上皮样胃肠道间质瘤12例临床病理分析

目的探讨上皮样细胞型胃肠道间质瘤(gastrointestinal stromal tumors,GIST)的病理形态、免疫表型特征及鉴别诊断。方法对12例上皮样GIST进行形态观察,免疫组化标记,并结合相关文献进行讨论。结果本组上皮样GIST男女之比为2∶1,平均年龄53.5岁。发生部位包括胃3例,小肠3例,肠系膜2例,网膜3例,腹膜后GIST侵犯肾脏1例。除3例活检小标本外,其余9例肿瘤均完整切除。上皮样GIST镜下形态以圆形、卵圆形或短梭形上皮样细胞为主,瘤细胞中等大小,胞质略嗜酸,细颗粒状。核圆或卵圆形,多为单核,偶见多核细胞。多数病例还可见多少不等的空泡样细胞或核偏位呈印戒样细胞。肿瘤细胞呈器官样构型(4例)、大的片块状构型(3例)、富细胞性构型(4例)及假乳头状构型(1例)。免疫组织化学标记显示绝大多数上皮样GIST表达CD117、CD34或Dog-1,而不表达CK、Syn、Melan-A等。结论上皮样GIST因其细胞形态和组织结构具有上皮性肿瘤的特点而可能与之混淆,CD117和CK免疫标记可明确诊断。     

29例上皮样胃肠间质瘤的临床病理特征

目的:探讨29例上皮样胃肠间质瘤(gastrointestinal stromal tumors,GIST)的组织学形态和免疫组织化学特点以及诊断和鉴别诊断,对临床正确诊断治疗和判断预后具有十分重要的临床意义.方法:回顾性分析安阳市肿瘤医院病理科2009年月3月至2016年8月321例完整切除GIST标本,经筛查并重新阅片诊断上皮样GIST 29例.结果:29例上皮样GIST,发生胃部15例,小肠2例,肠系膜3例,直肠4例,腹腔3例,腹膜后1例,盆腔1例.恶性GIST 25例,良性4例.瘤细胞丰富,胞质嗜酸或透明,部分瘤细胞核质比高,核大小不等具有多形性,核分裂较多,可伴有多灶凝固性坏死,间质多数伴有黏液样变性.组织结构形成器官样、片状、巢状及腺泡状等.免疫组织化学CD34,DOG-1在上皮样GIST均弥漫阳性(阳性率100%),CD117阳性率(86%).结论:上皮样GIST发生部位广泛,形态多变,易误诊其他上皮样分化的肿瘤;免疫组织化学CD34,DOG-1,CD117在上皮样GIST诊断及鉴别诊断中具有重要价值;如肿物较大、细胞丰富、核分裂多、间质黏液样变性;绝大多数要考虑恶性GIST.     

胃肠道间质瘤的光镜、免疫组织化学和超微结构的观察

目的 研究胃肠道间质瘤（GISTs）的光镜,电镜形态特点和免疫组织化学在诊断中的价值,探讨肿瘤的组织来源和分型。方法 对GISTs进行光镜和超微结构的观察,用EnVision二步法免疫组织化学方法检测波形蛋白,CD117（c-kit),CD34等8种抗原标记物在肿瘤中的表达情况。结果 65例GISTs占同期消化系统间叶性肿瘤的85．5％（65／76）;其中梭形细胞为主的有46例,伴有上皮样细胞的有13例,单纯由上皮样细胞组成的有6例,瘤细胞呈长,短梭形和圆形,胞质弱嗜酸,常见核端空泡,有时呈印戒样或透明细胞样;排列呈旋涡状,栅栏状或弥漫性巢状。超微结构表现出树枝样突起,神经内分泌颗粒,桥粒样连接等神经分化特点,或（和）胞质内出现密斑,密体等肌性分化。免疫组织化学显示肿瘤组织中抗原标记物表达阳性率波表蛋白为100％（65／65）,CD11793．8％（61／65）,CD3478．5％（51／65）。结论 GISTs是消化道最常见的间叶性肿瘤,光镜形态与真性肌源性和神经源性肿瘤极为相似,电镜和CD117,CD34等免疫标记物配合使用可对其做作出正确诊断,GISTs可能起源于多潜能的,卡哈尔间质细胞样的前体细胞。     

