Yoshihiko Maehara

Fukuoka University, Hukuoka, Fukuoka, Japan

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Publications (806)2051.16 Total impact

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    ABSTRACT: We report a case of acute type B aortic dissection with the complication of bowel ischemia and abdominal stent graft compression treated by emergency thoracic aortic stent grafting after endovascular aneurysm repair (EVAR) for abdominal aortic aneurysm (AAA). A 69-year-old male was admitted to our hospital for sudden thoraco-abdominal pain. He had past treatment history of EVAR for AAA half a year ago. A computed tomography (CT) showed acute type B aortic dissection, and conservative treatment was initially performed. Three days after occurrence of aortic dissection, worsened abdominal pain and melena were observed. CT showed that the true lumen and abdominal stent graft was compressed by the false lumen. Emergency thoracic endovascular repair (TEVAR) was performed to close the entry tear. After the operation, the image views and the symptoms were improved. The state was still stable 6 months later. TEVAR for acute type B aortic dissection can become one of the effective treatments.
    12/2015; 1(1). DOI:10.1186/s40792-015-0096-3
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    ABSTRACT: Purpose: INPP4B is considered to function as a putative tumor suppressor through its inhibitory function of Akt. In various malignant tumors, loss of heterozygosity (LOH) at the chromosomal region containing INPP4B and lower expression of INPP4B has been reported. The purpose of this study was to examine the frequency of the INPP4B LOH and its association with the clinicopathological characteristics and prognosis in breast cancer of Japanese women. Methods: The allelic alteration at the INPP4B and PTEN gene loci was analyzed in 277 invasive primary breast carcinomas. The relationships between INPP4B LOH and the clinicopathological features were investigated. Results: Among the 238 informative cases for the evaluation, LOH at the INPP4B gene locus was observed in 43 tumors (18.1%). INPP4B LOH was significantly correlated with ER and PR negativity (p = 0.0009 and p = 0.0029, respectively), higher nuclear grade (p < 0.0001), higher Ki67 labeling index (p = 0.0006), triple-negative (TN) subtype (p = 0.0005) and PTEN LOH (p < 0.0001). INPP4B LOH was significantly associated with poorer prognosis, in terms of the relapse-free survival (RFS) and overall survival (OS). According to the multivariate analyses, INPP4B LOH was not independently associated with the prognosis. Conclusion: The incidence of INPP4B LOH was significantly higher in the TN subtype and positively correlated with PTEN LOH. INPP4B LOH was associated with more aggressive and proliferative phenotype. INPP4B LOH was also associated with poorer prognosis.
    Breast (Edinburgh, Scotland) 11/2015; DOI:10.1016/j.breast.2015.10.006 · 2.38 Impact Factor

  • Journal of the American College of Surgeons 11/2015; DOI:10.1016/j.jamcollsurg.2015.11.001 · 5.12 Impact Factor
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    ABSTRACT: Introduction: Living donor liver transplantation (LDLT) using ABO-incompatible (ABOi) graft for acute liver failure (ALF) is a developing treatment modality. Methods: We reviewed the changes in our treatment strategies in applying ABOi LDLT for FH over our fourteen years of experience. Results: Five patients with ALF received LDLT in adults using ABOi grafts, with different but gradually renewed protocols. The etiologies for acute liver failure included autoimmune hepatitis (n=3) and unknown (n=2). The desensitization protocol for ABOi barrier included Case #1; local infusion (portal vein)+plasma exchange (PE), Case #2; local infusion (hepatic artery)+rituximab+PE, Case #3 and #4; rituximab+PE, and Case #5; rituximab+PE under high-flow continuous hemodiafiltration. Local infusion was abandoned since Case #3, because Case #1 had portal vein thrombosis resulting in graft necrosis and Case #2 had hepatic artery dissection. The patients (Case #2 and #3), who received rituximab within 7 days before LDLT, experienced antibody-mediated rejection. Thus, the most recent protocol for ABOi-LDLT is that rituximab is given 2 weeks before LDLT, followed by high-flow continuous hemodiafiltration to obstacle hepatic encephalopathy until LDLT. The four patients except Case #1 are doing well with good graft function over 3.8±3.7 years. Conclusion: Rituximab-based ABOi-LDLT, most-recently under high-flow hemodiafiltration for treating encephalopathy, is a feasible option for applying LDLT for ALF. J. Med. Invest. 62: 184-187, August, 2015.
