99Tcm-HL91乏氧显像评价小鼠移植瘤放疗疗效

目的为^99Tc^m-4，9-二氮-3，3，10，10-四甲基十二烷-2，11-二酮肟（HL91）乏氧显像评价肿瘤放疗疗效提供依据。方法15只H22肝癌细胞小鼠移植瘤模型分成3组，每组各5只。A组不进行放疗；B组单次放疗25Gy后即刻进行^99Tc^m-HL91显像；C组单次放疗25Gy48h后进行^99Tc^m-HL91显像，计算B、C组放疗前后同一感兴趣区（ROI）内肿瘤组织与正常脑组织放射性计数比值（T／N）；测定A、B、C组凋亡细胞、G1期和S期细胞比例及观察肿瘤组织放疗前后病理变化。结果（1）B组放疗后T／N值较放疗前显著增高（P〈0．05）；C组放疗后T／N值较放疗前显著降低（P〈0．05）。（2）A、B、C组凋亡细胞之间比例差异具有统计学意义（P〈0．05，A〈B〈C）。（3）C组S期细胞所占比例明显低于A、B组，G1期细胞比例明显高于A、B组（P〈0．05）；C组肿瘤组织光学显微镜下可见凋亡细胞和大量细胞碎片。结论^99Tc^m-HL91显像是一种有价值的评价放疗疗效的手段。     

99Tcm-HL91显像评价鼻咽癌放疗前原发灶乏氧状况

目的 观察鼻咽癌放疗前原发灶的乏氧状况,分析放疗前各临床因素与原发灶乏氧的关系.方法 69例初治鼻咽癌患者,疗前利用99Tcm4,9-二氮-3,3,10,10-四甲基十二烷.2,11-二酮肟(HLg1)对原发灶进行乏氧显像.采用目测定性分析判定乏氧显像阳性病例;再利用感兴趣区(ROI)技术对阳性病例进行半定量分析,计算鼻咽病灶内放射性浓聚部位(T)与正常鼻咽组织(N)的放射性比值;根据目测分析结果和T/N的均数将原发灶乏氧程度分为阴性、轻度及重度乏氧;分析疗前各临床因素与乏氧程度的关系.采用SPSS 10.0软件对数据进行统计学处理.结果 63例(91.3%)患者乏氧显像阳性.患者不同年龄(＜45岁和≥45岁)、性别、病理分型(WHO Ⅲ型和Ⅲ型)和疗前Hb水平(＜130 g/L和≥130 g/L)的原发灶乏氧程度差异均无统计学意义(χ2值分别为-0.864,-0.881,-0.293,-0.514,P均＞0.05);不同原发灶体积(＜40 cm3和≥40 am3)之间及不同T分期(T1+T2,T3+T4)之间乏氧程度差异有统计学意义(χ2值分别为-4.672和-3.322,P值分别为0.000和0.001);在乏氧显像阳性病例中,原发灶体积与乏氧程度呈正相关(r=0.648,P＜0.01).结论 大多数初治鼻咽癌患者原发灶存在不同程度的乏氧;原发灶体积较大及T晚期患者的乏氧程度较体积小、T早期患者严重;乏氧程度有随原发灶体积增大而逐渐加重的趋势.     