胃肠道间质瘤临床病理及免疫组织化学特征

目的 探讨胃肠道间质瘤的免疫组织化学特征，为其诊断及鉴别诊断和预后提供依据。方法 对消化道内169例间叶源性肿瘤进行免疫组织化学标记和形态学观察，确诊113例胃肠道间质瘤。结果 肿瘤多见于胃，临床常见首发症状为消化道出血及腹部包块。瘤细胞主要有梭形细胞及上皮样细胞两种形态，梭形细胞型70例，上皮样细胞型10例，混合细胞型33例。相对良性33例，交界性26例，恶性54例。免疫表型：CD117阳性112例，CD34阳性102例，阳性率分别为99．1％及90．2％，且呈弥漫强阳性表达。结论 胃肠道间质瘤是消化道最常见间叶源性肿瘤，以胃内多见；主要有2种细胞形态和3种组合形式；确诊需要依靠CD117、CD34等免疫标记物配合。     

GIST外科治疗新探

GIST(胃肠道间质瘤)是一类特殊的,通常CD117免疫表型阳性的胃肠道最常见的间叶源性肿瘤.组织学上由梭形细胞、上皮样细胞、偶或多形性细胞排列成束状或弥漫状图像,免疫表型上表达c-kit基因蛋白产物KIT,由突变的c-kit或血小板源生长因子受体(PDGFRA)基因驱动.本文主要运用文献资料法、逻辑推理法以及笔者多年工作经验,针对GIST外科治疗进行论述,希望能进一步促进GIST治疗手段的进步.     

胃肠、泌尿、会阴部间质瘤临床病理及免疫组织化学分析

目的 探讨胃肠道间质瘤(GIST)与胃肠道外GIST型间质瘤的组织学起源与病理特征。方法 对46例胃肠道及13例泌尿道、会阴部原诊断平滑肌瘤、平滑肌肉瘤、许旺瘤的病例作回顾性研究,观察其病理特点,应用免疫组织化学方法观察4种抗体(CD117、CD34、平滑肌肌动蛋白、S—100)的表达,对发生于不同部位的间质瘤进行对比分析。结果 45例为GIST组,CD117阳性表达率为93．3％,CD34阳性率88．9％;12例为胃肠道外GIST型间质瘤组,CDll7阳性表达率为83．3％,CD34阳性率75．0％;2例(其中1例为胃肠道)平滑肌瘤组,CDll7和CD34均为阴性,平滑肌肌动蛋白瘤细胞呈弥漫性强阳性表达。结论 CDll7和CD34标记阳性是确诊间质瘤最具有诊断价值的依据。推测GIST和胃肠道外GIST型间质瘤均系起源于一种非定向分化的、原始间充质干细胞。     

胃肠道间质瘤76例的临床病理及免疫组织化学特征

目的：探讨胃肠道间质瘤（GIST）的临床表现、病理组织形态学和免疫组织化学特点及良恶性参考指标。方法：用CD117、CD34等抗体,通过免疫组织化学EnVision法对原发性消化道间叶源性肿瘤进行研究,确诊76例GIST,并结合随访资料,对其生物学行为进行分析。结果：本组GIST均为成年人,年龄32－81岁（平均54岁）,男性39例,女性37例,发生于胃34例,小肠23例,结肠2例,直肠17例,最常见症状为腹部肿块、腹部胀痛不适及消化道出血。黏膜下生长者3例,浆膜外生长者25例,余48例主要位于肌壁。大体上,肿瘤较易出现出血、坏死、囊性变等继发性改变。镜下观察,梭形细胞型46例,上皮样细胞型9例,梭形／上皮样细胞混合型21例,呈交叉束状、弥漫片状、栅栏状、漩涡状、小巢状、器官样及假菊形团样排列,瘤细胞胞质空亮、淡伊红、轻至中度嗜伊红及略嗜碱,核梭形、卵圆、圆形或镰状。CD117和CD34多为弥漫强阳性,阳性率分别为98．7％、68．4％,α-平滑肌肌动蛋白（ α-SMA）、肌特异性肌动蛋白、S-100、蛋白基因产物9．5呈片状或局灶阳性,阳性率分别为25．0％、19．7％、23．7％、17．1％,波形蛋白均阳性,结蛋白、胶质纤维酸性蛋白、神经丝蛋白均阴性。76例GIST中,良性9例,交界性19例,恶性48例。良性及交界性获访20例均健在,恶性组获访34例,10例无瘤生存,10例复发及转移,14例死亡。各组之间术中黏连、瘤体直径大于5cm、核分裂象大于5／50HPF差异有显著性意义,肿瘤性坏死、核分裂象大于10／50HPF、细胞密集明显异型者均在恶性组。恶性组内,肿瘤性坏死或核分裂象大于5／50HPF者3年生存率的差异有显著性意义。结论：GISF好发于中老年人,肿瘤细胞形态多变,排列结构多样;免疫组织化学特征为CD117、CD34阳性,结蛋白阴性;除转移和浸润外,肿瘤性坏死、核分裂象大于10／50HPF、细胞密集明显异型等提示恶性,此外,术中粘连、瘤体直径大于5cm、核分裂象大于5／50HPF可作为良恶性参考指标。     