    The Journal of Medical Investigation 09/2015; 62(3.4):184-187. DOI:10.2152/jmi.62.184
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    ABSTRACT: Purpose: The aim of this study was to clarify the usefulness of two-stage operation for the patients with esophageal cancer who have liver dysfunction. Methods: Eight patients with esophageal cancer concomitant with liver dysfunction who underwent two-stage operation were analyzed. The patients initially underwent an esophagectomy, a cervical esophagostomy and a tube jejunostomy, and reconstruction with gastric tube was performed after the recovery of patients' condition. Results: The average time of the 1(st) and 2(nd) stage operation was 410.0 min and 438.9 min, respectively. The average amount of blood loss in the 1(st) and 2(nd) stage operation was 433.5 ml and 1556.8 ml, respectively. The average duration between the operations was 29.8 days. The antesternal route was selected for 5 patients (62.5%) and the retrosternal route was for 3 patients (37.5%). In the 1(st) stage operation, no postoperative complications were observed, while, complications developed in 5 (62.5%) patients, including 4 anastomotic leakages, after the 2(nd) stage operation. Pneumonia was not observed through two-stage operation. No in-hospital death was experienced. Conclusion: A two-stage operation might prevent the occurrence of critical postoperative complications for the patients with esophageal cancer concomitant with liver dysfunction. J. Med. Invest. 62: 149-153, August, 2015.
    The Journal of Medical Investigation 09/2015; 62(3.4):149-153. DOI:10.2152/jmi.62.149
  • Yo-Ichi Yamashita · Ken Shirabe · Shinichi Aishima · Yoshihiko Maehara ·
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    ABSTRACT: This chapter covers a range of important topics in the evaluation of the microvascular invasion (MVI) in hepatocellular carcinoma (HCC) before treatment. The malignant potential of HCC is reflected by the types of MVI such as portal venous (vp), hepatic vein (vv) or bile duct (b) infiltration. The identification of the type of MVI in HCC has a key role in decisions regarding the effective treatment of HCC. Here, we describe the possible and important predictors of MVI in HCC.
    Digestive Diseases 09/2015; 33(5):655-660. DOI:10.1159/000438475 · 2.18 Impact Factor
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    ABSTRACT: Our previous study showed that administering oxaliplatin as first-line chemotherapy increased ERCC1 and DPD levels in liver colorectal cancers (CRCs) metastases. Second, whether the anti-VEGF monoclonal antibody bevacizumab alters tumoral VEGFA levels is unknown. We conducted this multicenter observational study to validate our previous findings on ERCC1 and DPD, and clarify the response of VEGFA expression to bavacizumab administration. 346 CRC patients with liver metastases were enrolled at 22 Japanese institutes. Resected liver metastases were available for 175 patients previously treated with oxaliplatin-based chemotherapy (chemotherapy group) and 171 receiving no previous chemotherapy (non-chemotherapy group). ERCC1, DPYD, and VEGFA mRNA levels were measured by real-time RT-PCR. ERCC1 mRNA expression was significantly higher in the chemotherapy group than in the non-chemotherapy group (P = 0.033), and were significantly correlated (Spearman's correlation coefficient = 0.42; P < 0.0001). VEGFA expression level was higher in patients receiving bevacizumab (n = 51) than in those who did not (n = 251) (P = 0.007). This study confirmed that first-line oxaliplatin-based chemotherapy increases ERCC1 and DPYD expression levels, potentially enhancing chemosensitivity to subsequent therapy. We also found that bevacizumab induces VEGFA expression in tumor cells, suggesting a biologic rationale for extending bevacizumab treatment beyond first progression.