99Tcm-HL91乏氧显像对甲状腺肿瘤的初步临床研究

目的探讨99Tcm-HL91甲状腺肿瘤阳性显像的可行性,分析其诊断效能。方法对6例正常自愿者与70例经甲状腺扫描证实的甲状腺孤立冷结节患者进行99Tcm-HL91显像研究,用肉眼法与半定量分析法对诊断效能予以评价。结果(1)99Tcm-HL91在正常人甲状腺内几乎不摄取,4 h颈部占全身放射性约1.18%;(2)甲状腺99Tcm-HL91乏氧显像结果有4种类型,即热、温、冷结节与不显影,热结节主要见于甲状腺癌;(3)甲状腺癌T/N比值随时间有升高趋势,4 h显示了较好的显像品质;(4)肉眼与半定量法(阈值)判断对甲状腺癌诊断的灵敏度,特异性和准确性分别为77.78%、92.31%、88.57%;88.89%、92.31%、91.42%(T/N比值≥1.08)。2种判断方法之间比较无显著性差异(P>0.05)。结论(1)99Tcm-HL91甲状腺乏氧显像能够鉴别甲状腺孤立冷结节的性质,肉眼法与半定量分析法对甲状腺肿瘤具有相同的诊断效能。(2)推荐用4 h恶性组T/N比值的x-s为诊断阈值,对于进一步判断甲状腺肿瘤性质有重要临床价值。     

乏氧显像剂及乏氧显像的临床应用

肿瘤组织乏氧是恶性肿瘤的一个重要生物学特征,肿瘤中乏氧细胞存在于实体瘤中是常见现象。乏氧显像是检测肿瘤乏氧的非创伤的方法,本文简要介绍了乏氧显像剂研究现状及其在肿瘤放疗中的应用。     

非小细胞肺癌放疗中99Tcm-HL91 SPECT乏氧显像研究

目的通过99Tcm-4,9-二氮-3,3,10,10-四甲基十二烷-2,11-二酮肟(HL91)系列乏氧显像研究非小细胞肺癌放疗前、中和后乏氧的变化.方法拟接受三维适形放疗的非小细胞肺癌患者20例,放疗前1～2 d、放疗过程中(接受30～40 Gy照射)和放疗后1～2 d分别行99Tcm-HL91 SPECT显像.利用感兴趣区(ROI)技术计算肿瘤/对侧相应部位放射性计数比值(T/N),分析放疗不同时期肿瘤乏氧的变化.结果放疗前、中和后显像的T/N(4 h)分别为1.56±0.19,1.40±0.12和1.29±0.13,差异有显著性(P=0.01).结论该实验为研究人体肿瘤再氧合提供了有价值的信息.     

99Tcm-HL91乏氧显像在鼻咽癌治疗中的应用

目的探讨99Tcm-4,9-二氮-3,3,10,10-四甲基十二烷-2,11-二酮肟(HL91)SPECT/CT乏氧断层显像在鼻咽癌(NPC)治疗中的临床应用价值.方法38例NPC患者按常规进行鼻咽、颈部99Tcm-HL91断层显像;并对病灶的靶/非靶组织放射性比值(T/N)进行半定量分析;其中16例NPC患者在放疗前、后均行99Tcm-HL91乏氧显像;同时对16例患者按乏氧靶区调整放疗剂量,行后程三维适形放疗(3DCRT).结果NPC患者乏氧断层显像检查阳性率约为82%;99Tcm-HL91乏氧显像对NPC诊断的灵敏度、特异性、准确性分别为82%、78%、87%;放疗前鼻咽、颈部乏氧病灶的T/N分别为2.37±1.13、2.17±1.08,两者比较差异无显著性(P＞0.05).16例NPC患者在放疗前、后NPC病灶的T/N平均值分别为2.21±1.05、1.29±0.39,两者比较差异有显著性(P＜0.001);NPC病灶的乏氧状态与其对放疗的响应密切相关,相关系数r为0.532,P＜0.01.NPC 3DCRT的近期疗效优于常规放疗,肿瘤局部控制率较高,急性放射毒性较轻.结论99Tcm-HL91乏氧显像可监测NPC病灶的乏氧状态,指导NPC的3DCRT;NPC乏氧靶区3DCRT可提高其放疗疗效,减轻急性放射毒性.     

