{"url":"/dataset/gbsg2","name":"GBSG2","full_name":"German Breast Cancer Study Group 2","description_markdown":"The German Breast Cancer Study Group (GBSG2) dataset studies the effects of hormone treatment on recurrence-free survival time. \r\nThe event of interest is the recurrence of cancer time. \r\nThis data frame contains the observations of 686 women:\r\n\r\n* horTh: hormonal therapy, a factor at two levels (yes and no).\r\n* age: age of the patients in years.\r\n* menostat: menopausal status, a factor at two levels pre (premenopausal) and post (postmenopausal).\r\n* tsize: tumor size (in mm).\r\n* tgrade: tumor grade, a ordered factor at levels I < II < III.\r\n* pnodes: number of positive nodes.\r\n* progrec: progesterone receptor (in fmol).\r\n* estrec: estrogen receptor (in fmol).\r\n\r\n* time: recurrence free survival time (in days).\r\n* cens: censoring indicator (0- censored, 1- event).\r\n\r\n**References**\r\n\r\n* W. Sauerbrei and P. Royston (1999). Building multivariable prognostic and diagnostic models: transformation of the predictors by using fractional polynomials. Journal of the Royal Statistics Society Series A, Volume 162(1), 71–94\r\n* M. Schumacher, G. Basert, H. Bojar, K. Huebner, M. Olschewski, W. Sauerbrei, C. Schmoor, C. Beyerle, R.L.A. Neumann and H.F. Rauschecker for the German Breast Cancer Study Group (1994), Randomized 2 × 2 trial evaluating hormonal treatment and the duration of chemotherapy in node- positive breast cancer patients. Journal of Clinical Oncology, 12, 2086–2093\r\n\r\nSource: [Lifelines](https://lifelines.readthedocs.io/en/latest/lifelines.datasets.html#lifelines.datasets.load_gbsg2)","description_withheld":null,"homepage":"","introduced_date":null,"introduced_date_note":null,"introduced_by":null,"license":null,"modalities":[],"tasks":[{"name":"Survival Analysis","url":"/task/survival-analysis","datasets_with_task":"/datasets/task/survival-analysis"},{"name":"Time-to-Event Prediction","url":"/task/time-to-event-prediction","datasets_with_task":"/datasets/task/time-to-event-prediction"}],"languages":[],"variants":["GBSG2"],"data_loaders":[],"num_papers_in_archive":5,"source":{"archive":"pwc-archive (Hugging Face), CC BY-SA 4.0","snapshot":"2025-07-28"},"benchmarks":[],"papers_with_a_benchmark_row":[],"syntology_totals":{"read_at":"2026-09-24T18:15:14+00:00","papers_with_samples":0,"samples_harvested":0,"samples_ran":0,"samples_unverified":0,"pointer_only_for_licence":0,"papers_with_no_sample_that_ran":0,"note":"the per-paper counts above, summed; not a rate"},"papers_note":"The archive never published its papers-using-dataset list; these are papers with a leaderboard row on this dataset's benchmarks."}