The p16-Ki-67-HMB45 Immunohistochemistry Scoring System is Highly Concordant With the Fluorescent In Situ Hybridization Test to Differentiate Between Melanocytic Nevi and Melanomas.

The treatment of melanoma requires early diagnosis and extensive surgical removal of the primary tumor. The differential diagnosis between a melanoma and a nevus is sometimes difficult from a histopathologic point of view and could require ancillary diagnostic tools. Recently, both fluorescent in situ hybridization (FISH) and p16-Ki67-HMB45 combined immunohistochemistry have been proposed as examples of ancillary diagnostic methods to help classify melanocytic tumors as benign or malignant. In this study, we compare FISH and p16-Ki-67-HMB45 immunohistochemistry in a set of melanomas and nevi. A total of 101 formalin-fixed and paraffin-embedded tumor samples (44 melanomas and 57 nevi) were analyzed using FISH for chromosomes 6, 8, 9, and 11 and p16-Ki-67-HMB45 immunohistochemistry. Any chromosomal imbalances and/or a p16-Ki-67-HMB45 immunohistochemistry combined score of 4 or higher were considered to reflect a "favor" malignant tumor. Using FISH, 42 out of 44 melanomas presented at least 1 chromosomal imbalance, whereas 2 melanomas and all nevi did not. Each melanoma, including 6 challenging tumors, had a p16-Ki-67-HMB45 immunohistochemistry combined score of 4 or higher and every nevus had a score inferior to 4. This reflects an excellent strength of agreement between FISH, immunohistochemistry, and definitive histopathologic diagnosis in our tumor set. We conclude that both FISH and p16-Ki67-HMB45 combined immunohistochemistry are valuable ancillary diagnostic tools to help pathologists classify melanocytic tumors as nevi or melanomas.

Acute myeloid leukaemia (FAB AML-M4Eo) with cryptic insertion of cbfb resulting in cbfb-Myh11 fusion.

Inv(16)(p13q22) and t(16;16)(p13;q22) are cytogenetic hallmarks of acute myelomonoblastic leukaemia, most of them associated with abnormal bone marrow eosinophils [acute myeloid leukaemia French-American-British classification M4 with eosinophilia (FAB AML-M4Eo)] and a relatively favourable clinical course. They generate a 5'CBFB-3'MYH11 fusion gene. However, in a few cases, although RT-PCR identified a CBFB-MYH11 transcript, normal karyotype and/or fluorescent in situ hybridization (FISH) analyses using commercially available probes are found. We identified a 32-year-old woman with AML-M4Eo and normal karyotype and FISH results. Using two libraries of Bacterial Artificial Chromosome clones on 16p13 and 16q22, FISH analyses identified an insertion of 16q22 material in band 16p13, generating a CBFB-MYH11 type A transcript. Although very rare, insertions should be searched for in patients with discordant cytological and cytogenetic features because of the therapeutic consequences. Copyright © 2015 John Wiley & Sons, Ltd.

Asbestos-related lung cancers: A retrospective clinical and pathological study.

Exposure to asbestos results in serious risks of developing mesothelioma and lung cancer. The link between asbestos exposure and lung carcinoma is well established. Nevertheless, precise histopathological data are poorly considered when investigating the asbestos-cancer link in a compensatory approach. In the present study, we aim to describe the features of individuals with compensated lung cancer who were referred to an occupational disease center, regarding occupational exposure to asbestos, smoking history and pathological data. We led a retrospective study of compensated ARLC cases seen in our occupational disease center between 2003 and 2013. A total of 146 men were included (mean age at diagnosis, 63.2 years) of whom approximately 90% were heavy current or former smokers (mean value, 30.4 packs/year). The major industries associated with the lung cancer cases were shipbuilding (69.9%), and building construction (7.5%) in this harbor region. The results of the present study showed that lung upper lobe was most prevalent (61.6%) and an excess of adenocarcinoma was found (45.9%), followed by squamous cell carcinoma (38.4%) as well as thoracic sarcomas (2.1%). Neoplasm was not histologically proven in 6.8% of the cases. Subsequent pathology examinations also reclassified 2 tumors as metastases from esophageal and laryngeal origins. In conclusion, smoking prevention should be encouraged in asbestos-exposed workers as reflected by the number of smokers with asbestos-related lung cancer. Thus, histological data should be considered further to evaluate the potent relationship between asbestos exposure and lung malignancy, especially in a compensatory approach.

