False/Negative Rate of Lung Percutaneous Needle Biopsy

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EstadoTerminado

Patrocinadores

State University of New York - Upstate Medical University

ENSAYO CLÍNICO: NCT00638352

BioSeek: nct00638352

Palabras clave

cáncer

Abstracto

Needle biopsy is a way of determining whether a lung mass is cancerous or benign. Its accuracy was established by research in which patients underwent fine needle aspiration, a kind of needle biopsy that yields samples for cytology (similar to the way a pap smear or a fluid sample would be evaluated for malignant cells). This kind of needle biopsy may supplemented or replaced by core needle biopsy, which yields samples for histology (similar to surgical tissue samples but on a smaller scale) rather than for cytology. Core needle biopsy is believed to be helpful particularly in obtaining a diagnosis in patients who have a lung mass that their doctors think is cancerous but is, in fact, benign. In spite of the advances in needle biopsy, however, there are patients who do receive a pathology report indicating no evidence of cancer but whose lung mass actually is cancerous. The fraction of such patients, among all patients who have no evidence of cancer according to the biopsy, is called the "false negative rate." It is approximately 25% for needle biopsies that consist of fine needle aspiration alone. The false negative rate for needle biopsies that include core biopsy samples is not known.

We want to examine the accuracy of needle biopsy in patients who had core samples taken from a lung mass in addition to, or in place of, fine needle aspiration. In this study we will focus on such patients who had no evidence of cancer according to the biopsy, to determine how many actually had a cancer that was missed by the biopsy. To accomplish this goal, we will need to review the medical records of these patients for one of two things: either a definitive diagnosis of the lung mass by some other means (for example, surgical biopsy), or by seeing how the patient does over a period of time (usually in conjunction with medical imaging tests such as chest x-rays or chest CT scans). To establish that a lung mass is benign by observing a patient over time, it is necessary to show that the lung mass disappears, becomes smaller, or remains unchanged in size for 2 years.

Descripción

We will review medical records to identify patients who underwent percutaneous needle biopsy of a lung mass between 5/1/01 and 10/30/04. If the pathology report indicates that the biopsy showed no evidence of malignancy, we will examine the medical record for a "gold standard" diagnosis of the lesion in question, including the pathology result from a surgical resection or a repeat biopsy, imaging follow-up demonstrating regression of the lesion or size stability for at least 2 years, or clinical follow-up for at least 2 years with no clinical evidence of malignant disease. If this information is not available in the University Hospital medical record, we will contact the patient to obtain consent for follow-up using external sources (physician records, imaging studies, pathology reports).

We will derive descriptive statistics (prevalence of malignancy, sensitivity, specificity, and false negative rates). The overall sample size will be ~500 patients who had PTNB of a lung mass within the study period. Approximately 80 are expected to have a biopsy result showing no evidence of malignancy, based on a retrospective review performed under an IRB exemption (87-04, letter dated 9/28/04). The expected proportion of cases with no evidence of malignancy is approximately 0.15. For a 95% confidence interval of 0.15+/-0.075 we will need follow-up information from 61 patients, considering that this is a descriptive study with a dichotomous variable. This gives us a margin for patients who will be lost to follow-up

fechas

Verificado por última vez:	06/30/2016
Primero enviado:	03/11/2008
Inscripción estimada enviada:	03/11/2008
Publicado por primera vez:	03/18/2008
Última actualización enviada:	07/14/2016
Última actualización publicada:	07/17/2016
Fecha de inicio real del estudio:	05/31/2006
Fecha estimada de finalización primaria:	02/28/2010
Fecha estimada de finalización del estudio:	03/31/2010

Condición o enfermedad

Lung Neoplasm

Fase

Criterio de elegibilidad

Edades elegibles para estudiar	18 Years A 18 Years
Sexos elegibles para estudiar	All
Método de muestreo	Non-Probability Sample
Acepta voluntarios saludables	si
Criterios	Inclusion Criteria: - subjects who underwent percutaneous needle biopsy of a lung mass during the study period of 5/1/01 to 10/30/04 Exclusion Criteria: - subjects will be excluded if at least one core sample was not obtained in the course of the biopsy. - subjects who had a pathology sample read as "insufficient for diagnosis" - subjects who underwent needle biopsy only for infection, to identify a causative organism

Salir

Medidas de resultado primarias

1. The primary objective is to determine the false negative rate of PTNB procedures that include core tissue samples, and to compare it to the historical false negative rate of PTNB with FNA only. [2 years]

Medidas de resultado secundarias

1. To determine the sensitivity of PTNB procedures that include at least one core tissue sample, for the diagnosis of malignancy. [2 years]