목적: 골육종에 대한 술전 항암화학요법의 효과를 조기에 비침습적으로 평가하기 위해 다양한 영상 진단 기법들을 사용해 왔다. 저자들은 골육종에 대한 술전 항암화학요법의 효과를 예측하는 데 있어 단순 촬영 및 양전자 방출 단층 촬영과 같은 영상 검사들의 효용성을 평가하고 양성자 방출 단층 촬영에서 얻어진 값들을 해석하는 데 있어서의 통칙을 정해 보고자 하였다. 대상 및 방법: 2주기 술전 항암화학요법 후 외과적 절제를 시행한 18명의 골육종 환자들을 대상으로 하였다. 남자 13명, 여자 5명이었으며, 연령의 중위수는 19세였다. 술전 항암화학요법의 전후로 단순 촬영 및 양전자 방출 단층 촬영을 시행하였다. 절제된 종양에 대해 병리검사를 시행하여 조직학적 반응 등급을 확인하였다. 조직병리학적 괴사 정도와 방사선학적 소견, 술전 항암화학요법 후 최대 표준섭취계수(maximum standardized uptake value), 평균 표준섭취계수(average standardized uptake value), 대사종양용적(metabolic tumor volume) 및 해당 값들의 감소율에 대해 통계학적 분석을 시행하였다. 결과: 조직학적 평가 상, 8명의 환자에서 술전 항암화학요법에 대해 좋은 반응을 확인하였다. 최대 표준섭취계수 감소율의 중위수는 좋은 반응을 보인 군에서 74 (23-77) %였고, 나머지에서 42 (-32-76) %였다. 대사종양용적 감소율의 중위수는 좋은 반응을 보인 군에서 93.5 (62-99) %였고 나머지에서 46 (-81-100) %였다. 방사선학적 소견의 범주는 조직학적 반응에 따른 차이가 없었지만 (p=1.0), 최대 표준섭취계수의 감소율은 유의한 차이를 보였다(p=0.041). 대사종양용적의 감소율 차이는 통계학적 유의성에 근접하였다(p=0.071). 결론: 본 연구에서 방사선학적 소견의 범주는 골육종에 대한 술전 항암화학요법의 효과를 평가하는 데 있어 신뢰할 수 없었지만, 최대 표준섭취계수는 유용한 척도였다. 양전자 방출 단층 촬영에서 얻어지는 값들은 여러 요인에 의해 영향을 받으므로, 각 기관은 기왕의 연구들을 참고로 각자의 판단 기준을 마련하기 위해 노력해야만 한다.
목적: 골육종에 대한 술전 항암화학요법의 효과를 조기에 비침습적으로 평가하기 위해 다양한 영상 진단 기법들을 사용해 왔다. 저자들은 골육종에 대한 술전 항암화학요법의 효과를 예측하는 데 있어 단순 촬영 및 양전자 방출 단층 촬영과 같은 영상 검사들의 효용성을 평가하고 양성자 방출 단층 촬영에서 얻어진 값들을 해석하는 데 있어서의 통칙을 정해 보고자 하였다. 대상 및 방법: 2주기 술전 항암화학요법 후 외과적 절제를 시행한 18명의 골육종 환자들을 대상으로 하였다. 남자 13명, 여자 5명이었으며, 연령의 중위수는 19세였다. 술전 항암화학요법의 전후로 단순 촬영 및 양전자 방출 단층 촬영을 시행하였다. 절제된 종양에 대해 병리검사를 시행하여 조직학적 반응 등급을 확인하였다. 조직병리학적 괴사 정도와 방사선학적 소견, 술전 항암화학요법 후 최대 표준섭취계수(maximum standardized uptake value), 평균 표준섭취계수(average standardized uptake value), 대사종양용적(metabolic tumor volume) 및 해당 값들의 감소율에 대해 통계학적 분석을 시행하였다. 결과: 조직학적 평가 상, 8명의 환자에서 술전 항암화학요법에 대해 좋은 반응을 확인하였다. 최대 표준섭취계수 감소율의 중위수는 좋은 반응을 보인 군에서 74 (23-77) %였고, 나머지에서 42 (-32-76) %였다. 대사종양용적 감소율의 중위수는 좋은 반응을 보인 군에서 93.5 (62-99) %였고 나머지에서 46 (-81-100) %였다. 방사선학적 소견의 범주는 조직학적 반응에 따른 차이가 없었지만 (p=1.0), 최대 표준섭취계수의 감소율은 유의한 차이를 보였다(p=0.041). 대사종양용적의 감소율 차이는 통계학적 유의성에 근접하였다(p=0.071). 결론: 본 연구에서 방사선학적 소견의 범주는 골육종에 대한 술전 항암화학요법의 효과를 평가하는 데 있어 신뢰할 수 없었지만, 최대 표준섭취계수는 유용한 척도였다. 양전자 방출 단층 촬영에서 얻어지는 값들은 여러 요인에 의해 영향을 받으므로, 각 기관은 기왕의 연구들을 참고로 각자의 판단 기준을 마련하기 위해 노력해야만 한다.
