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MPN学习笔记一(ET诊断)

  • 2026-04-22 12:05:28
MPN学习笔记一(ET诊断)
学习笔记:赵俊暕老师原发性血小板增多症诊断与鉴别诊断,原视频链接:【青鸾云讲堂 · 2026全国巡讲季|第1站(河北)视频回放】原发性血小板增多症诊断与鉴别诊断
常见克隆性血小板增多(PLT≥450×10^9)疾病:
1. ET(原发性血小板增多症,71%);
2. PV(真性红细胞增多症,17%);
3. PMF(原发性骨髓纤维化,5%);
4. MDS/MPN(骨髓增生异常/骨髓增殖性重叠综合症,3%);
5. CML(慢性髓细胞白血病,2%);
6.MPN-U(未分类骨髓增殖性肿瘤,2%)。
             原发性血小板增多症(ET)诊断与鉴别诊断
一、 定义、流行病学及症状:

1. ET属于骨髓增殖性肿瘤(MPN)。

2. 一半以上患者无症状,中位年龄为59岁。

3.   a、微循环症状:红斑性肢痛症、肢端感觉异常、脚趾、手指烧灼感、视力模糊或偏头痛;

      b、诊断时体征:可触及脾肿大、动静脉血栓形成、大出血。

二、 诊断流程:

实验室检查:

1. 血常规以血小板增多为突出表现,白细胞数正常或增高,一般不超过50X109/L;红细胞数正常或轻度增多,少数患者贫血,疾病终末期也可呈现三系减少。

2. 外周血涂片可见血小板聚集成堆、大小不一,可见巨大、畸形血小板

2. 骨髓象;增生程度正常,以巨核细胞增生为主,粒系和红系增生正常且无左移,巨核细胞呈随机分布或呈松散簇,巨核细胞体积大或巨大,胞核过分:叶(如鹿角状),胞质成熟正常。血小板聚集成堆,细胞化学染色NAP积分增加。

3. 骨髓活检(确诊必要):巨核细胞系过度增殖,胞体增大、高度分叶的巨核细胞增多,无异型性。粒系或红系生成无明显增加或左移。骨髓网状纤维染色一般为正常(0级),极少数为轻度增多。髓窦扩张不明显,窦内造血细胞不常见。

诊断ET需排除其他原因导致的血小板增多。

4. 分子相关异常:ET属于骨髓增殖性肿瘤,为多能造血干细胞克隆性疾病,通常具有:

1). 位于9号染色体上的Janus激酶2(JAK2)

2). 位于19号染色体上的钙网蛋白(CALR)

3). 位于1号染色体上的血小板生成素受体(骨髓增殖性白血病病毒癌基因,MPL)的功能获得性基因变异。

5. 若出现幼红、幼粒细胞,并伴有泪滴状红、红细胞形态异常以及外周血中有核红细胞和正在成熟的髓系前体细胞,则提示疾病可能已进展为原发性血小板增多症后骨髓纤维化(post-ETMF)

6. 约10%ET无JAK2/CALR/MPL基因突变称为三阴性(Triple negative)ET,年轻患者更多见。

7. 1)、其他突变:TET2(9%-11%)、ASXL1(7%-20%)、DNMT3A(7%)和SF3B1(5%)

    2)、异常核型:+9/20q-/13q-

    3)、 其他基因变异(如SF3B1、SRSF2、U2AF1、TP53)与生存期缩短相关,并且可能与JAK2、CALR或MPL变异同时存在

附临床相关病例(见看图猜诊断第八期):

男,29岁,体检PLT增多就诊,

WBC:7.31×10⁹/L,Hb:147g/L,PLT:903×10⁹/L↑↑↑。

骨髓涂片(瑞氏吉姆萨染色):