    Oncotarget 09/2015; DOI:10.18632/oncotarget.5227 · 6.36 Impact Factor
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    ABSTRACT: We herein describe a case involving spontaneous rerupture of a nonparasitic liver cyst successfully treated with cyst fenestration and an omental flap. A 59-year-old Japanese woman was transferred to our hospital for evaluation of acute abdominal pain. She had a history of conservative treatment with antibiotics for spontaneous rupture of a liver cyst 1 month previously. On arrival, she exhibited abdominal tenderness and muscular defense. Enhanced computed tomography showed ascites and a large ruptured hepatic cyst (diameter of 10 cm). We diagnosed rerupture of a liver cyst and performed laparotomy for cyst fenestration and intraperitoneal drainage. During the operation, we found the perforation site on the ventral side of the cyst and brown, muddled ascitic fluid. Cholangiography showed no bile leakage on the inner wall. Pathological investigation revealed no evidence of malignancy. The patient recovered without any adverse events and was discharged on postoperative day 8. No recurrences or complications occurred for 2 years.
    09/2015; 1(1):71. DOI:10.1186/s40792-015-0075-8
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    ABSTRACT: This study was designed to evaluate the efficacy and safety of XELOX plus bevacizumab in a Japanese metastatic colorectal cancer population that included elderly patients. This was a multicenter, single-arm, open-label prospective study. The major inclusion criteria were previously untreated metastatic colorectal cancer, presence of measurable lesions, age ≥20 years; Eastern Cooperative Oncology Group performance status of 0-2, and adequate organ function. Patients received bevacizumab (7.5 mg/kg on day 1) and XELOX (130 mg/m(2) oxaliplatin on day 1 plus 1,000 mg/m(2) capecitabine b.i.d. on days 1-14) every 3 weeks. The primary endpoint was confirmed objective response rate. The study included 47 patients (male/female 30/17; median age 69 years; age range 38-81 years with 10 patients ≥75 years; PS 0/1/2, 40/5/2) enrolled between May 2010 and March 2011. Responses were assessed in 46 eligible patients. The objective response rate was 52.2 % (95 % confidence interval [CI] 37.0-67.1). The median progression-free survival and overall survival were 10.0 months (95 % CI 7.8-12.3) and 34.6 months (95 % CI 19.9-not estimable), respectively. Frequently encountered grade 3 and 4 adverse events in this study were aspartate aminotransferase elevation (23.4 %), alanine aminotransferase elevation (21.3 %), anorexia (12.8 %), neutropenia (10.6 %), fatigue (8.5 %) and anemia (6.4 %). Grade 3 or 4 peripheral neuropathy was not observed. First-line treatment with XELOX plus bevacizumab showed a promising response rate and an acceptable tolerability profile in the clinical practice of Japanese metastatic colorectal cancer patients that included elderly patients. UMIN-CTR, ID number: UMIN000003915, URL:https://upload.umin.ac.jp/cgi-open-bin/ctr/ctr.cgi?function=brows&action=brows&type=summary&recptno=R000004706&language=E.
    International Journal of Clinical Oncology 09/2015; DOI:10.1007/s10147-015-0895-3 · 2.13 Impact Factor
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    ABSTRACT: The Kyushu Study Group of Clinical Cancer (KSCC) conducted phase II trials of KSCC1002 (UMIN000001308) concerning liver resectability after first-line treatment of initially unresectable or not optimally resectable colorectal liver metastases in a prospective, multicenter study. Patients with wild-type KRAS received 4-6 cycles of S-1 and oxaliplatin (SOX) plus cetuximab. Liver resectability was evaluated subsequently with the liver resection rate as the primary endpoint. Of the 33 patients enrolled between March 2010 and July 2013, the median number of administration cycles was 4 (range 0-10). The overall response rate was 63.6 % (95 % confidence interval [CI] 45.1-79.6 %). Liver resection was possible in 16 of 33 (48.5 %) patients, and there were 13 R0 cases (39.4 %). We conducted a central review of liver resectability evaluated by five liver surgeons, and the resectability increased from 18.2 to 66.7 % after chemotherapy, based on imaging. The median overall survival for all 33 cases was 31.6 months (95 % CI 14.8-not reached). The median progression-free survival was 9.7 months (95 % CI 6.2-11.8). SOX plus cetuximab is safe and effective for advanced colorectal cancer with limited liver metastasis, and may lead to high liver resectability.