Purpose: Various diagnostic imaging modalities have been used to evaluate the effect of neoadjuvant chemotherapy for osteosarcoma early and noninvasively. We evaluated the effectiveness of imaging studies of plain radiographs and positron-emission tomography/computed tomography (PET/CT) in predictin...
Purpose: Various diagnostic imaging modalities have been used to evaluate the effect of neoadjuvant chemotherapy for osteosarcoma early and noninvasively. We evaluated the effectiveness of imaging studies of plain radiographs and positron-emission tomography/computed tomography (PET/CT) in predicting neoadjuvant chemotherapy effect for osteosarcoma and tried to establish a general principle in interpretation of PET/CT parameters. Materials and Methods: Eighteen patients who underwent two cycles of neoadjuvant chemotherapy and surgical excision for osteosarcoma were enrolled. There were 13 males and 5 females, with a median age of 19 (11-63) years. Fifteen patients of 18 had the American Joint Committe on Cancer (AJCC) stage IIB. They had plain radiographs and PET/CT before and after neoadjuvant chemotherapy. The resected tumor specimens were pathologically examined to determine histological response grade using a conventional mapping method. Statistical analysis was performed to evaluate the correlation between histopathological necrosis rate, and radiographic finding category, post-chemotherapy maximum standardized uptake value (SUVmax), average standardized uptake value and metabolic tumor volume (MTV) as well as reduction rates of them. Results: Eight patients were good responders to neoadjuvant chemotherapy based on histological evaluation. Median SUVmax reduction rate was 73 (23-77) % in good responders and 42 (-32-76) % in poor responders. Median MTV reduction rate was 93.5 (62-99) % in good responders and 46 (-81-100) % in poor responders. While radiographic finding category was not different according to histological response (p=1.0), SUVmax reduction rate was significantly different (p=0.041). Difference in MTV reduction rates approached statistical significance as well (p=0.071). Conclusion: While radiographic finding category was not reliable to assess neoadjuvant chemotherapy effect for osteosarcoma, reduction rate of SUVmax was a useful indicator in this study. As parameters of PET/CT can be influenced by various factors of settings, different centers have to make an effort to establish their own standard of judgement with reference of previous studies.
Purpose: Various diagnostic imaging modalities have been used to evaluate the effect of neoadjuvant chemotherapy for osteosarcoma early and noninvasively. We evaluated the effectiveness of imaging studies of plain radiographs and positron-emission tomography/computed tomography (PET/CT) in predicting neoadjuvant chemotherapy effect for osteosarcoma and tried to establish a general principle in interpretation of PET/CT parameters. Materials and Methods: Eighteen patients who underwent two cycles of neoadjuvant chemotherapy and surgical excision for osteosarcoma were enrolled. There were 13 males and 5 females, with a median age of 19 (11-63) years. Fifteen patients of 18 had the American Joint Committe on Cancer (AJCC) stage IIB. They had plain radiographs and PET/CT before and after neoadjuvant chemotherapy. The resected tumor specimens were pathologically examined to determine histological response grade using a conventional mapping method. Statistical analysis was performed to evaluate the correlation between histopathological necrosis rate, and radiographic finding category, post-chemotherapy maximum standardized uptake value (SUVmax), average standardized uptake value and metabolic tumor volume (MTV) as well as reduction rates of them. Results: Eight patients were good responders to neoadjuvant chemotherapy based on histological evaluation. Median SUVmax reduction rate was 73 (23-77) % in good responders and 42 (-32-76) % in poor responders. Median MTV reduction rate was 93.5 (62-99) % in good responders and 46 (-81-100) % in poor responders. While radiographic finding category was not different according to histological response (p=1.0), SUVmax reduction rate was significantly different (p=0.041). Difference in MTV reduction rates approached statistical significance as well (p=0.071). Conclusion: While radiographic finding category was not reliable to assess neoadjuvant chemotherapy effect for osteosarcoma, reduction rate of SUVmax was a useful indicator in this study. As parameters of PET/CT can be influenced by various factors of settings, different centers have to make an effort to establish their own standard of judgement with reference of previous studies.