99Tcm-HL91乏氧显像预测局部晚期非小细胞肺癌放疗敏感性

目的 探讨99Tcm-4,9-二氮-3,3,10,10-四甲基十二烷-2,11-二酮肟(HL91)乏氧显像预测局部晚期非小细胞肺癌(locally advanced non-small cell lung cancer,LANSCLC)对放疗敏感性的临床价值.方法 对29例LANSCLC患者静脉注射99Tcm-HL91 1110MBq 后进行1 h(早期)及4 h(延迟)SPECT断层显像,根据显像进行目测和半定量分析(T/N值),并按延迟显像T/N值将患者分为低摄取组及高摄取组.所有患者均接受常规分割放射治疗, 对2组放疗近期疗效进行比较.结果 99Tcm -HL91早期和延迟显像对LANSCLC患者乏氧诊断的灵敏度分别为75.9%(22/29)、100%(29/29),二者相比有显著差异(P=0.010).半定量分析结果T/N值与不同病理类型、临床分期、病灶大小无明显关系(P＞0.05).低摄取组(T/N＜2.15,n=17)放疗近期有效率76.5%(13/17)高于高摄取组(T/N≥2.15,n=12)的33.3%(4/12),比较有显著性差异(P=0.029).结论 99Tcm -HL91显像对LANSCLC乏氧诊断具有较高的灵敏度,并在预测其放疗近期效果方面具有一定的临床价值.     

用99Tcm-HL91显像预测脑肿瘤放疗敏感性

目的应用99Tcm-4,9-二氮-3,3,10,10-四甲基十二烷-2,11-二酮肟(HL91)乏氧显像预测脑肿瘤放疗疗效.方法经临床确诊的30例未治疗的脑肿瘤患者,肘静脉注射99Tcm-HL91 740 MBq后进行早期(10 min)、中期(2 h)和晚期(4 h)显像.应用感兴趣区(ROI)技术勾画并分别测定早、中、晚期肿瘤部位放射性计数(T),以及对侧相应部位放射性计数(N),求出相应T/N比值.检查后患者接受放射治疗,4周后按WHO标准,在放疗科医师协助下进行放疗疗效评价,分为完全缓解(CR),部分缓解(PR),无变化(NC)和进展加重(PD),并与99Tcm-HL91显像结果比较.结果①30例脑肿瘤患者99Tcm-HL91显像早、中、晚各时相的T/N比值分别为1.453±0.292,1.532±0.299和1.607±0.305,各时相间差异均有显著性(P=0.000,双侧).②30例脑肿瘤患者中CR 0例,PR 15例,NC 6例,PD 1例,死亡或失访共8例;放疗有效组(CR+PR)与放疗无效组(NC+PD)99Tcm-HL91显像早、中和晚期相T/N比值分别为1.333±0.277与1.779±0.183,1.409 ±0.274与1.856±0.185和1.484±0.278与1.937±0.191,差异均有显著性(P=0.001,双侧).③受检者均未发现主观性不适和毒副作用.④99Tcm-HL91在鼻、口咽部有明显放射性摄取.结论99Tcm-HL91脑肿瘤显像可预测脑肿瘤的放疗敏感性,对鼻、口咽部肿瘤应用价值较低.     

心肌乏氧显像及其临床应用

心肌乏氧显像是通过评价心肌氧供与氧耗平衡而提供检测缺血但存活心肌的一种非侵入性检查方法，而且是评价血管生成及心肌病的发生和发展的有用指标。动物实验和已有的临床研究表明，^18F标记的硝基咪唑类化合物、有广泛应用前景的^99^Tc^m标记的咪唑类化合物以及其他新的乏氧显像剂已用于评价缺血存活心肌。广泛的临床应用有待于进一步实验及临床研究。     

心肌乏氧显像及其临床应用

心肌乏氧显像是通过评价心肌氧供与氧耗平衡而提供检测缺血但存活心肌的一种非侵入性检查方法,而且是评价血管生成及心肌病的发生和发展的有用指标。动物实验和已有的临床研究表明,18F标记的硝基咪唑类化合物、有广泛应用前景的99Tcm标记的咪唑类化合物以及其他新的乏氧显像剂已用于评价缺血存活心肌。广泛的临床应用有待于进一步实验及临床研究。     