上皮样血管内皮瘤的临床病理分析

目的：探讨上皮样（组织细胞样）血管内皮瘤的临床病理学特点及其意义。方法：对9例上皮样血管内皮瘤进行光镜和免疫组织化学SP法检测,1例作电镜观察,结果：年龄16－47岁,平均32岁,男女性别差异无显著性意义。部位：头面部4例,上肢3例,下肢2例,形态特征：瘤细胞具有上皮样或组织细胞样的形态;瘤细胞圆形或多角开,三五成群呈小巢状,索状,不规则状排列,分布于粘液间质中;间质可显著或少量粘液样变或玻璃样变,瘤细胞内含有原始血管腔,核分裂角,多形性及坏死少见,部分病例伴有梭形细胞血管内皮瘤改变,1例见破骨细胞样的多核巨细胞,免疫组织化学检测7例,7例波形蛋白均阳性,5例第八因子相关抗原,CD31,CD34阳性,2例细胞角蛋白弱阳性,1例CD68和a1-抗胰蛋白酶阳性,电镜观察1例见胞质内含丰富的微丝和少许的W－P小体,6例随访－8年,3例在原发部位有1或2次复发,但未见有转移,结论：上皮样血管内皮瘤是一种低度恶性的软组织肉瘤,其病因学尚不清楚,熟悉其形态特征对避免误诊为其他类似病变具具有重要意义。     

74例胃肠道间质瘤临床病理与生物学行为评价

目的　探讨在胃肠道间质瘤(GIST)的病理诊断和预后分析上采用一种简单实用且重复性好的病理学“标准”,以利于GIST的日常病理诊断和生物学行为评价及指导治疗,并对Fletcher等推荐的GIST生物学行为评价表进行评估。方法　85例消化道间叶组织肿瘤,复习其病理形态学并应用CD117、CD34、平滑肌肌动蛋白(SMA)、结蛋白、S 100等进行免疫组织化学标记,结合 31例随访资料进行分析。结果　85例消化道间叶组织肿瘤中,GIST74例,平滑肌瘤和交界性平滑肌瘤 8例(食管),平滑肌肉瘤 1例(直肠 ),神经鞘瘤 1例 (胃 ),恶性纤维组织细胞瘤 1例 (肠系膜 )。74例GIST中,发生在胃和小肠的分别为 34例和 30例,占 86. 5%,食管 3例,胃肠道外(肠系膜、网膜、后腹膜)7例。年龄 23~80岁,平均 52 5岁, 40岁以上者占 85%,男性 45例,女性 29例。镜下观察:梭型细胞型 48例,上皮样细胞型 10例,混合细胞型 16例。瘤细胞呈长、短梭形和圆形,胞质丰富弱嗜酸性,排列呈旋涡状、栅栏状或弥漫巢状。免疫组织化学: 85例消化道间叶组织肿瘤波形蛋白均阳性,其中 74例表达CD117,诊断为GIST,表达形式有弥漫胞膜 /胞质强阳性、散在阳性、胞质点状着色等,其中 54例同时表达CD34 (阳性率 72. 9% ), 25例表达SMA, 5例表达结蛋白, 5例表达S 100蛋白。在 85例     

