■中肾样腺癌(MLA)是最近出现的特征,罕见,和侵袭性肿瘤,主要出现在子宫体和卵巢。MLA表现出与宫颈中肾腺癌相似的特征性病理特征。MLA的起源仍然存在争议,病理学家对MLA的认识仍然具有挑战性。这项研究的目的是通过靶向下一代测序(NGS)来丰富子宫体MLA的临床病理特征,并探讨其分子改变。
■在2014年1月至2021年12月期间,在我们机构诊断的398例子宫内膜癌中发现了4例MLA。对437个癌症相关基因进行免疫组织化学和靶向NGS。
■最常见的症状是异常阴道出血,平均年龄为68岁。组织学上,肿瘤表现出多种生长模式的混合物,包括乳头状,腺体,管状,cribriform,固体,和狭缝状架构,由柱状至立方体细胞排列,囊泡核重叠,有时核槽。在四例中的三例中,管腔内嗜酸性粒细胞样分泌物明显。免疫组织化学,MLA对GATA3呈阳性(4/4),TTF-1(3/3),管腔CD10(3/3),calretinin(2/3),和斑片状P16(3/3),ER(0/4)和PR(0/4)阴性。P53的表达为“野生型”(4/4)。通过有针对性的NGS,3/4(75%)2/4(50%)1/4(25%)病例携带PIK3CA,KRAS,和PTEN突变,分别。这些肿瘤都没有DNA错配修复基因突变,ARID1A/B,POLE,CTNNB1、SMARCA4或TP53。在诊断的时候,三个呈现为FIGOIB阶段,一个呈现为IIIC阶段。2例患者接受术后化疗和放疗,随访8个月和56个月无疾病证据,分别。1例患者在手术和化疗后13个月出现肺转移,其中一人在手术后24个月无辅助治疗死亡。
■MLA是一种罕见且侵袭性的恶性肿瘤,约占所有子宫内膜癌的1%。它表现出与独特的免疫表型和复发的KRAS和PIK3CA突变相关的混合结构。支持分类为Müller起源,具有中肾分化。
UNASSIGNED: Mesonephric-like adenocarcinoma (MLA) is a recently characterized, rare, and aggressive neoplasm that mostly arises in the uterine corpus and ovary. MLA shows characteristic pathological features similar to mesonephric adenocarcinoma of the cervix. The origin of MLA is still controversial and recognition of it remains challenging for pathologists. The aim of this study was to enrich the clinicopathological features of MLA in the uterine corpus and explore its molecular alterations by targeted next-generation sequencing (NGS).
UNASSIGNED: Four cases of MLA were identified among a total of 398 endometrial carcinomas diagnosed in our institution between January 2014 and December 2021. Immunohistochemistry and targeted NGS spanning 437 cancer-relevant genes were performed.
UNASSIGNED: The most common symptom was abnormal vaginal bleeding, and the average age was 68 years. Histologically, the tumors showed a mixture of varied growth patterns including papillary, glandular, tubular, cribriform, solid, and slit-like architectures, which were lined by columnar to cuboidal cells with overlapping vesicular nuclei and sometimes nuclear grooves. Intraluminal eosinophilic colloid-like secretions were focally evident in three of the four cases. Immunohistochemically, the MLAs were positive for GATA3 (4/4), TTF-1 (3/3), luminal CD10 (3/3), calretinin (2/3), and patchy P16 (3/3) and were negative for ER (0/4) and PR (0/4). The expression of P53 was \"wild type\" (4/4). By targeted NGS, 3/4 (75%), 2/4 (50%), and 1/4 (25%) cases harbored PIK3CA, KRAS, and PTEN mutations, respectively. None of the tumors had mutations in DNA mismatch repair genes, ARID1A/B, POLE, CTNNB1, SMARCA4, or TP53. At the time of diagnosis, three were presented with FIGO IB stage and one with IIIC stage. Two patients received postoperative chemotherapy and radiotherapy and they were alive without evidence of disease at 8 and 56 months follow-up, respectively. One patient developed pulmonary metastasis 13 months after surgery and chemotherapy, and one was dead of the disease 24 months after the operation without adjuvant therapy.
UNASSIGNED: MLA is a rare and aggressive malignancy, representing approximately 1% of all endometrial carcinomas. It exhibits mixed architectures associated with distinctive immunophenotype and recurrent KRAS and PIK3CA mutations, supporting classified as of Müllerian origin with mesonephric differentiation.