title: Lung cancer with spontaneous regression of primary and metastatic sites: A case report.
abstract: Partial or complete spontaneous cancer regression is a rare phenomenon, particularly in patients with lung cancer. This is the case report of a patient with lung cancer who exhibited spontaneous regression of the primary as well as metastatic lesions, without receiving any treatment. Spontaneous regression commenced within a week of obtaining pathological specimens by transbronchial and percutaneous biopsies from the primary lesion and metastatic lymph nodes of the left side of the neck. The reason for this phenomenon is unknown; however, we hypothesized that there may be an immunological association between the stimulus of the biopsies and the spontaneous regression. This patient should be closely followed up to monitor the clinical course of this unusual case.
authors.affiliation: Division of Respiratory Medicine, Faculty of Medicine, University of Tsukuba, Mito, Ibaraki 310-0015, Japan.
authors.forename: Ryoko
authors.initials: R
authors.lastname: Ogawa
authors.affiliation: Division of Respiratory Medicine, Faculty of Medicine, University of Tsukuba, Mito, Ibaraki 310-0015, Japan.
authors.forename: Hiroko
authors.initials: H
authors.lastname: Watanabe
authors.affiliation: Division of Respiratory Medicine, Faculty of Medicine, University of Tsukuba, Mito, Ibaraki 310-0015, Japan.
authors.forename: Kai
authors.initials: K
authors.lastname: Yazaki
authors.affiliation: Division of Respiratory Medicine, Faculty of Medicine, University of Tsukuba, Mito, Ibaraki 310-0015, Japan.
authors.forename: Kazutaka
authors.initials: K
authors.lastname: Fujita
authors.affiliation: Division of Respiratory Medicine, Faculty of Medicine, University of Tsukuba, Mito, Ibaraki 310-0015, Japan.
authors.forename: Yoshiya
authors.initials: Y
authors.lastname: Tsunoda
authors.affiliation: Division of Respiratory Medicine, Faculty of Medicine, University of Tsukuba, Mito, Ibaraki 310-0015, Japan.
authors.forename: Kensuke
authors.initials: K
authors.lastname: Nakazawa
authors.affiliation: Division of Respiratory Medicine, Faculty of Medicine, University of Tsukuba, Mito, Ibaraki 310-0015, Japan.
authors.forename: Shinsuke
authors.initials: S
authors.lastname: Homma
authors.affiliation: Division of Respiratory Medicine, Mito Medical Center, University of Tsukuba, Mito, Ibaraki 310-0015, Japan.
authors.forename: Katsunori
authors.initials: K
authors.lastname: Kagohashi
authors.affiliation: Division of Respiratory Medicine, Mito Medical Center, University of Tsukuba, Mito, Ibaraki 310-0015, Japan.
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Satoh
authors.affiliation: Division of Respiratory Medicine, Faculty of Medicine, University of Tsukuba, Mito, Ibaraki 310-0015, Japan.
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Hizawa
keywords: lung cancer; metastasis; primary tumor; spontaneous regression