99mTc-HL91乏氧显像探测肿瘤乏氧状态的研究进展

乏氧显像剂99mTc-HL91能选择性地浓集于肿瘤的乏氧组织或细胞中,通过核医学显像探测肿瘤组织的乏氧,能直接提供肿瘤组织乏氧及其乏氧程度和分布的证据,不仅能用于恶性肿瘤的早期诊断,还能动态监测肿瘤组织乏氧状态,为临床诊断和治疗决策提供重要信息。     

99mTc-MIBI联合99mTc-HL9l乏氧显像对60例原发性肺癌的诊断评价

目的 探讨^99m Tc-甲氧基异丁基异腈（^99m Tc-MIBI）肺亲肿瘤显像联合^99m Tc-4，9-二氮-3，3，10，10-四甲基十二烷-2，11-二酮肟（^99m Tc-HL91）乏氧显像对原发性肺癌的诊断效能。方法 对60例拟诊断原发性肺癌患者，术前进行^99m Tc-MIBI及^99m Tc-HL91显像，以病理结果为金标准，分析^99m Tc-MIBI联合^99m Tc-HL91显像对原发性肺癌的诊断价值。结果 病理结果证实原发性肺癌48例，良性病变12例。^99m Tc-MIBI、^99m Tc-HL91和^99m Tc-MIBI＋^99m Tc-HL91显像对原发性肺癌诊断的灵敏度、特异度和准确率分别为89．6％（43／48）、77．1％（37／48）、95．8％（46／48），75．0％（9／12）、91．7％（11／12）、83．3％（10／12）和86．7％（52／60）、80．0％（48／60）、93．3％（56／60）。结论^99m Tc-MIBI肺亲肿瘤显像联合^99m Tc-HL91乏氧显像有助于提高对原发性肺癌的诊断效能。     

鼻咽癌乏氧程度与放疗中期肿瘤退缩关系的初步研究

目的 探讨4,9-二氮-3,3,10,10-四甲基十二烷-2,11-二酮肟(99mTc-HL91)乏氧显像评价鼻咽癌病灶的乏氧程度与放疗中期肿瘤退缩程度的关系。方法 对接受根治性、连续性放疗的34例Ⅱ~Ⅳ a期鼻咽癌初治患者在放疗前一周内进行头颈部99mTc-HL91 SPECT及同机CT图像融合,分别计算原发病灶和颈淋巴结转移灶与大脑、颈部肌肉的平均放射性活度比值和测量放疗中期鼻咽癌原发病灶与颈部转移淋巴结的退缩程度。结果 ①乏氧阳性鼻咽癌病灶直径[(1.70±0.68)cm]与原发病灶/颈部肌肉和原发病灶/大脑的放射性比值呈正相关,相关系数分别为0.607和0.640,P值分别为0.001和0.000.②放疗中期鼻咽癌原发肿瘤退缩程度Ⅰ级和Ⅲ级的原发病灶/颈部肌肉和原发病灶/大脑的放射性比值差异有显著性,P值分别为0.001、0.004,Ⅰ级与Ⅱ级、Ⅱ级与Ⅲ级比值无显著性差异;放疗中期鼻咽癌原发灶退缩程度与原发病灶/颈部肌肉和原发病灶/大脑的放射性比值呈负相关,相关系数分别为-0.602和-0.643,P<0.01.③99mTc-HL91乏氧显像检出颈部转移淋巴结28处,淋巴结转移灶/颈部肌肉和淋巴结转移灶/大脑的放射性比值与其大小、中期放疗退缩程度无明显的线性趋势。结论 鼻咽癌病灶越大,其乏氧程度越高,中期放疗退缩越小;颈部转移淋巴结乏氧程度与其直径、放疗中期退缩程度无明显关系。     

