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Kamada T, Ishiguro H, Okada S, Takeuchi H, Takahashi J, Nakashima K, Nakaseko Y, Suzuki N, Ohdaira H, Suzuki Y. Pembrolizumab plus platinum-based chemotherapy for unfavorable cancer of unknown primary site: Case report. Ann Med Surg (Lond) 2020; 60:31-35. [PMID: 33101670 PMCID: PMC7578551 DOI: 10.1016/j.amsu.2020.10.024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2020] [Accepted: 10/10/2020] [Indexed: 11/24/2022] Open
Abstract
Introduction We report a case of sustained complete response in unfavorable cancer of unknown primary site (CUP) successfully treated with chemotherapy combining pembrolizumab, pemetrexed and platinum. Case presentation A 66-year-old man was presented with weight loss and cough for 3 months. Contrast-enhanced computed tomography (CT) confirmed a mass in the superior anterior mediastinum and multiple enlarged mediastinal and axillary lymph nodes. Positron emission tomography-CT (PET-CT) showed abnormal uptake in the corresponding lesions. Histopathological analysis of the left axillary nodule revealed poorly differentiated adenocarcinoma. Immunohistochemistry showed the tumor cells were positive for cytokeratin 7 and thyroid transcription factor-1 and negative for cytokeratin 20. Thus, the patient was diagnosed as poorly differentiated adenocarcinoma of unknown primary, and treated as non-small-cell lung cancer. Additional genetic testing revealed the patient was negative for EGFR, ALK fluorescence in situ hybridization, ROS1, BRAF, and PD-L1 22C3 IHC with Tumor Proportion Score (TPS) was less than 1%. The patient received six cycles of pembrolizumab, platinum, and pemetrexed intravenously. Cisplatin was switched to carboplatin because of cisplatin nephrotoxicity in one course. PET-CT after six cycles showed all lesions disappeared; complete response was considered to have been achieved. Maintenance therapy of pembrolizumab and pemetrexed has been continued for 6 months after the induction therapies to prevent progressive disease. Complete response has been maintained. Discussion Chemotherapy with pembrolizumab, platinum and pemetrexed could be valuable for treating unfavorable CUP. Conclusion Chemotherapy with pembrolizumab, platinum, and pemetrexed helped achieved sustained complete response in a patient with unfavorable CUP.
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Key Words
- ALK, anaplastic lymphoma kinase
- CEA, carcinoembryonic antigen
- CK7, cytokeratin 7
- CR, complete response
- CT, computed tomography
- CUP, cancer of unknown primary site
- Cancer of unknown primary
- EGFR, epidermal growth factor receptor
- LDH, lactate dehydrogenase
- NCCN, National Comprehensive Cancer Network
- Non-small-cell lung cancer
- PD-L1, programmed death ligand 1
- PET, positron emission tomography
- Pembrolizumab
- Pemetrexed
- Platinum
- TTF-1, thyroid transcription factor-1
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Affiliation(s)
- Teppei Kamada
- Department of Surgery, International University of Health and Welfare Hospital, 537-3, Iguchi, Nasushiobara, Tochigi, 329-2763, Japan
| | - Hiroshi Ishiguro
- Department of Oncology, International University of Health and Welfare Narita Hospital, 852, Hatakeda, Narita, Chiba, 286-0124, Japan
| | - Shinya Okada
- Department of Pathology, International University of Health and Welfare Hospital, 537-3, Iguchi, Nasushiobara, Tochigi, 329-2763, Japan
| | - Hideyuki Takeuchi
- Department of Surgery, International University of Health and Welfare Hospital, 537-3, Iguchi, Nasushiobara, Tochigi, 329-2763, Japan
| | - Junji Takahashi
- Department of Surgery, International University of Health and Welfare Hospital, 537-3, Iguchi, Nasushiobara, Tochigi, 329-2763, Japan
| | - Keigo Nakashima
- Department of Surgery, International University of Health and Welfare Hospital, 537-3, Iguchi, Nasushiobara, Tochigi, 329-2763, Japan
| | - Yuichi Nakaseko
- Department of Surgery, International University of Health and Welfare Hospital, 537-3, Iguchi, Nasushiobara, Tochigi, 329-2763, Japan
| | - Norihiko Suzuki
- Department of Surgery, International University of Health and Welfare Hospital, 537-3, Iguchi, Nasushiobara, Tochigi, 329-2763, Japan
| | - Hironori Ohdaira
- Department of Surgery, International University of Health and Welfare Hospital, 537-3, Iguchi, Nasushiobara, Tochigi, 329-2763, Japan
| | - Yutaka Suzuki
- Department of Surgery, International University of Health and Welfare Hospital, 537-3, Iguchi, Nasushiobara, Tochigi, 329-2763, Japan
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