    Annals of Surgical Oncology 09/2015; DOI:10.1245/s10434-015-4771-1 · 3.93 Impact Factor
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    ABSTRACT: CaseA 92-year-old woman was emergently admitted to our hospital for peritonitis caused by sigmoid colon cancer perforation, with a coexistent abdominal aortic aneurysm of 76 mm in diameter.OutcomeA 92-year-old woman was admitted to the hospital with a complaint of abdominal pain and fever of 24-h duration. On physical examination, severe tenderness with muscular defense and a palpable, pulsating mass were detected in the upper abdomen. The patient was diagnosed as having panperitonitis caused by sigmoid colon perforation. Computed tomography also revealed an infrarenal abdominal aortic aneurysm of 76 mm in diameter. We performed endovascular aneurysm repair to prevent aneurysmal rupture in the perioperative period and simultaneously performed intra-abdominal drainage and Hartmann's operation. The patient's postoperative course was uneventful.Conclusion Simultaneous endovascular aneurysm repair and operation for peritonitis is considered a possible treatment strategy for patients at high risk of abdominal aortic aneurysm rupture.
    09/2015; DOI:10.1002/ams2.134
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    ABSTRACT: Surgery for RGC can generally be difficult because of the severity of intra-abdominal adhesion due to past gastrectomy. Laparoscopic gastrectomy for RGC has been reported in some cases, but the adequacy of this procedure is still unclear. Herein we report four cases of RGC that underwent laparoscopic gastrectomy at our Hospital and discuss the benefit of the laparoscopic approach for RGC. Copyright© 2015 International Institute of Anticancer Research (Dr. John G. Delinassios), All rights reserved.
    Anticancer research 09/2015; 35(9):5023-6. · 1.83 Impact Factor
  • Yasue Kimura · Eiji Oki · Koji Ando · Hiroshi Saeki · Tetsuya Kusumoto · Yoshihiko Maehara ·
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    ABSTRACT: The occurrence of venous thromboembolism (VTE), manifesting as deep vein thrombosis or pulmonary embolism, after gastric and colorectal cancer surgery remains poorly characterized. The purpose of this study was to investigate the incidence of VTE following laparoscopic surgery in Japanese patients with gastric and colorectal cancer and identify the associated risk factors. We prospectively analyzed VTE events after laparoscopic surgery for gastric and colorectal cancer from April 2012 to March 2013 in our institute. Deep vein thrombosis was diagnosed with Doppler ultrasound sonography of the lower limb. Thromboprophylaxis, graduated compression stockings, and intermittent pneumatic compression were used in all patients. Fondaparinux sodium was used in several patients. We examined all patients' plasma D-dimer levels throughout the perioperative period. In total, 101 patients were enrolled in this study; 71 who underwent laparoscopic surgery for gastrointestinal cancer were finally analyzed. Thirteen patients (18.3 %) developed asymptomatic VTE. There were no relationships between the development of VTE and perioperative factors such as cardiovascular disease, operation time, blood loss, postoperative complications, and fondaparinux administration. Neoadjuvant treatment (chemotherapy or chemoradiotherapy) was significantly associated with VTE (p < 0.05). Plasma D-dimer levels were higher 7 days after surgery in patients with than without VTE, although the levels remained high after surgery in all patients. The incidence of VTE among Japanese patients who underwent laparoscopic surgery for gastrointestinal cancer was not low. In particular, clinicians should consider the higher risk of VTE in patients undergoing neoadjuvant therapy.
