Efficacy and Safety of Pembrolizumab in Patients with RefractoryAdvanced Biliary Tract Cancer: Tumor Proportion Score as a PotentialBiomarker for Response / Journal of the Korean Cancer Association, 대한암학회지

Purpose@#The current standard chemotherapy for advanced biliary tract cancer (BTC) has limited benefit,and novel therapies need to be investigated. @*Materials and Methods@#In this prospective cohort study, programmed death ligand-1 (PD-L1)–positive BTC patientswho progressed on first-line gemcitabine plus cisplatin were enrolled. Pembrolizumab 200mg was administered intravenously every 3 weeks. @*Results@#Between May 2018 and February 2019, 40 patients were enrolled. Pembrolizumab wasgiven as second-line (47.5%) or  third-line therapy (52.5%). The objective response ratewas 10% and 12.5% by Response Evaluation Criteria in Solid Tumor (RECIST) v1.1 andimmune-modified RECIST (imRECIST) and median duration of response was 6.3 months.Among patients with progressive disease as best response, one patient (1/20, 5.0%)achieved complete response subsequently. The median progression-free survival (PFS) andoverall survival (OS) were 1.5 months (95% confidence interval [CI], 0.0 to 3.0) and 4.3months (95% CI, 3.5 to 5.1), respectively, and objective response per imRECIST was significantlyassociated with PFS (p < 0.001) and OS (p=0.001). Tumor proportion score  50%was significantly associated with higher response rates including the response after pseudoprogression(vs. < 50%; 37.5% vs. 6.5%; p=0.049). @*Conclusion@#Pembrolizumab showed modest anti-tumor activity in heavily pretreated PD-L1–positiveBTC patients. In patients who showed objective response, durable response could beachieved.

Contrast-Enhanced Endoscopic Ultrasound for Differentially Diagnosing Autoimmune Pancreatitis and Pancreatic Cancer

BACKGROUND/AIMS: Differentially diagnosing focal-type autoimmune pancreatitis (f-AIP) and pancreatic cancer (PC) is challenging. Contrast-enhanced harmonic endoscopic ultrasound (CEH-EUS) may provide information for differentiating pancreatic masses. In this study, we evaluated the usefulness of CEH-EUS in differentiating f-AIP from PC. METHODS: Data were collected prospectively and analyzed on patients who underwent CEH-EUS between May 2014 and May 2015. Eighty consecutive patients were diagnosed with f-AIP or PC. PC and f-AIP were compared for enhancement intensity, contrast agent distribution, and internal vasculature. RESULTS: The study group comprised 53 PC patients and 27 f-AIP patients (17 with type-1 AIP [15 definite and two probable], two with probable type-2 AIP, and eight with AIP, not otherwise specified). Hyper- to iso-enhancement in the arterial phase (f-AIP, 89% vs PC, 13%; p < 0.05), homogeneous contrast agent distribution (f-AIP, 81% vs PC, 17%; p < 0.05), and absent irregular internal vessels (f-AIP, 85% vs PC, 30%; p < 0.05) were observed more frequently in the f-AIP group. The combination of CEH-EUS and enhancement intensity, absent irregular internal vessels improved the specificity (94%) in differentiating f-AIP from PC. CONCLUSIONS: CEH-EUS may be a useful noninvasive modality for differentially diagnosing f-AIP and PC. Combined CEH-EUS findings could improve the specificity of CEH-EUS in differentiating f-AIP from PC.

A Case of Disseminated Mycobacterium intracellulare Infection in an Immunocompromised Host / 결핵및호흡기질환

We report a case of disseminated Mycobacterium intracellulare infection in a 31-year-old man who had been diagnosed as having dermatomyositis and systemic lupus erythematosus 3-years prior. The patient developed a left pleural effusion M. intracellulare was repeatedly isolated from the pleural fluid. After antimycobacterial treatment, the patient's pleural effusion resolved, but a left knee joint effusion developed newly and M. intracellulare was cultured from the joint fluid. At present, the patient has been taking antimycobacterial medication for 15 months but his left knee joint fluid remains positive for M. intracellulare. To our knowledge, this is the second reported case of disseminated NTM infection in a non-HIV infected patient in Korea.

A Case of Sarcoidosis with Pancytopenia as Resulting from Bone Marrow Involvement / 결핵및호흡기질환

Sarcoidosis is a granulomatous disease that can involve any organ, although it primarily involves the lungs, intrathoracic lymph nodes, skin, and eyes. We present a case of sarcoidosis with pancytopenia, resulting from bone marrow involvement. A 35-year-old man was admitted to hospital for chronic cough and blurred vision. On chest computed tomography, there were multiple pulmonary nodules and mediastinal lymph nodes enlargement. As the patient also showed pancytopenia, we performed a bone marrow biopsy, as well as a transbronchial lung biopsy. Both biopsies showed non-caseating granulomas. We diagnosed the patient with sarcoidosis with pulmonary, bone marrow, uvea, liver and spleen involvement. After oral steroid therapy, the patient's symptoms as well as his pancytopenia improved. We present this case to demonstrate the significance of bone marrow biopsy in cases of sarcoidosis with pancytopenia, as well the possibility of clinical improvement with steroid treatment.

A Case of Bronchoesophageal Fistula Mimicking Pulmonary Tuberculosis / 결핵및호흡기질환

Benign bronchoesophageal fistula is a rare disease and it may be characterized by nonspecific symptoms that can cause a delayed diagnosis. We misdiagnosed a patient with recurrent aspiration, which was due to bronchoesophageal fistula, as active pulmonary tuberculosis. The patient was 44 year old female who had suffered from chronic cough, especially during eating liquid meals, since 1982 when she had been treated for tuberculous lymphadenitis. Computed tomography showed an irregular mass with surrounding centrilobular nodules in the superior segment of the right lower lobe (RLL). She was diagnosed as having active pulmonary tuberculosis and treated with anti-tuberculosis medication, but she continued to complain of persistent cough even after anti-tuberculosis treatment. Thus, we reexamined the patient, and bronchoesophageal fistula between the esophagus and the superior segment of the RLL was finally confirmed by esophagography. After the fistula was surgically treated, the patient became asymptomatic and she then experienced good health.