Prognostic impact of p15 gene aberrations in acute leukemia.

The p15 gene (also known as CDKN2B, INK4B, p15INK4B), located in band 9p21, encodes a protein that induces a G1-phase cell cycle arrest through inhibition of CDK4/6 (cyclin-dependent kinase 4/6). It also plays an important role in the regulation of cellular commitment of hematopoietic progenitor cells and myeloid cell differentiation. p15 can be silenced by several mechanisms, including deletion and hypermethylation of its promoter. Homozygous p15 deletion is rare in acute myeloblastic leukemia (AML) and myelodysplastic syndromes (MDS) but frequent in acute lymphoblastic leukemia (ALL). On the contrary, methylation of the p15 promoter is identified in some 50% of the patients with AML and MDS, but is less frequent in ALL. The analysis of the 28 studies available in the literature revealed conflicting results (unfavorable, favorable or no impact) that can be due, at least in part, to methodological and/or biological pitfalls. Among those, are the heterogeneity of the methylation patterns of the p15 gene and the lack of a comprehensive analysis including transcriptional and translational inactivation that have major impact on its expression. Therefore, detection of the p15 mRNA expression (quantitative or not) may represent a more appropriate method to determine the prognostic impact of the p15 gene.

False ALK Rearrangement Signals in Inflammatory Cells: A Pitfall in the Interpretation of ALK Fluorescence In Situ Hybridization in Non-Small Cell Lung Cancer.

Searching for ALK rearrangements has now become mandatory for the treatment of patients with advanced non-small cell lung cancer with anti-ALK-targeted therapy. The fluorescence in situ hybridization test is considered the "gold standard" to diagnose ALK-rearranged tumors. Nevertheless, some technical pitfalls may cause false-positive signals mimicking ALK rearrangements. In this technical article, we point out the importance of taking into account both histopathologic and ALK immunohistochemical features to interpret ALK fluorescence in situ hybridization analyses in inflammatory and necrotic tumors. This confrontation is crucial to avoid misdiagnosis and inappropriate therapeutic management.

Fluorescence in situ hybridization testing of chromosomes 6, 8, 9 and 11 in melanocytic tumors is difficult to automate and reveals tumor heterogeneity in melanomas.

Malignant melanomas may be difficult to differentiate from benign nevi on the basis of histology. Contrary to nevi, the majority of melanomas harbor chromosomal imbalances. Comparative genomic hybridization-based and fluorescence in situ hybridization (FISH) tests can help differentiating malignant from benign tumors. In the present study, eight-bacterial artificial chromosome (BAC) probes targeting chromosomes 6, 8, 9 and 11 were tested by FISH, and compared with a commercial four-color FISH probe set targeting chromosomes 6 and 11 in a first set of 62 tissue microarray-included melanocytic tumors (47 melanomas and 15 nevi). A second set of 108 tumors (70 melanomas and 38 nevi) was analyzed with the eight-probes kit, and manual counting was compared with the newly developed automated FISH signals counting and with semi-quantitative visual detection of chromosomal imbalances. Intra-tumor heterogeneity was also evaluated in 12 melanomas and 10 patients with paired melanoma samples. Testing the tumors from the first set with the commercial kit and the eight-probes test permitted to correctly identify 45/47 and 47/47 melanomas, respectively. In the second tumor set, 65/70 malignant tumors presented at least one chromosomal imbalance, whereas none was detected in the nevi. The agreement between manual and automated signals counting was better in good-quality FISH slides compared with poor-quality slides. Semi-quantitative visual appreciation of chromosomal imbalances also reached strong agreement with exact manual counting. In addition, a frequent cytogenetic heterogeneity within melanomas and between paired tumors was noticed in patients with metastatic melanomas. To conclude, FISH testing targeting chromosomes 6, 8, 9 and 11 enabled to differentiate the majority of melanomas from nevi but was difficult to automate. Tumor cytogenetic heterogeneity was frequent and could impair FISH testing.

ALK ambiguous-positive non-small cell lung cancers are tumors challenged by diagnostic and therapeutic issues.

