CT-texture analysis of subsolid nodules for differentiating invasive from in-situ and minimally invasive lung adenocarcinoma subtypes

PURPOSE

The purpose of this study was to evaluate the usefulness of computed tomography-texture analysis (CTTA) in differentiating between in-situ and minimally-invasive from invasive adenocarcinomas in subsolid lung nodules (SSLNs).

MATERIAL AND METHODS

Two radiologists retrospectively reviewed 49 SSLNs in 44 patients. There were 27 men and 17 women with a mean age of 63±7 (SD) years (range: 47-78years). For each SSLN, type (pure ground-glass or part-solid) was assessed by consensus and CTTA was conducted independently by each observer using a filtration-histogram technique. Different filters were used before histogram quantification: no filtration, fine, medium and coarse, followed by histogram quantification using mean intensity, standard deviation (SD), entropy, mean positive pixels (MPP), skewness and kurtosis.

RESULTS

We analyzed 13 pure ground-glass and 36 part-solid nodules corresponding to 16 adenocarcinomas in-situ (AIS), 5 minimally invasive adenocarcinomas (MIA) and 28 invasive adenocarcinomas (IVA). At uni- and multivariate analysis CTTA allowed discriminating between IVAs and AIS/MIA (P<0.05 and P=0.025, respectively) with the following histogram parameters: skewness using fine textures and kurtosis using coarse filtration for pure ground-glass nodules, and SD without filtration for part-solid nodules.

CONCLUSION

CTTA has the potential to differentiate AIS and MIA from IVA among SSLNs. However, our results require further validation on a larger cohort.

Lung adenocarcinomas: correlation of computed tomography and pathology findings

Adenocarcinoma is the most common histologic type of lung cancer. Recent lung adenocarcinoma classifications from the International Association for the Study of Lung cancer, the American Thoracic Society and the European Respiratory Society (IASLC/ETS/ERS, 2011) and World Health Organization (WHO, 2015) define a wide range of adenocarcinoma types and subtypes featuring different prognosis and management. This spectrum of lesions translates into various CT presentations and features, which generally show good correlation with histopathology, stressing the key role of the radiologist in the diagnosis and management of those patients. This review aims at helping radiologists to understand the basics of the up-to-date adenocarcinoma pathological classifications, radio-pathological correlations and how to use them in the clinical setting, as well as other imaging-related correlations (radiogenomics, quantitative analysis, PET-CT).

Personalized chemotherapy of lung cancer: What the radiologist should know

Lung cancer is the leading cause of deaths due to cancer in France. More than half of lung cancers are discovered at an advanced-stage. New anticancer treatment strategies (i.e., the so-called personalized or targeted therapy) have recently been introduced and validated for non-small-cell lung cancer (NSCLC), in addition to or in association with standard chemotherapy. Personalized therapy includes tyrosine kinase inhibitors (TKIs), antiangiogenic treatments and immunotherapy. Because these treatments may be responsible for atypical thoracic adverse effects and responses as compared to standard chemotherapy, RECIST 1.1 criteria may be inadequate to evaluate the responses to these agents. The goal of this article was to review personalized treatment strategies for NSCLC, to consider the therapy-specific responses and thoracic complications induced by these new therapeutic agents and finally to discuss future directions for the personalized assessment of tumor response.

[Phenotypes of essential arterial hypertension in Caribbean women]

The characterisation of phenotypes of patients with essential hypertension (EH) is an important pre-requisite for genetic research. The present study compares clinical and renal function parameters in 2 groups of patients from different origins.

METHOD

Out of a cohort of essential hypertensives disclosed on routine work medical examinations, 21 caucasian (CC) women were paired with 21 Caribbean (CB) women. In the 2 groups we recorded family history of hypertension (FHH), duration of hypertension, BMI, salt intake based on 24 h urinary sodium excretion, microalbuminuria, and blood pressure (BP). Glomerular filtration rate (GFR) and renal plasma flow (RPF) were measured with inulin and para-amino-hippuric acid clearances. Plasma active renin (AR) and aldosterone (Aldo) levels were measured by immuno-assays. White coat (WC) effect was assessed on the difference between BP values measured on medical visits and by the nurses on clearance measurements. Anova and t-test were used for analysis, statistical significance was assumed for p < 0.05.

RESULTS

Casual BP values were 150/94 mmHg in CB and 153/95 mmHg in CC. There were no significant differences on BMI (CB 30.6 kg/m2 vs CC 27.1 kg/m2). AR (CB 6.6 pg/mL vs CC 8.7 pg/mL) and Aldo (CB 195.1 pmol/L vs CC 202.8 pmol/L) provided an equivalent dietary salt intake (CB 11.2 g/d vs CC 10.7 g/d). Mother FHH was found predominantly in CB women (60% vs 30% in CC, p < 0.05), whereas paternal FHH was more frequent in CC women (21% vs 8% in CB, p < 0.05). At the same age, duration of hypertension was longer by 1 year in CB. White coat effect was more marked in CC (BP > 30 mmHg: 40% in CC vs 5% in CB, p < 0.05). GFR values were normal and similar in CB and CC women. But a significantly lower RPF was measured in CB (489 vs 542 mL/min/1.73 m2 in CC, p < 0.05). Higher filtration fraction and microalbuminuria were also observed in CB women.

CONCLUSION

Essential hypertension occurs at younger ages in Caribbean women. The decrease in RPF could be genetically determined and is likely to participate in early onset of hypertension, as previously described in young normotensive subjects. In paired women, we did not found significant differences in active renin and aldosterone levels. The ongoing longitudinal study should contribute to assess the consequences of these findings on renal prognosis and the effects of antihypertensive therapy.