结论:ET(原发性血小板增多症)。

ET(原发性血小板增多症)相关学习:
1. 诊断标准:
①血小板计数≥450×109/L
②骨髓病理示巨核细胞高度增生,胞体大、核分叶过多的成熟巨核细胞数量增多,粒系及红系无显著增生或左移,且网状纤维极少轻度(1级)增多;
③不能满足BCR-ABL阳性慢性髓性白血病、真性红细胞增多症(PV)、原发性骨髓纤维化(PMF)、骨髓增生异常综合征和其他髓系肿瘤的WHO诊断标准;
存在JAK2、CALR或MPL基因突变。次要诊断指标:存在其他克隆性证据或排除反应性血小板增多。
符合4条主要标准或前3条主要标准和次要标准即可诊断ET。
二、实验室检查:
1. 血象:Hb一般正常,出血者可导致小细胞低色素性贫血;WBC正常或增多,多在(10-30)×10⁹/L,PLT≥450×10⁹/L,PLT易见,可偶见幼稚粒细胞、有核红细胞、大血小板、畸形血小板等,其余明显异常未见。
2. 骨髓象:骨髓增生活跃或明显活跃,粒红比大致正常,巨核系常增生明显,以颗粒巨和产板巨为主,可见胞体增大、胞核分叶过多巨核细胞等。PLT易见、极易见,呈大堆、大片分布,可见大血小板、畸形血小板。由于骨髓明显增生或伴骨髓纤维化,可出现干抽而呈“增生减低”;个别患者可出现原始细胞增多转变为急性白血病。
3. 骨髓活检:常见与年龄不相符的细胞量轻中度增多,多为粒系和巨核系增殖或巨核细胞单系增殖。最醒目的异常是大至巨大型巨核细胞常呈松散或紧密的丛簇状生长,位于骨小梁旁区和间区。巨核细胞胞质丰富成熟,胞核深染和多核叶,常呈平滑的核型,不见PMF时的高度异形性。网状纤维正常或轻度增加,可见局灶性纤维化。
4. 细胞遗传学和分子学:细胞遗传学无特征性所见,约5%-10%病人可见del(13q22)、+8、+9等异常。约50%-60%病例有JAK2 V617F或功能上类似的突变,30%有CALR突变,3%病例有MPL获得性突变。在反应性血小板增多病例中都不见这些突变。因此,检出这些基因突变可排除反应性疾病。ET患者中,JAK2阳性与较高的血栓形成率有关;CALR阳性与较高的血小板数和较高的MF转化率有关;上述三种基因均未发生突变患者生存期最长,MPL突变患者最短。
相关学习笔记链接:
骨髓增生异常骨髓增殖性肿瘤(MDS/MPN)学习笔记一(总论)
MDS/MPN学习笔记二(CMML)
MDS/MPN学习笔记三(MDS/MPN-N)-1
MDS/MPN学习笔记四(MDS/MPN-SF3B1-T)

声明:本人不是知识的生产者,仅分享日常所学笔记,仅代表个人观点,所用的参考文献已详细标记出处,侵权请联系删除,所有内容及观点均不保证正确,仅供个人交流学习用,不能作为医疗建议或参考,最后欢迎大家留言指正,共同学习进步。

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  1. CONNECT:[ UseTime:0.000475s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000693s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000311s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000271s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000537s ]
  6. SELECT * FROM `set` [ RunTime:0.000202s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000520s ]
  8. SELECT * FROM `article` WHERE `id` = 482948 LIMIT 1 [ RunTime:0.000431s ]
  9. UPDATE `article` SET `lasttime` = 1776846081 WHERE `id` = 482948 [ RunTime:0.000706s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000218s ]
  11. SELECT * FROM `article` WHERE `id` < 482948 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000404s ]
  12. SELECT * FROM `article` WHERE `id` > 482948 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000360s ]
  13. SELECT * FROM `article` WHERE `id` < 482948 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000793s ]
  14. SELECT * FROM `article` WHERE `id` < 482948 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000803s ]
  15. SELECT * FROM `article` WHERE `id` < 482948 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000825s ]
0.075242s