You will be shown an abstract from a biomedical research paper. Given this abstract, your task is to extract all unique entities of the following types: ["Disease"].

Please return the output as a JSON object of the format: {"Disease" : ["COVID-19", ...]}. The keys should be entity types and values should be lists of extracted entities belonging to the corresponding type. If you cannot find entities belonging to a specific type, the value should be [].

Only output the JSON object and do not include any additional text.

Abstract:

Dual roles of ATM in the cellular response to radiation and in cell growth control. The gene mutated in ataxia-telangiectasia (AT) patients, denoted ATM, encodes a putative protein or lipid kinase. To elucidate the functions of ATM, we disrupted the mouse ATM gene through homologous recombination in mice. Consistent with cellular defects of AT patients, the ATM-/- cells are hypersensitive to gamma-irradiation and defective in cell-cycle arrest following radiation, correlating with a defective up-regulation of p53. In addition, ATM-/- mouse thymocytes are more resistant to apoptosis induced by gamma-irradiation than normal thymocytes. ATM-/- fibroblasts are inefficient in G1 to S-phase progression following serum stimulation and senesce after only a few passages in culture. They have an increased constitutive level of p21CP1/WAF1. The ATM protein is therefore critical both for cellular responses to ionizing radiation and for normal cell-cycle progression. ATM +/- fibroblasts and thymocytes showed intermediately defective responses to irradiation but no growth defect, suggesting that the increased cancer risk of AT heterozygotes could be attributable to poor checkpoint function..
{"Disease": ["ataxia-telangiectasia", "AT", "cancer"]}