less to avoid perioperative complications. Pulmonary resection following definitive chemoradiotherapy (DCR) has been an alternative approach for locally advanced lung cancer.
Method:
In this study, we compared pulmonary resection following ICR and DCR. From 1997 to 2016, we had 31 pulmonary resections following CR. There were 13 ICR and 18 DCR. Intercostal muscle flaps were used in 7 ICR and 2 DCR. Omental flaps were used in 12 DCR. Pericardial fat pad was used in 1 DCR．There was no mortality in any groups.
Result:
In comparison with ICR and HCR, operation time (min, interquartile range) were 344 (283-513) and 418 (563-572) (p = 0.057), estimated blood loss (ml) were 440 (225-575) and 525 (323-1313) (p =0,262), morbidity (%), 69 and 28 (p = 0.021). Bronchopleural fistula developed in one case of DCR who used intercostal muscle flap. Post operation hospital stay (days) was 21 (13.5-26.5) in ICR, 14.5 (13-20) in DCR (P = 0.221). Although operation time was longer and there were more blood loss in DCR, there was no significant increase of peri- and post-operative complications. 2- and 5-year over all survival rates (%) were 50 and 42 in ICR, and 68 and 51 in DCR (p=0.73, log-rank test).
Conclusion:
As a conclusion, high dose ICR may contribute to better local control and longer survival. Pulmonary resection after DCR is as safe as that following ICR.
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P1.12 - Pulmonology/Endoscopy (ID 698)
- Event: WCLC 2017
- Type: Poster Session with Presenters Present
- Track: Pulmonology/Endoscopy
- Presentations: 2
- Moderators:
- Coordinates: 10/16/2017, 09:30 - 16:00, Exhibit Hall (Hall B + C)
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P1.12-002 - Nanoparticle Targeted Folate Receptor 1 Enhanced Photodynamic Therapy for Lung Cancer (ID 8471)
09:30 - 16:00 | Presenting Author(s): Tatsuya Kato
- Abstract
Background:
Despite modest improvements, the prognosis of lung cancer patients has still remained poor and new treatment are urgently needed. Photodynamic therapy (PDT), the use of light-activated compunds (photosensitizers) is a treatment option but its use has been restricted to central airway lesions. Here, we report the use of novel porphyrin-lipid nanoparticles (porphysomes) targeted to folate receptor 1 (FOLR1) to enance the efficacy and specificity of PDT that may translate into a minimally-invasive intervention for peripheral lung cancer and metastatic lymph nodes of advanced lung cancer.
Method:
The frequency of FOLR1 expression in primary lung cancer and metastatic lymph nodes was first analyzed by human tissue samples from surgery and endobronchial ultrasonography-guided transbronchial needle aspiration (EBUS-TBNA). Confocal fluorescence microscopy was then used to confirm the cellular uptake and fluorescence activation in lung cancer cells, and the photocytotoxicity was evaluated using a cell viability assay. In vivo fluorescence activation and quantification of uptake were investigated in mouse lung orthotopic tumor models, followed by the evaluation of in vivo PDT efficacy.
Result:
FOLR1 was highly expressed in metastatic lymph node samples from patients with advanced lung cancer and was mainly expressed in lung adenocarcinomas in primary lung cancer. Expression of FOLR1 in lung cancer cell lines corresponded with the intracellular uptake of folate-porphysomes in vitro. When irradiated with a 671 nm laser at a dose of 10 J/cm2, folate-porphysomes showed marked therapeutic efficacy compared with untargeted porphysomes (28% vs. 83% and 24% vs. 99% cell viability in A549 and SBC5 lung cancer cells, respectively. Systemically-administered folate-porphysomes accumulated in lung tumors with significantly enhanced disease-to-normal tissue contrast. Folate-porphysomes mediated PDT successfully inhibited tumor cell proliferation and activated tumor cell apoptosis.
Conclusion:
Folate-porphysome based PDT shows promise in selectively ablating lung cancer based on FOLR1 expression in these preclinical models.
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P1.12-003 - Photothermal Ablation of Lung Cancer by Low Power Near-Infrared Laser and Topical Injection of Indocyanine Green; A Preliminary Animal Study (ID 8994)
09:30 - 16:00 | Author(s): Tatsuya Kato
- Abstract
Background:
Surgical resection by lobectomy with systematic lymph node dissection is the gold standard of treatment for early stage non-small cell lung cancer. However, minimally invasive tumor ablation can be an alternative treatment for patients not eligible for surgery due to comorbidities. The present study was designed to evaluate the efficacy of photothermal ablation therapy for lung cancer by low power near-infrared laser and topical injection of Indocyanine green (ICG).
Method:
6 New Zealand white rabbits were employed for the study. Tumor suspension containing VX2 cancer cells with growth factor reduced Matrigel was inoculated into the lung using an ultrathin bronchoscope. 3 rabbits were treated by laser ablation therapy with topical injection of ICG. Another 3 rabbits were treated by laser ablation alone. All tumors were irradiated with a laser with 500 mW output at 808 nm for 15 min. The tumors were examined histopathologically to assess the ablated areas.
Result:
Figure 1The maximum surface temperature of the tumor in rabbits treated by ICG/laser and laser alone were more than 58°C and less than 40°C, respectively. The ablated areas in the rabbits using ICG/laser were statistically larger than those in the rabbits using laser alone (ICG/laser: 0.49±0.27 cm[2] vs laser alone: 0.02±0.002 cm[2]) (p < 0.05).
Conclusion:
We clarified the efficacy of the photothermal treatment by low power near-infrared laser and topical injection of ICG using a rabbit VX2 orthotopic lung cancer model. This system may be able to be applied for transbronchial laser ablation of peripheral lung cancers.