乳腺上皮样型管周间质肉瘤病理特征及与叶状肿瘤比较观察

目的 探讨乳腺上皮样型管周间质肉瘤的临床病理特点及与叶状肿瘤的关系。方法 采用HE、特殊染色、免疫组化染色(CK，EMA，S-100蛋白，SMA，Vim，Des，MG，CD34，CD99，CD117，PR，HMB45)对1例乳腺上皮样型管周间质肉瘤与5例叶状肿瘤(良性、交界性各1例，恶性3例)做比较性观察。结果 乳腺管周间质肉瘤(上皮样型)有独特的镜下图像：①显著的多角形(上皮样)细胞绕导管或小管的上皮肌上皮层呈间质性增生，无叶状结构；②组织学模式有袖套状、花冠状、菊形团状、结节状、融合结节状和片状浸润；③瘤细胞形态有：多角形(大、小)、柱状和梭形。多角形细胞呈上皮样形态，异型明显，核分裂象多见(10～30个／10HPF，个别区域达6个／1HPF)，病理性核分裂象易见，在浸润灶内见肿瘤性坏死；④瘤细胞Vim弥漫阳性、EMA灶性阳性、CD99和CD117灶性弱阳性、CD34少数阳性，CK、SMA、S-100蛋白、Des、MG、PR、HMB45均阴性。5例叶状肿瘤均具备叶状结构、间质过度增生、细胞密集(异质性分布)、核分裂象2～10个／10HPF等诊断要素。在3例恶性叶状肿瘤中，2例有极少的上皮样袖套状病灶，2例有梭形细胞袖套状病灶。结论 乳腺上皮样型管周间质肉瘤是一种极罕见的恶性纤维上皮肿瘤亚型，它可能是恶性叶状肿瘤的最早期病变，也可能是一种独特的类型。     

Immunohistochemical comparison of gastrointestinal stromal tumor and solitary fibrous tumor

CONTEXT: The differential diagnosis of gastrointestinal stromal tumors (GIST) and solitary fibrous tumors (SFT) may be a diagnostic challenging because of overlapping clinicopathologic features. Many studies have shown consistent immunoreactivity for CD117 (c-Kit) in GIST. However, only a few studies have evaluated CD117 expression in SFT, and these studies have used an antibody from Santa Cruz Biotechnology. In non-GIST lesions, reactivity with this antibody has been shown to differ from that with a CD117 antibody from Dako Corporation. The immunoreactivity of SFT with the Dako CD117 antibody has not been reported. Conversely, CD99 is a marker for SFT, and its expression in GIST has not been evaluated. OBJECTIVE: To study the immunohistochemical profiles of GIST and SFT to evaluate their diagnostic overlap. DESIGN: We studied the immunoreactivity of 27 unequivocal GIST and 19 unequivocal extra-abdominal SFT for CD117, CD34, CD99, alpha-smooth muscle actin, vimentin, CD31, S100 protein, and muscle-specific actin. All antibodies, including CD117, were from Dako Corporation. RESULTS: We found positive immunoreactivity for CD117 in 100% of GIST and none of SFT; for CD34 in 89% of GIST, and 100% of SFT; for CD99 in 89% of GIST and 100% of SFT; for alpha-smooth muscle actin in 48% of GIST and 31% of SFT; for vimentin in 89% of GIST and 90% of SFT; and for muscle-specific actin in 22% of GIST and none of SFT. None of the GIST or SFT showed immunoreactivity for CD31 and S100 protein. CONCLUSIONS: The major difference between GIST and SFT was strong CD117 immunoexpression in all GIST and an absence of this expression in all SFT. With the exception of muscle-specific actin, the prevalence of immunoreactivity for the markers studied did not differ substantially between these 2 tumors. We conclude that GIST and SFT show distinctly divergent immunoprofiles with respect to CD117 and muscle-specific actin.     

Congenital gastrointestinal stromal tumour is morphologically indistinguishable from the adult form, but does not express CD117 and carries a favourable prognosis

