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In situ breast carcinomas: A population-based study on frequency, growth pattern, and clinical aspects

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Abstract

This study comprises 78 consecutive women, within situ carcinoma of the breast and no evidence of invasion, who were diagnosed and treated surgically from October, 1979 to June, 1986. Lobular carcinoma in situ (LCIS) was found in 30 patients (38%) and ductal carcinoma in situ (DCIS) was identified in 48 patients (62%). The series is a study based in the county of Funen, which has a total female population of 230,028 inhabitants.

Epidemiological calculations were carried out in 5 municipalities in the area of Odense University Hospital with 77,477 female inhabitants 20+ years of age according to a predetermined referral scheme and diagnostic procedures. This sub-study revealed a frequency of 9.0 cases ofin situ carcinomas per 105 woman-years and a cumulated risk of 0.53% of havingin situ carcinoma demonstrated within the age range of 20–75 years.In situ lesions made up about 6% of all newly diagnosed breast carcinomas in the region. Furthermore, in about 3% of all breast biopsies and in about 0.3% of all women having mammography due to breast symptoms, anin situ finding was the only malignant change.

Pathoanatomically, a distinction could be made between 3 different growth patterns: microfocal, tumor-forming, and diffuse growths. Microfocal lesions comprised a major part (60%) of in situ carcinomas. With one exception, the microfocal cases were chance findings in an otherwise benign breast biopsy, whereas the more aggressive growth patterns (tumor-forming and diffuse) were predominantly clinical and/or mammographic findings, all belonging to the DCIS type. Excisional biopsy or partial mastectomy was performed in 85% of the women with microfocal cases, while such breast preservation procedures were used in only 27% of patients with tumor-forming or diffuse growths.

Résumé

On a étudié les résultats de soixante-dix-huit cancersin situ du sein chez la femme, sans évidence d'envahissement, diagnostiqué et traités chirurgicalement entre octobre 1979 et juin 1986. Il y avait 30 cas (38%) de cancer lobulaire (CL) et 48 cas (62%) de cancer cannalaire (CC). Cette série de patientes provenait du comté de Funen, Danemark, dont la population féminine est de 230,028.

L'épidémiologie a été étudiée dans 5 municipalités dans la région de l'Hôpital Universitaire d'Odense où la population féminine est de 77,477 selon une méthode de consultation et de diagnostic standardisée. Cette étude a montré que l'incidence était de 9 cas de cancerin situ pour 105 femmes-années; le risque d'avoir un cancerin situ était de 0.53% entre les âges de 20–75 ans. Six pour cent des cancers diagnostiqués dans la région étaitin situ. Un cancer in situ a été trouvé dans 3% de toutes les biopsies du sein, et 0.3% des femmes ayant une mammographie motivée par une Symptomatologie au niveau du sein.

Histologiquement, on pouvait distinguer 3 types de croissance: microfocale, tumorale, et diffuse. Les lésions microfocales étaient responsables de 60% des cancersin situ. A une exception près, les microfoyers de cancer ont tous été découverts par hasard, alors que les formes tumorales et diffuses ont tous été décelés grâce à des signes cliniques et/ou mammographiques. Il s'agissait toujours d'un cancer cannalaire. Une biopsie d'exérèse ou mastectomie partielle a été effectuée chez 85% des femmes ayant un microcancer, mais seulement chez 27% des femmes ayant une forme tumorale ou diffuse.

Resumen

El presente estudio comprende 78 mujeres consecutivas con carcinoma mamarioin situ y sin evidencia de invasíon, quienes fueron diagnosticadas y tratadas quirúrgicamente durante el período 1979 a 1986. Se encontró carcinoma lobular in situ (CLIS) en 30 pacientes (38%) y carcinoma ductal in situ (CDIS) en 48 pacientes (62%). La serie proviene de la región de la isla de Funen, Dinamarca, con una población de 230,028 habitantes.

Se realizaron determinaciones epidemiológicas en 5 municipalidades correspondientes a la región del Hospital de la Universidad de Odense, con 77,477 habitantes mujeres de acuerdo a un esquema predeterminado de referencia y a procedimientos de diagnóstico estandarizados. Este subanálisis reveló una frecuencia de 9.0 casos de carcinomasin situ por 105 mujer-años y un riesgo de 0.53% de tener carcinomain situ para las mujeres entre los 20 y los 75 años. Las lesionesin situ representaron alrededor del 6% de la totalidad de los nuevos carcinomas mamarios diagnosticados en la región. Además, en alrededor de 3% de todas las biopsias mamarias y en alrededor de 0.3% de todas las mujeres sometidas a mamografía por razón de presentar síntomas mamarios, el hallazgoin situ fue el único hallazgo de malignidad.

Se pudo hacer la diferenciación anatomopatológica entre 3 diferentes patrones de crecimiento: microfocal, formación tumoral, y crecimiento difuso. Las lesiones microfocales comprenden la mayor parte (60%) de los carcinomasin situ. Con una excepción, los casos del tipo microfocal fueron hallazgos fortuitos en biopsias mamarias por lo demás benignas, en tanto que los patrones de crecimiento de tipos más agresivos (formación tumoral y crecimiento difuso) fueron predominantemente hallazgos clínicos y/o mamográficos, todos CDIS. Se realizó biopsias excisional o mastectomía parcial en 85% de las mujeres con el tipo microfocal, en tanto que tales procedimientos de conservación mamaria fueron utilizados en solo 27% de las pacientes con los patrones de formación tumoral de crecimiento difuso.

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Authors and Affiliations

  1. Departments of Surgery, Pathology, and Diagnostic Radiology, Odense University Hospital, Odense, Denmark

    M. Blichert-Toft M.D., H. P. Graversen M.D., J. Andersen M.D., U. Dyreborg M.D. & A. Green M.D.

  2. Institute of Clinical Genetics, Odense University, Odense, Denmark

    M. Blichert-Toft M.D., H. P. Graversen M.D., J. Andersen M.D., U. Dyreborg M.D. & A. Green M.D.

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  1. M. Blichert-Toft M.D.
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  2. H. P. Graversen M.D.
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  3. J. Andersen M.D.
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  4. U. Dyreborg M.D.
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  5. A. Green M.D.
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Blichert-Toft, M., Graversen, H.P., Andersen, J. et al. In situ breast carcinomas: A population-based study on frequency, growth pattern, and clinical aspects. World J. Surg. 12, 845–850 (1988). https://doi.org/10.1007/BF01655494

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