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제안 방법
All 18F-FDG PET/CT images were reviewed at a workstation with fusion software (Syngo; Siemens Medical Solutions, Knoxville,Tenn.) that provided multiplanar reformatted images and displayed PET images with attenuation correction, CT images, and PET/CT fusion images. The images were closely reviewed for the detection of the primary tumor by one nuclear medicine physician who are board certified in both nuclear medicine and radiology.
All patients had undergone an open biopsy, pre-chemotherapy plain radiographs and a pre-chemotherapy PET/CT scan before neoadjuvant chemotherapy was initiated. Patients received consistently two cycles of neoadjuvant chemotherapy, which consisted of different combinations of high-dose methotrexate, doxorubicin, ifosfamide,and dacarbazine. Each cycle of neoadjuvant chemotherapy took at least three weeks.
They then had post-chemotherapy plain radiographs and a post-chemotherapy PET/CT scan before definitive surgery. The pre-chemotherapy PET/CT scans were performed within median one week (range, 0-2 weeks) before the initiation of neoadjuvant chemotherapy, and the post-chemotherapy PET/CT scans were performed within median one week (range, 0-2 weeks) after the end of chemotherapy. The resected tumor specimens were pathologically examined to estimate histological response grade using a conventional mapping method as described in previous literatures.
Each cycle of neoadjuvant chemotherapy took at least three weeks. They then had post-chemotherapy plain radiographs and a post-chemotherapy PET/CT scan before definitive surgery. The pre-chemotherapy PET/CT scans were performed within median one week (range, 0-2 weeks) before the initiation of neoadjuvant chemotherapy, and the post-chemotherapy PET/CT scans were performed within median one week (range, 0-2 weeks) after the end of chemotherapy.
대상 데이터
Figure 1. A 13 year-old male patient. While (D) a plain radiograph and (E) an magnetic resonance imaging (MRI) after chemotherapy show marked increase in tumor size compared to (A) a plain radiograph and (B) an MRI after chemotherapy, (F) a post-chemotherapy 18F-Fluoro-2-deoxyglucose(18F-FDG) positron-emission tomography/computed tomography (PET/CT) image damonstrated decrease in 18F-FDG uptake compared to (C) a prechemotherapy PET/CT image.
데이터처리
Statistical analysis was performed to evaluate correlation between histopathological necrosis, and radiographic finding category category, post-chemotherapy SUVmax, SUVavg and MTV as well as reduction rates of them, with SPSS 21.0 for Windows (SPSS Corporation, Chicago, IL). Fisher’s exact test and Mann-Whitney test were performed for radiographic finding category and post-chemothearpy SUVavg repectively.
이론/모형
PET scan followed immediately over the same body region. The CT data were used for attenuation correction, and images were reconstructed using a standard ordered-subset expectation maximization (OSEM) algorithm (two iterations, eight subsets). The axial spatial intrinsic resolution of the system was 4.
MTV was defined as the summed volume in cubic centimeters (cm3) including the primary tumor. The MTV was measured using a semi-automated contouring program on a Leonardo workstation (Siemens Medical Solutions, Knoxville, Tenn.), based on the tumor-to-background intensity ratio. In the measurement of targeted MTV, we set a fixed SUV cut-off value of 2.
성능/효과
While radiographic finding category was not reliable to assess neoadjuvant chemotherapy effect for osteosarcoma, reduction rate of SUVmax was a useful indicator in this study. As parameters of PET/CT can be influenced by various factors of settings, different centers need their own standard of judgement with reference of previous studies.
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