AIMS: The histological and immunohistochemical features of a congenital stromal tumour of the jejunum are compared with those of adult gastrointestinal stromal tumours (GIST). The literature concerning the diagnosis and prognosis of congenital small intestinal stromal tumours is reviewed. METHODS AND RESULTS: A term female infant presented with intestinal obstruction, from birth. Histology of a 15-mm jejunal nodule showed a predominantly spindle-cell tumour with epithelioid areas. There was a low mitotic count and mild nuclear pleomorphism, extensive necrosis and haemorrhage, and focal calcification. Immunohistochemically, tumour cells stained for muscle specific actin and vimentin. Staining for CD117 (c-kit), S100, desmin and CD34 was negative. The features were compared to those of seven adult cases: no morphological feature was specific to the congenital tumour, which was smaller than the adult cases. There were no ultrastructural features specific for a particular line of differentiation. Immunohistochemical staining patterns were similar, except for CD117, which was strongly positive in all adult tumours, but negative in the congenital tumour. CONCLUSIONS: This congenital jejunal stromal tumour morphologically resembled adult GIST, but lack of c-kit expression suggests that it is nosologically distinct. Despite the presence of histological features which would cause the tumour to be categorized as malignant in an adult, it is apparent from previous reports of congenital small intestinal stromal tumours that the prognosis is favourable.     

Gastrointestinal Kaposi's sarcoma: CD117 expression and the potential for misdiagnosis as gastrointestinal stromal tumour

Aims:  Gastrointestinal Kaposi's sarcoma (KS) may mimic gastrointestinal stromal tumours (GISTs) histologically. Studies have shown that KS outside the gastrointestinal (GI) tract may express CD117, an antibody usually used to support a diagnosis of GIST. The aim was to evaluate the clinicopathological features of GI KS, including the expression of CD117 with and without antigen retrieval.
Methods and results:  Fourteen GI KS were assessed histologically, 12 of which were also subjected to immunohistochemistry for CD34, human herpesvirus (HHV) 8, DOG1 and CD117. CD117 immunohistochemistry was performed with and without antigen retrieval. All cases showed an infiltrative spindle cell tumour. Lamina propria infiltration, lymphoplasmacytic inflammation, extravasated red blood cells and haemosiderin were typical histological features. In all cases tumour cells were positive for CD34 and HHV8, but negative for DOG1. CD117 was positive in four of 12 cases without antigen retrieval and 10 of 12 cases with antigen retrieval.
Conclusions:  The microscopic distinction of GI KS from GIST can be difficult. Clues that raise the possibility of GI KS include young patient age, a history of immunosuppression, lamina propria infiltration, lymphoplasmacytic inflammation, extravasated red blood cells and haemosiderin deposition. Use of the immunomarkers CD117 (without antigen retrieval), HHV8 and DOG1 may aid in the distinction between GI KS and GIST.     

网膜和肠系膜胃肠道外间质瘤的临床病理研究

目的 研究网膜和肠系膜胃肠道外间质瘤(EGIST)临床病理和免疫组织化学标记特点,并探讨其组织来源、预后评价及与胃肠道间质瘤(GIST)的关系。方法 运用形态学和免疫组织化学(CD117、CD34等)研究19例网膜和肠系膜原诊断为平滑肌肿瘤、许旺瘤的间叶性肿瘤。结果 共诊断14例EGIST,其中网膜6例,肠系膜8例。肿瘤大小3．5～29．0cm(平均12．4cm)。梭形细胞为主型9例,上皮样细胞为主型2例,混合型3例。免疫组织化学阳性表达结果：CD117(14／14)、CD34(8／14)、α-平滑肌肌动蛋白(6／14)。结蛋白、S-100蛋白均阴性。随访结果：6例网膜EGIST均无瘤生存;7例肠系膜EGIST3例死于肿瘤,1例带瘤生存,3例无瘤生存。结论 EGIST与GIST为同一性质肿瘤,可能共同起源于多分化潜能的间叶干细胞或肿瘤向卡哈尔间质细胞分化。EGIST有独特的行为谱,预后评价不能完全套用GIST的评价指标。     

小肠间质瘤的免疫组织化学特征其意义

目的探讨小肠间质瘤的临床病理诊断及免疫组织化学特征。方法收集我校附属医院临床病理科6年来对外科手术切除的小肠肿瘤标本,光镜观察、免疫组织化学方法检测Vimentin、desmin、S-100、actin、CD117、CD34和SMA的表达。结果13例肿瘤中良性3例,潜在恶性4例,恶性6例;其中黏膜下生长3例,浆膜下生长5例,肠系膜处生长2例,肌壁内生长3例,常见症状是上腹部肿块和上消化道出血,免疫表形特征为:CD11713例(100%)胞质阳性表达;CD3410例阳性(76.9%)表达,S-100蛋白2例(15.4%)呈局灶表达,10例SMA阴性表达。结论小肠间质瘤发生率较高,多为恶性,有必要和肠的雪旺细胞瘤、平滑肌瘤相区别,CD117、CD34可作为诊断小肠间质瘤免疫标记物,而肿瘤大小、有无出血和坏死、核分裂像等均可作为良恶之判断的参照指标。     