99Tcm-HL91乏氧显像在恶性肿瘤治疗后随访中的应用

Objective 99Tcm-4, 9-diaza-3, 3, 10, 10-tetramethyldodecan-2, 11-dione dioxime (HL91) is a new hypoxia imaging agent that demonstrates increased uptake and retention in tumor hypoxic tissues in vivo. The objective of this study was to evaluate the clinical value of 99Tcm-HL91 hypoxia imaging in post-therapeutic patients with cancers. Methods Thirty-seven patients with primary cancers at head and neck and upper aerodigestive region who were suspected to have residual, recurrent, or metastatic disease at either clinical follow-up or by regular CT follow-up, were included. All underwent 99Tcm-HL91 imaging. The radioactivity ratios of tumor to normal tissues (T/NT) were calculated using the region of interest (ROI) technique. A t-test was used for data analysis. The " gold standard" of diagnostic accuracy was based on histopathology or clinical follow-up. Results were compared between 99Tcm-HL91 and CT. Results Of the 37 patients, 11 had either residual or recurrent lesions and 7 had distant disease. (1) A significantly higher 99Tcm-HL91 uptake were noted in residual or recurrent lesions than benign lesions (1.58 ± 0. 16 vs 1.18 ±0.14, t =4. 87, P <0.001). (2) The sensitivity, specificity, and accuracy for residual or recur-rent lesions were 72. 73% (8/11), 63.64% (7/11), 4/4; 89.47% (17/19), 84. 21% (16/19), 94. 12% (16/17), and 83.33% (25/30), 76.67% (23/30), 95.24% (20/21) in 99Tcm-HL91, CT, and combined 99Tcm-HL91 and CT, respectively. (3) For distant sites detection (n = 7), CT detected all but 99Tcm-HL91 missed three. Conclusions A combination of 99Tcm-HL91 and CT in detection either residu-al, recurrent, or metastatic disease would have the highest benefit in patients with cancers at head and neck and upper aerodigestive region.     

99Tcm-HL91乏氧显像在恶性肿瘤治疗后随访中的应用

Objective 99Tcm-4, 9-diaza-3, 3, 10, 10-tetramethyldodecan-2, 11-dione dioxime (HL91) is a new hypoxia imaging agent that demonstrates increased uptake and retention in tumor hypoxic tissues in vivo. The objective of this study was to evaluate the clinical value of 99Tcm-HL91 hypoxia imaging in post-therapeutic patients with cancers. Methods Thirty-seven patients with primary cancers at head and neck and upper aerodigestive region who were suspected to have residual, recurrent, or metastatic disease at either clinical follow-up or by regular CT follow-up, were included. All underwent 99Tcm-HL91 imaging. The radioactivity ratios of tumor to normal tissues (T/NT) were calculated using the region of interest (ROI) technique. A t-test was used for data analysis. The " gold standard" of diagnostic accuracy was based on histopathology or clinical follow-up. Results were compared between 99Tcm-HL91 and CT. Results Of the 37 patients, 11 had either residual or recurrent lesions and 7 had distant disease. (1) A significantly higher 99Tcm-HL91 uptake were noted in residual or recurrent lesions than benign lesions (1.58 ± 0. 16 vs 1.18 ±0.14, t =4. 87, P <0.001). (2) The sensitivity, specificity, and accuracy for residual or recur-rent lesions were 72. 73% (8/11), 63.64% (7/11), 4/4; 89.47% (17/19), 84. 21% (16/19), 94. 12% (16/17), and 83.33% (25/30), 76.67% (23/30), 95.24% (20/21) in 99Tcm-HL91, CT, and combined 99Tcm-HL91 and CT, respectively. (3) For distant sites detection (n = 7), CT detected all but 99Tcm-HL91 missed three. Conclusions A combination of 99Tcm-HL91 and CT in detection either residu-al, recurrent, or metastatic disease would have the highest benefit in patients with cancers at head and neck and upper aerodigestive region.     

