免疫组化特点
PEAC必须表达一种或多种消化道肿瘤免疫组化标志物(CDX2、CK20、MUC2)
如果肿瘤不表达任何消化道标志物,应诊断为“肺腺癌具有肠型形态”(lung adenocarcinoma with enteric morphology)
PEAC中TTF-1的表达有降低的趋势,而CK7的表达通常被保留,但是大约 10% 的高分化或中分化结直肠癌表达CK7/CK20
CK7 和 CDX-2 联合对于PEAC 的鉴别诊断具有较高敏感性(71.3%)和特异性(82%)
β-catenin和SATB2推荐用于鉴别PEAC和MCRC。肺腺癌中β-catenin的突变率为4-15%;SATB2在81-94%的MCRC中表达,但仅在10%的肺腺癌中表达
MUC1、HNF4α也可在PEAC中表达
高ERBB2、MMR和KRAS突变率;低EGFR和BRAF突变率
PEAC的TMB高于原发肺腺癌
有文章用机器学习的方法针对DNA甲基化数据对PEAC和MCRC进行分类,相关性较高的基因包括CACNB2 (Calcium Voltage-Gated Channel Auxiliary Subunit Beta 2), HOXA9 (Homeobox A9), HOXD1 (Homeobox D1), HOXD8 (Homeobox D8) and RNLS (Renalase, FAD dependent amine oxidase). KRT7 (Cytokeratin 7)也出现在top100的相关基因里面
学完了,学废了!
参考文献
1.Gong J, Fan Y, Lu H. Pulmonary enteric adenocarcinoma[J]. Translational Oncology, 2021, 14(8): 101123.
2.Jurmeister P, Schöler A, Arnold A, et al. DNA methylation profiling reliably distinguishes pulmonary enteric adenocarcinoma from metastatic colorectal cancer[J]. Modern Pathology, 2019, 32(6): 855-865.
3.Chen M, Liu P, Yan F, et al. Distinctive features of immunostaining and mutational load in primary pulmonary enteric adenocarcinoma: implications for differential diagnosis and immunotherapy[J]. Journal of Translational Medicine, 2018, 16: 1-9.
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