    World Journal of Surgery 08/2015; DOI:10.1007/s00268-015-3234-y · 2.64 Impact Factor
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    ABSTRACT: The incidence rate of esophagogastric junction (EGJ) adenocarcinoma has been rapidly increasing worldwide. Carcinoembryonic antigen (CEA) and carbohydrate antigen 19-9 (CA19-9) are major serum tumor markers in gastrointestinal cancers. However, the role of these markers in EGJ adenocarcinoma has not been thoroughly investigated. A total of 211 patients with EGJ adenocarcinoma who underwent surgery or endoscopic submucosal dissection at two academic institutions, Kumamoto University Hospital or Kyushu University Hospital between January 1996 and March 2014, were eligible for this study. Serum CEA and CA19-9 were examined within 1 month before resection. The cut-off values for CEA and CA19-9 were set at 5.0 ng/mL and 37 U/mL, respectively. The clinicopathological features and prognostic roles of the markers were examined using univariate and multivariate analyses. The positive ratios for preoperative CEA (>5.0 ng/mL) and CA19-9 (>37 U/mL) were 20.3% and 12.9%, respectively. The positive ratio of CEA and CA19-9 was significantly higher in patients with tumors invading muscular or deeper layers (P = 0.002 and <0.001, respectively). Cox proportional hazards model revealed that CA19-9 positivity, but not CEA positivity, was an independent prognostic factor in patients with EGJ adenocarcinoma for cancer-specific survival (multivariate hazard ratio [HR] = 3.89, 95% confidence interval [CI] 1.41-10.33; P = 0.010) and overall survival (multivariate HR = 2.43, 95% CI 1.03-5.35; P = 0.043). Preoperative serum CA19-9 is a useful prognostic marker in patients with EGJ adenocarcinoma. © 2015 The Authors. Cancer Medicine published by John Wiley & Sons Ltd.
    Cancer Medicine 08/2015; DOI:10.1002/cam4.514 · 2.50 Impact Factor
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    ABSTRACT: Hepatocellular carcinoma (HCC) is a poor-prognosis cancer due to its high rate of recurrence. microRNAs (miRNAs) are a class of small non-coding RNA molecules that affect crucial processes in cancer development. The objective of this study is to identify the role of miRNAs in patient bone marrow (BM) and explore the function of these molecules during HCC progression. We purified miRNAs from bone marrow cells of seven HCC patients, and divided them into three fractions by cell surface markers as follows: CD14(+) (macrophage), CD14(-)/CD45(+) (lymphocyte), and CD14(-)/CD45(-)/EpCAM(+) (epithelial cell). We employed microarray-based profiling to analyze miRNA expression in the bone marrow of patients with HCC. Differentially expressed miRNAs were significantly different between fractions from whole bone marrow, macrophages, and lymphocytes, and depended on stages in tumor progression. Differences in expression of miRNAs associated with cell proliferation also varied significantly between HCC patients with recurrence, multiple tumors, and advanced clinical stages. These results suggest that miRNA profiles in separated fractions of BM cells are associated with HCC progression.
    Journal of Clinical Medicine 08/2015; 4(8):1600-11. DOI:10.3390/jcm4081600

  • Journal of the American College of Surgeons 08/2015; DOI:10.1016/j.jamcollsurg.2015.08.005 · 5.12 Impact Factor
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    ABSTRACT: Communication is a serious problem for patients with ventilator-dependent tetraplegia. A 73-year-old man was presented at the emergency room in cardiopulmonary arrest after falling from a height of 2 m. After successful resuscitation, fractures of the cervical spine and cervical spinal cord injury were found. Due to paralysis of the respiratory muscles, a mechanical ventilator with a tracheostomy tube was required. First, a cuffed tracheostomy tube and a speaking tracheostomy tube were inserted, and humidified oxygen was introduced via the suction line. Using these tubes, the patient could produce speech sounds, but use was limited to 10 min due to discomfort. Second, a mouthstick stylus, fixed on a mouthpiece that fits over the maxillary teeth, was used. The patient used both a communication board and a touch screen device with this mouthstick stylus. The speaking tracheostomy tube and mouthstick stylus greatly improved his ability to communicate.