99Tcm-HL91乏氧显像在恶性肿瘤治疗后随访中的应用

Objective 99Tcm-4, 9-diaza-3, 3, 10, 10-tetramethyldodecan-2, 11-dione dioxime (HL91) is a new hypoxia imaging agent that demonstrates increased uptake and retention in tumor hypoxic tissues in vivo. The objective of this study was to evaluate the clinical value of 99Tcm-HL91 hypoxia imaging in post-therapeutic patients with cancers. Methods Thirty-seven patients with primary cancers at head and neck and upper aerodigestive region who were suspected to have residual, recurrent, or metastatic disease at either clinical follow-up or by regular CT follow-up, were included. All underwent 99Tcm-HL91 imaging. The radioactivity ratios of tumor to normal tissues (T/NT) were calculated using the region of interest (ROI) technique. A t-test was used for data analysis. The " gold standard" of diagnostic accuracy was based on histopathology or clinical follow-up. Results were compared between 99Tcm-HL91 and CT. Results Of the 37 patients, 11 had either residual or recurrent lesions and 7 had distant disease. (1) A significantly higher 99Tcm-HL91 uptake were noted in residual or recurrent lesions than benign lesions (1.58 ± 0. 16 vs 1.18 ±0.14, t =4. 87, P <0.001). (2) The sensitivity, specificity, and accuracy for residual or recur-rent lesions were 72. 73% (8/11), 63.64% (7/11), 4/4; 89.47% (17/19), 84. 21% (16/19), 94. 12% (16/17), and 83.33% (25/30), 76.67% (23/30), 95.24% (20/21) in 99Tcm-HL91, CT, and combined 99Tcm-HL91 and CT, respectively. (3) For distant sites detection (n = 7), CT detected all but 99Tcm-HL91 missed three. Conclusions A combination of 99Tcm-HL91 and CT in detection either residu-al, recurrent, or metastatic disease would have the highest benefit in patients with cancers at head and neck and upper aerodigestive region.     

99Tcm-HL91乏氧显像在恶性肿瘤治疗后随访中的应用

Objective 99Tcm-4, 9-diaza-3, 3, 10, 10-tetramethyldodecan-2, 11-dione dioxime (HL91) is a new hypoxia imaging agent that demonstrates increased uptake and retention in tumor hypoxic tissues in vivo. The objective of this study was to evaluate the clinical value of 99Tcm-HL91 hypoxia imaging in post-therapeutic patients with cancers. Methods Thirty-seven patients with primary cancers at head and neck and upper aerodigestive region who were suspected to have residual, recurrent, or metastatic disease at either clinical follow-up or by regular CT follow-up, were included. All underwent 99Tcm-HL91 imaging. The radioactivity ratios of tumor to normal tissues (T/NT) were calculated using the region of interest (ROI) technique. A t-test was used for data analysis. The " gold standard" of diagnostic accuracy was based on histopathology or clinical follow-up. Results were compared between 99Tcm-HL91 and CT. Results Of the 37 patients, 11 had either residual or recurrent lesions and 7 had distant disease. (1) A significantly higher 99Tcm-HL91 uptake were noted in residual or recurrent lesions than benign lesions (1.58 ± 0. 16 vs 1.18 ±0.14, t =4. 87, P <0.001). (2) The sensitivity, specificity, and accuracy for residual or recur-rent lesions were 72. 73% (8/11), 63.64% (7/11), 4/4; 89.47% (17/19), 84. 21% (16/19), 94. 12% (16/17), and 83.33% (25/30), 76.67% (23/30), 95.24% (20/21) in 99Tcm-HL91, CT, and combined 99Tcm-HL91 and CT, respectively. (3) For distant sites detection (n = 7), CT detected all but 99Tcm-HL91 missed three. Conclusions A combination of 99Tcm-HL91 and CT in detection either residu-al, recurrent, or metastatic disease would have the highest benefit in patients with cancers at head and neck and upper aerodigestive region.     