The intermediate filament protein synemin (SYNM) was found to be more widespread in CD117+ gastrointestinal stromal cell tumors (GIST) than the CD34 transmembrane phosphoglycoprotein: an immunohistochemical study

Interstitial cells of Cajal (ICC) are the pacemaker cells in the gastrointestinal system, initiating the rhythmic systematic contraction of smooth muscle to regulate peristalsis. Benign ICC are identified immunohistochemically by positive staining for CD117, c-kit tyrosine kinase receptor. CD117 expression is maintained during the malignant transformation of ICC into gastrointestinal stromal cell tumors (GIST). However, to date, no single reliable marker for GIST has been identified by immunohistochemical (IHC) staining, and correct diagnosis depends on IHC staining results using multiple markers. This study compared the reactivities of synemin (SYNM) intermediate filament protein and CD34, a known marker for stem cells, endothelial cells, and many GIST tumors, in 54 formalin-fixed, paraffin-embedded GIST, which were determined by this study to be CD117 positive. Double-immunofluorescence (IF) staining was also used to assess whether CD117 and SYNM were co-expressed by ICC. While 81.5% of the GIST were CD34⁺, 92.9% of these tumors were SYNM⁺. ICC were CD117⁺/SYNM⁺, whereas mast cells were CD117⁺/SYNM^?. Because the percentage of CD117⁺/SYNM⁺ GIST was higher than the percentage of 117⁺/CD34⁺ GIST, this study suggested that SYNM was a better marker than CD34 for GIST diagnosis. In addition, differential expression of SYNM and CD117 helped distinguish between ICC and mast cells.     

胃肠道间质瘤病理及CD117和CD34表达与意义

目的：对本院病案资料中GIST重新分类，加 强对胃肠道间质瘤的认识。方法：用CD117、CD34、α-SMA、S-100等抗 体对56例GIST进行标记、分类，根据GIST的临床病理及形态学特点，正确诊断，并探讨 GIST的临床特点。结果:56例GIST CD117、CD34弥漫强表达，抗体 阳性率分别为CD117（50/56，89.3%）、CD34（37/56，66.1%），部分病例局灶表达α-SM A、S-100，阳性率分别为（17/56，30.4%）、（4/56，7.1%），结蛋白desmin均阴性。其 中良性及交界性29例，恶性27例。本组病例中胃及小肠GIST共达91.1％，其它部位少见。 结论：CD117、CD34在GIST表达显著，可作为GIST诊断的一个辅助指标。 胃和小肠GIST最常见，胃镜等影像学无特异性，诊断主要依靠病理诊断。组织病理不仅有助 于诊断，而且有助于预后的判断。     

Expression of c-kit (CD117) and Ki67 provides information about the possible cell of origin and clinical course of gastrointestinal stromal tumours

AIMS: Gastrointestinal stromal tumours (GIST) were analysed to determine their immunophenotype with emphasis on the expression of CD34 and c-kit and to identify a possible cell of origin. Furthermore, the aim was to correlate clinical, histological and immunophenotypic parameters to their clinical course by means of statistical analysis. METHODS AND RESULTS: An immunohistochemical analysis was performed on 64 cases of GIST. Three of the tumours displayed an immunohistochemical phenotype compatible with the diagnosis of leiomyomatous tumour. Almost half the tumours were stained positively for CD34 and 48 of 61 tumours were positive for c-kit (CD117), a marker of haematopoietic progenitor cells, mast cells and the so-called interstitial cell of Cajal (ICC). In most of the cases, the staining was strong and evenly distributed within the tumours. Statistical analysis on 31 cases with an appropriate follow-up time, showed that the expression of Ki67 in the nuclei of the tumour cells was the most important prognostic factor. CONCLUSIONS: Judging from the results of the immunohistochemistry, there would appear to be some justification for suggesting a label of ICC tumours for these c-kit-positive tumours without any other obvious phenotype. A discriminant function analysis allowed 90.3% of patients to be correctly classified in prognostic terms from data on Ki67 and CD34 expression, grade, size and patient age.