Blar i St. Olavs hospital på forfatter "Valla, Marit"
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The association of women’s birth size with risk of molecular breast cancer subtypes: a cohort study
Sandvei, Marie Søfteland; Opdahl, Signe; Valla, Marit; Lagiou, Pagona; Vesterfjell, Ellen Veronika; Rise, Tor Vikan; Overrein, Tina Syvertsen; Skjervold, Anette Hansen; Engstrøm, Monica J; Bofin, Anna M.; Vatten, Lars J. (Peer reviewed; Journal article, 2021)Background: Because birth size appears to be positively associated with breast cancer risk, we have studied whether this risk may differ according to molecular breast cancer subtypes. Methods: A cohort of 22,931 women born ... -
CCND1 amplification in breast cancer -associations with proliferation, histopathological grade, molecular subtype and prognosis
Valla, Marit; Klæstad, Elise; Ytterhus, Borgny; Bofin, Anna M. (Peer reviewed; Journal article, 2022)CCND1 is located on 11q13. Increased CCND1 copy number (CN) in breast cancer (BC) is associated with high histopathological grade, high proliferation, and Luminal B subtype. In this study of CCND1 in primary BCs and ... -
DTX3 copy number increase in breast cancer: a study of associations to molecular subtype, proliferation and prognosis
Valla, Marit; Opdahl, Signe; Ytterhus, Borgny; Bofin, Anna M. (Journal article; Peer reviewed, 2021)Purpose The degree of cell proliferation is important for subclassifcation of breast cancers into prognostic and therapeutic groups. DTX3 has been identifed as a driver of proliferation in luminal breast cancer. In this ... -
FastPathology: An open-source platform for deep learning-based research and decision support in digital pathology
Pedersen, André; Valla, Marit; Bofin, Anna Mary; Perez de Frutos, Javier; Reinertsen, Ingerid; Smistad, Erik (Peer reviewed; Journal article, 2021)Deep convolutional neural networks (CNNs) are the current state-of-the-art for digital analysis of histopathological images. The large size of whole-slide microscopy images (WSIs) requires advanced memory handling to read, ... -
H2G-Net: A multi-resolution refinement approach for segmentation of breast cancer region in gigapixel histopathological images
Pedersen, André; Smistad, Erik; Rise, Tor Vikan; Dale, Vibeke Grotnes; Pettersen, Henrik P Sahlin; Nordmo, Tor-Arne Schmidt; Bouget, David Nicolas Jean-Mar; Reinertsen, Ingerid; Valla, Marit (Journal article; Peer reviewed, 2022)Over the past decades, histopathological cancer diagnostics has become more complex, and the increasing number of biopsies is a challenge for most pathology laboratories. Thus, development of automatic methods for evaluation ... -
Long term trends of breast cancer incidence according to proliferation status
Klæstad, Elise; Opdahl, Signe; Raj, Sunil Xavier; Valla, Marit; Bofin, Anna M. (Peer reviewed; Journal article, 2022)Background Long-term breast cancer incidence trends according to proliferation status are poorly described. We studied time-trends in breast cancer incidence, using mitotic count and Ki-67 as markers of proliferation. ... -
MRPS23 amplification and gene expression in breast cancer; association with proliferation and the non-basal subtypes
Klæstad, Elise; Opdahl, Signe; Engstrøm, Monica J; Ytterhus, Borgny; Wik, Elisabeth; Bofin, Anna Mary; Valla, Marit (Peer reviewed; Journal article, 2020)Purpose MRPS23 is recognized as a driver of proliferation in luminal breast cancer. The aims of the present study were to describe MRPS23 copy number change in breast cancer, and to assess associations between MRPS23 ... -
Oestrogen receptor low positive breast cancer: associations with prognosis
Skjervold, Anette Hansen; Valla, Marit; Bofin, Anna M. (Journal article; Peer reviewed, 2023)Purpose In this study of oestrogen receptor (ER) Low Positive breast cancers (BC) in three large cohorts of BC patients, we assess associations between levels of ER expression and tumour characteristics and prognosis. ... -
PAK1 copy number in breast cancer—Associations with proliferation and molecular subtypes
Skjervold, Anette Hansen; Valla, Marit; Ytterhus, Borgny; Bofin, Anna M. (Peer reviewed; Journal article, 2023)Introduction P21-activated kinase 1 (PAK1) is known to be overexpressed in several human tumour types, including breast cancer (BC). It is located on chromosome 11 (11q13.5-q14.1) and plays a significant role in proliferation ... -
Visual and digital assessment of Ki-67 in breast cancer tissue - a comparison of methods
Skjervold, Anette Hansen; Pettersen, Henrik P Sahlin; Valla, Marit; Opdahl, Signe; Bofin, Anna Mary (Peer reviewed; Journal article, 2022)Background In breast cancer (BC) Ki-67 cut-off levels, counting methods and inter- and intraobserver variation are still unresolved. To reduce inter-laboratory differences, it has been proposed that cut-off levels for ...