Mammographic Density and Prediction of Nodal Status in Breast Cancer Patients.

Abstract:

:Aim: Nodal status remains one of the most important prognostic factors in breast cancer. The cellular and molecular reasons for the spread of tumor cells to the lymph nodes are not well understood and there are only few predictors in addition to tumor size and multifocality that give an insight into additional mechanisms of lymphatic spread. Aim of our study was therefore to investigate whether breast characteristics such as mammographic density (MD) add to the predictive value of the presence of lymph node metastases in patients with primary breast cancer. Methods: In this retrospective study we analyzed primary, metastasis-free breast cancer patients from one breast center for whom data on MD and staging information were available. A total of 1831 patients were included into this study. MD was assessed as percentage MD (PMD) using a semiautomated method and two readers for every patient. Multiple logistic regression analyses with nodal status as outcome were used to investigate the predictive value of PMD in addition to age, tumor size, Ki-67, estrogen receptor (ER), progesterone receptor (PR), grading, histology, and multi-focality. Results: Multifocality, tumor size, Ki-67 and grading were relevant predictors for nodal status. Adding PMD to a prediction model which included these factors did not significantly improve the prediction of nodal status (p = 0.24, likelihood ratio test). Conclusion: Nodal status could be predicted quite well with the factors multifocality, tumor size, Ki-67 and grading. PMD does not seem to play a role in the lymphatic spread of tumor cells. It could be concluded that the amount of extracellular matrix and stromal cell content of the breast which is reflected by MD does not influence the probability of malignant breast cells spreading from the primary tumor to the lymph nodes. ZUSAMMENFASSUNG:Ziel: Der Nodalstatus ist nach wie vor einer der wichtigsten Prognosefaktoren für Patientinnen mit Mammakarzinom. Die zellulären und molekularen Gründe hierfür sind nicht gut verstanden, und es gibt nur wenige Prädiktoren außer Tumorgröße und Multifokalität, die einen zusätzlichen Einblick in die Mechanismen der lymphatischen Metastasierung geben. Ziel unserer Studie war es daher zu untersuchen, ob die mammografische Dichte (MD) als Korrelat der Stroma- und Extrazellularmatrixmenge mit dem Auftreten von Lymphknotenmetastasen korreliert. Methoden: In dieser retrospektiven Studie sind Patientinnen mit pimärem, metastasenfreien Mammakarzinom eingeschlossen wurden, die in einer Institution behandelt wurden. Von allen Patientinnen musste die MD bekannt sein, genauso wie die Staging-Informationen. Die MD wurde semiautomatisiert als prozentuale MD (PMD) von 2 unabhängigen Gutachtern beurteilt. Logistische Regressionsanalysen mit dem Nodalstatus als Zielvariable wurden durchgeführt, um den zusätzlichen prädiktiven Wert von PMD zusätzlich zu Alter, Tumorgröße, Ki-67, Östrogenrezeptorstatus (ER) und Progesteronrezeptorstatus (PR), Grading, Tumortyp und Multifokalität zu bestimmen. Ergebnisse: Multifokalität, Tumorgröße, Ki-67 und Grading waren relevante Prädiktoren des Nodalstatus. Die Hinzunahme von PMD zu diesen Faktoren konnte die Vorhersage des Nodalstatus nicht signifikant verbessern (p = 0,24, Likelihood-Ratio-Test). Schlussfolgerung: Der Nodalstatus konnte relativ gut durch die Parameter Multifokalität, Tumorgröße, Ki-67 und Grading vorhergesagt werden. PMD scheint keine Rolle zu spielen bei der Lymphknotenmetastasierung aus dem Primärtumor. Somit scheint die Menge an Extrazellularmatrix und Stroma, welche das Korrelat der MD ist, keinen Einfluss auf die Wahrscheinlichkeit zu haben, mit der Brustkrebszellen lymphatisch metastasieren.

authors

Hack CC,Häberle L,Geisler K,Schulz-Wendtland R,Hartmann A,Fasching PA,Uder M,Wachter DL,Jud SM,Loehberg CR,Lux MP,Rauh C,Beckmann MW,Heusinger K

doi

10.1055/s-0032-1328291

subject

Has Abstract

pub_date

2013-02-01 00:00:00

pages

136-141

issue

2

eissn

0016-5751

issn

1438-8804

journal_volume

73

pub_type

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