Cytofluorimetric and immunohistochemical comparison for detecting bone marrow infiltration in non-Hodgkin lymphomas: a study of 354 patients.

Morphological and immunohistochemical (IHC) analysis of bone marrow biopsies (BMB) is routinely performed during staging of patients with non-Hodgkin's lymphoma (NHL). Aiming to evaluate the possible diagnostic value of flow cytometry (FC) on bone marrow aspirates (BMA), as compared with BMB, we retrospectively reviewed BMA specimen of 354 NHL. In 305 cases (86.1 %), there was a concordance between the two investigations. A discordance was detected in 49 cases (14 %): in 33 of these (9.3 % of total population), FC analysis of BMA was positive, whereas BMB, supported by IHC, was negative; in 16 (4.5 % of total population), FC did not detected lymphoid infiltration, while BMB was positive. Although the clinical implications of such an observation remain unclear, we think our results may be useful in the context of current staging procedures, also opening a possible future perspective in the setting of minimal measurable disease in these patients.

ALK rearrangement in specific subtypes of lung adenocarcinoma: immunophenotypic and morphological features.

Lung adenocarcinomas are characterized by a variety of genetic and epigenetic changes that lead to activation of specific signaling pathways. This allowed the classification of lung adenocarcinomas according to genetic alterations and the clinical development of novel anticancer agents that affect the activity of specific oncoproteins. In such a context, chromosomal rearrangements that cause constitutive activation of ALK gene define a category of lung adenocarcinomas that is amenable to targeted therapy with ALK inhibitors. Thus, a major issue of current research is to define the morphological and immunophenotypic features of lung ALK-rearranged adenocarcinomas to improve the selection of tumors suitable for molecular genotyping. ALK status was determined, by immunohistochemistry and fluorescence in situ hybridization, in 94 surgically resected lung adenocarcinomas and correlated with histomorphological parameters. Indeed, ALK rearrangement was observed in 10/94 (11%) lung adenocarcinomas and enriched in tumors with a predominant mucinous (46%; p < 0.05) and solid (29%; p < 0.05) pattern. By contrast, it was lacking or sporadically observed in lung adenocarcinomas with predominant acinar, papillary or lepidic pattern. Moreover, the presence of signet-ring cells was predominantly observed in ALK-rearranged tumors (47%; p < 0.05). These data suggest that ALK rearrangement is associated with specific and distinct clinical-pathological characters compared to other genotypes. Thus, the knowledge of these characteristics can improve the diagnostic accuracy and lead to a better understanding of the behavior of ALK-rearranged NSCLC.

Primary vulvar nocardiosis.

BACKGROUND: Nocardiosis is an uncommon disease, and the primary skin infection is usually at the site of a recent injury. Nocardia is a saprophytic bacterium of the soil belonging to the order Actinomycetales. CASE: A 68-year-old woman presented with a painful, hard, dark reddish lesion located in the right hemivulva. She had been treated by radiotherapy for a vulvar leiomyosarcoma arising from the left Bartholin gland at the age of 45. Pathology results demonstrated nocardial infection, initially advanced despite antibiotic therapy. The necrosis extended to and involved the ischiopubic bone, requiring extensive surgical treatment. We performed a radical vulvectomy with partial pubic bone excision to remove the necrotic tissue. A transverse gracilis-myocutaneous free flap was used for vulvar reconstruction. Wound necrosis recurrence required a rectus abdominis myocutaneous flap reconstruction, with an excellent final result. CONCLUSION: This is the first report of primary vulvar nocardiosis. This infection may simulate advanced vulvar carcinoma requiring extensive surgical treatment.