    08/2015; 2015(1). DOI:10.1155/2015/320357
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    ABSTRACT: The hallmark of primary biliary cirrhosis (PBC) is the presence of autoreactive T and B cell responses that target biliary epithelial cells (BEC). We have previously demonstrated that biliary cell cytotoxicity is dependent upon the initiation of innate immune responses followed by chronic adaptive as well as bystander mechanisms. Critical to these mechanisms are the interactions between natural killer (NK) cells and BEC. We have taken advantage of our ability to isolate relatively pure viable preparations of liver-derived NK cells, BEC, and endothelial cells, and studied the interactions between NK cells and BEC and focused on the mechanisms that activate autoreactive T cells, their dependence on IFN-γ, and the expression of BEC MHC class I and class II molecules. Importantly, we demonstrate herein that at a high NK/BEC ratio, NK cells are cytotoxic for autologous BECs, but are not dependent on autoantigen, but yet still activate autoreactive CD4(+) T cells in the presence of antigen presenting cells (APC). In contrast, at a low NK/BEC ratio, BECs are not lysed, but IFN-γ production is induced, which facilitates expression of MHC class I and class II molecules on BEC and, interestingly, protects them from lysis upon subsequent exposure to autoreactive NK cells. Furthermore, IFN-γ secreted from NK cells after exposure to autologous BECs is essential for this protective function and enables autoreactive CD4(+) T cells to become cytopathic. In conclusion, our data reveal that NK cell mediated innate immune responses are likely critical at the initial stage of PBC, but also facilitate and maintain the chronic cytopathic effect of autoantigen-specific T cells, essential for progression of disease. This article is protected by copyright. All rights reserved. © 2015 by the American Association for the Study of Liver Diseases.
    Hepatology 08/2015; DOI:10.1002/hep.28122 · 11.06 Impact Factor
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    ABSTRACT: The necessity of surgical treatment of liver metastases of gastric cancer is still controversial. We conducted a multicenter retrospective cohort study of liver-limited metastasis of gastric cancer treated surgically between 2000 and 2010. In this study, 103 patients were registered, with nine patients excluded from the analysis as they did not meet the eligibility criteria. Of the 94 patients, 69 underwent surgical resection, 11 underwent surgical resection combined with radiofrequency ablation or microwave coagulation therapy for small or deep tumors, and 14 underwent radiofrequency ablation or microwave coagulation therapy only. Synchronous and metachronous metastases were found in 37 and 57 patients, respectively. The 3- and 5-year overall survival rates of all the patients were 51.4 and 42.3 %, respectively. The 3- and 5-year relapse-free survival rates were 29.2 and 27.7 %, respectively. No significant difference in prognosis was observed between the patients who underwent surgical resection and those who underwent ablation therapy. The patients with hepatic solitary lesions and low-grade lymph node metastases of primary gastric cancer had significantly better overall survival and relapse-free survival. To our knowledge, this study is the largest series and first multicenter cohort study of liver-limited metastasis of gastric cancer. The study indicated that patients with a single liver metastasis with a grade lower than N2 lymph node metastasis of the primary lesion are the best candidates for liver resection.
    Gastric Cancer 08/2015; DOI:10.1007/s10120-015-0530-z · 3.72 Impact Factor

Publication Stats

9k Citations
2,051.16 Total Impact Points


  • 1992-2015
    • Fukuoka University
      • Faculty of Medicine
      Hukuoka, Fukuoka, Japan
  • 1985-2015
    • Kyushu University
      • • Department of Surgery and Science
      • • Division of Surgery
      • • Kyushu University Dental Hospital
      • • Medical Institute of Bioregulation - MIB Hospital
      Hukuoka, Fukuoka, Japan
  • 2014
    • Kumamoto University
      • Graduate School of Medical Sciences
      Kumamoto, Kumamoto, Japan
  • 2008-2014
    • National Hospital Organization Beppu Medical Center
      Бэппу, Ōita, Japan
    • The University of Tokushima
      • Department of Surgery
      Tokusima, Tokushima, Japan
    • National Cancer Center, Japan
      Edo, Tōkyō, Japan
  • 2012-2013
    • Kokura Memorial Hospital
      Kitakyūshū, Fukuoka, Japan
    • NHO Nagasaki Medical Center
      Nagasaki, Nagasaki, Japan
  • 2009
    • IIzuka Hospital
      Иидзука, Fukuoka, Japan
  • 2004
    • Fukushima Red Cross Hospital
      Hukusima, Fukushima, Japan
  • 2002-2003
    • National Hospital Organization Kyushu Cancer Center
      Hukuoka, Fukuoka, Japan
    • Saga-Ken Medical Centre Koseikan
      Kanzaki, Saga, Japan
  • 1998
    • Fukuoka City Hospital Organization
      Hukuoka, Fukuoka, Japan
  • 1996-1997
    • Dana-Farber Cancer Institute
      • Department of Radiation Oncology
      Boston, Massachusetts, United States