99Tcm-HL91乏氧显像在恶性肿瘤治疗后随访中的应用

Objective 99Tcm-4, 9-diaza-3, 3, 10, 10-tetramethyldodecan-2, 11-dione dioxime (HL91) is a new hypoxia imaging agent that demonstrates increased uptake and retention in tumor hypoxic tissues in vivo. The objective of this study was to evaluate the clinical value of 99Tcm-HL91 hypoxia imaging in post-therapeutic patients with cancers. Methods Thirty-seven patients with primary cancers at head and neck and upper aerodigestive region who were suspected to have residual, recurrent, or metastatic disease at either clinical follow-up or by regular CT follow-up, were included. All underwent 99Tcm-HL91 imaging. The radioactivity ratios of tumor to normal tissues (T/NT) were calculated using the region of interest (ROI) technique. A t-test was used for data analysis. The " gold standard" of diagnostic accuracy was based on histopathology or clinical follow-up. Results were compared between 99Tcm-HL91 and CT. Results Of the 37 patients, 11 had either residual or recurrent lesions and 7 had distant disease. (1) A significantly higher 99Tcm-HL91 uptake were noted in residual or recurrent lesions than benign lesions (1.58 ± 0. 16 vs 1.18 ±0.14, t =4. 87, P <0.001). (2) The sensitivity, specificity, and accuracy for residual or recur-rent lesions were 72. 73% (8/11), 63.64% (7/11), 4/4; 89.47% (17/19), 84. 21% (16/19), 94. 12% (16/17), and 83.33% (25/30), 76.67% (23/30), 95.24% (20/21) in 99Tcm-HL91, CT, and combined 99Tcm-HL91 and CT, respectively. (3) For distant sites detection (n = 7), CT detected all but 99Tcm-HL91 missed three. Conclusions A combination of 99Tcm-HL91 and CT in detection either residu-al, recurrent, or metastatic disease would have the highest benefit in patients with cancers at head and neck and upper aerodigestive region.     

99Tcm-HL91乏氧显像在恶性肿瘤治疗后随访中的应用

Objective 99Tcm-4, 9-diaza-3, 3, 10, 10-tetramethyldodecan-2, 11-dione dioxime (HL91) is a new hypoxia imaging agent that demonstrates increased uptake and retention in tumor hypoxic tissues in vivo. The objective of this study was to evaluate the clinical value of 99Tcm-HL91 hypoxia imaging in post-therapeutic patients with cancers. Methods Thirty-seven patients with primary cancers at head and neck and upper aerodigestive region who were suspected to have residual, recurrent, or metastatic disease at either clinical follow-up or by regular CT follow-up, were included. All underwent 99Tcm-HL91 imaging. The radioactivity ratios of tumor to normal tissues (T/NT) were calculated using the region of interest (ROI) technique. A t-test was used for data analysis. The " gold standard" of diagnostic accuracy was based on histopathology or clinical follow-up. Results were compared between 99Tcm-HL91 and CT. Results Of the 37 patients, 11 had either residual or recurrent lesions and 7 had distant disease. (1) A significantly higher 99Tcm-HL91 uptake were noted in residual or recurrent lesions than benign lesions (1.58 ± 0. 16 vs 1.18 ±0.14, t =4. 87, P <0.001). (2) The sensitivity, specificity, and accuracy for residual or recur-rent lesions were 72. 73% (8/11), 63.64% (7/11), 4/4; 89.47% (17/19), 84. 21% (16/19), 94. 12% (16/17), and 83.33% (25/30), 76.67% (23/30), 95.24% (20/21) in 99Tcm-HL91, CT, and combined 99Tcm-HL91 and CT, respectively. (3) For distant sites detection (n = 7), CT detected all but 99Tcm-HL91 missed three. Conclusions A combination of 99Tcm-HL91 and CT in detection either residu-al, recurrent, or metastatic disease would have the highest benefit in patients with cancers at head and neck and upper aerodigestive region.