Searching for ALK rearrangements using the approved fluorescent in situ hybridization (FISH) test and complementary immunohistochemistry (IHC) has become the rule to treat patients with advanced non­small cell lung cancer (NSCLC) with anti­ALK targeted therapy. The concordance between the two techniques is reported to be strong but imperfect. We report our experience with cases of ALK­rearranged lung adenocarcinomas pointing out particularly ambiguous cases. FISH and IHC data on ALK but also c­MET IHC as well as EGFR and KRAS mutation screening are considered, together with response to crizotinib treatment. We classified the 55 FISH ALK­rearranged tumors into two groups according to the FISH and IHC results: a concordant FISH+IHC+ group (31 tumors) and an ambiguous group (24 tumors). These tumors were considered as 'ambiguous' ALK­positive due to negative (21 tumors) or non­contributive (3 tumors) IHC. In addition, the percentage of FISH-positive nuclei was between 15 and 20% in 17 tumors belonging to one or the other group (now called borderline tumors). We discuss the accuracy of the different tests with intent to determine whether ambiguous and borderline tumors are real positive ALK­rearranged tumors. To conclude, ambiguous ALK­positive lung cancers are challenging tumors with diagnosis and therapeutic issues that can justify parallel FISH, IHC and molecular screening strategy.

ROS1 fusions in cancer: a review.

The ROS1 gene belongs to the sevenless subfamily of tyrosine kinase insulin receptor genes. A literature review identified a ROS1 fusion in 2.54% of the patients with lung adenocarcinoma and even higher frequencies in spitzoid neoplasms and inflammatory myofibroblastic tumors. At present, 26 genes were found to fuse with ROS1, some of them already known to fuse with RET and ALK. All the fusion proteins retain the ROS1 kinase domain, but rarely its transmembrane domain. Most of the partners have dimerization domains that are retained in the fusion, presumably leading to constitutive ROS1 tyrosine kinase activation. Some partners have transmembrane domains that are retained or not in the chimeric proteins. Therefore, different ROS1 fusions have distinct subcellular localization, suggesting that they may activate different substrates in vivo.

Immunoglobulin gene translocations in chronic lymphocytic leukemia: A report of 35 patients and review of the literature.

Chronic lymphocytic leukemia (CLL) represents the most common hematological malignancy in Western countries, with a highly heterogeneous clinical course and prognosis. Translocations involving the immunoglobulin (IG) genes are regularly identified. From 2000 to 2014, we identified an IG gene translocation in 18 of the 396 patients investigated at diagnosis (4.6%) and in 17 of the 275 analyzed during follow-up (6.2%). A total of 4 patients in whom the IG translocation was identified at follow-up did not carry the translocation at diagnosis. The IG heavy locus (IGH) was involved in 27 translocations (77.1%), the IG κ locus (IGK) in 1 (2.9%) and the IG λ locus (IGL) in 7 (20.0%). The chromosome band partners of the IG translocations were 18q21 in 16 cases (45.7%), 11q13 and 19q13 in 4 cases each (11.4% each), 8q24 in 3 cases (8.6%), 7q21 in 2 cases (5.7%), whereas 6 other bands were involved once (2.9% each). At present, 35 partner chromosomal bands have been described, but the partner gene has solely been identified in 10 translocations. CLL associated with IG gene translocations is characterized by atypical cell morphology, including plasmacytoid characteristics, and the propensity of being enriched in prolymphocytes. The IG heavy chain variable region (IGHV) mutational status varies between translocations, those with unmutated IGHV presumably involving cells at an earlier stage of B-cell lineage. All the partner genes thus far identified are involved in the control of cell proliferation and/or apoptosis. The translocated partner gene becomes transcriptionally deregulated as a consequence of its transposition into the IG locus. With the exception of t(14;18)(q32;q21) and its variants, prognosis appears to be poor for the other translocations. Therefore, searching for translocations involving not only IGH, but also IGL and IGK, by banding and molecular cytogenetics is required. Furthermore, it is important to identify the partner gene to ensure the patients receive the optimal treatment.

Challenges in ovarian stimulation.

In 2016, ovarian stimulation faces two main challenges: how to obtain good quality oocytes while not endangering the patients treated, but also limited by maternal age and poor ovarian responders (POR). The first IVF birth, Louise Brown, was obtained from a natural cycle. With the introduction, in the 1980s of gonadotropin releasing hormone agonists (GnRHa) and in the 2000s of GnRH antagonists (GnRHant), stimulation became plurifollicular (and source of consequences). Today, only about 50% of the transferred blastocysts after IVF lead to a pregnancy. The purpose of this review was to describe the current challenges and limits of ovarian stimulation.