CINXE.COM

<!DOCTYPE html><html lang="en-US"><head><title>Just a moment...</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=Edge"><meta name="robots" content="noindex,nofollow"><meta name="viewport" content="width=device-width,initial-scale=1"><style>*{box-sizing:border-box;margin:0;padding:0}html{line-height:1.15;-webkit-text-size-adjust:100%;color:#313131;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol,Noto Color Emoji}body{display:flex;flex-direction:column;height:100vh;min-height:100vh}.main-content{margin:8rem auto;max-width:60rem;padding-left:1.5rem}@media (width <= 720px){.main-content{margin-top:4rem}}.h2{font-size:1.5rem;font-weight:500;line-height:2.25rem}@media (width <= 720px){.h2{font-size:1.25rem;line-height:1.5rem}}#challenge-error-text{background-image:url(data:image/svg+xml;base64,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);background-repeat:no-repeat;background-size:contain;padding-left:34px}@media (prefers-color-scheme:dark){body{background-color:#222;color:#d9d9d9}}</style><meta http-equiv="refresh" content="120"></head><body class="no-js"><div class="main-wrapper" role="main"><div class="main-content"><noscript><div class="h2"><span id="challenge-error-text">Enable JavaScript and cookies to continue</span></div></noscript></div></div><script>(function(){window._cf_chl_opt={cvId: '3',cZone: "publications.waset.org",cType: 'non-interactive',cRay: '9135fe3bcee83dad',cH: 'IxTU71fFSRODlUcTPBxwTlRtLcJjRCYofRnDc9gs5H8-1739797569-1.2.1.1-6rZCKdP40mDRE2jH94DPBEZn2JaKMxyJsAQbt2moUvv6CrC4VBbbjeaXaiYcrLXa',cUPMDTk: "\/abstracts\/search?q=spontaneous%20tumors&__cf_chl_tk=C2OqJV8vSPlE7C98Ed2h9L8oVDxNx48F6LzJd9ni6qg-1739797569-1.0.1.1-Myd8elVuvnFUWK.m7DD2FJkSNE5eOngRN1noM.c.ZLQ",cFPWv: 'b',cITimeS: '1739797569',cTTimeMs: '1000',cMTimeMs: '120000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/abstracts\/search?q=spontaneous%20tumors&__cf_chl_f_tk=C2OqJV8vSPlE7C98Ed2h9L8oVDxNx48F6LzJd9ni6qg-1739797569-1.0.1.1-Myd8elVuvnFUWK.m7DD2FJkSNE5eOngRN1noM.c.ZLQ",md: "1ag6T7KfEj_udQyrcvziwTjnDY6VOLrBxgf78QW.XfM-1739797569-1.2.1.1-9OFWzwg2j99SeK8apWJBHg9HkcUN33V._RNIuBgb4d4Akw4aaBPyCTIpLg8.yA1I1Kb1qIz3n8g7Uqf2Usi42C_VZJUNLXgt3muUC0B67n3UQdc4N8zKSeAyNLu2djk1ApI5KCbs4SL5dMZ5VktkTh1RaIfc1tBf0w5ZbSnWzesOojZsi3J6QF4QL4GoV5xYovWjY2HooCS_G7qDR5BzamJvYcJSqbsNAJj1vKBRwOofBGPh5ecsecZ1vMXlrULnNSyOB453._IIWBVnDLOJStKPSEgBXXt6dzQ4QpMelhzjqHaQeAYbHZwJviKEFcQJDxEdVXaGJh.BP355piKP6Vqa80OkbuEGYtRuIxjjqo4ZmN.guivRP4gt6rAAn5eZxswnfu7JnSZB22Foj_eQFonDOSujdzb9wmtjh9n_hPHkXXsimTtq.TQU.jqr1htmULkLewwJ7cKLWZGWAqKDMXAla07apeNN5FVX0sR5c.BLZo9M4HOLrJBNt6KItwGxSuT971SE4BWLnesXJ_MZxvBTUk8KcdzI_YTNuo475GH36vjshbahd67xDh4zB5KiwfVq5ecmv4Vj6jjELEw4RcCu1o9UuPgxLKT61OSxqdBGwHwSQpBPk8mrx6.jMArVH61CuDJhSG76Jm7uQnWGQPQSd1riFhAzVGjr0MA5.eFaGKgHwcz5aiL8zaKoAYtJlxbqwg740Z5CmricR1zN.JcUq1qWzBDJaxgPMzKRHOzMrvcw4eneIBb2HE5p9PxuL5RMaH2gclx51tRCaA9fB5TDcV8ZFbYIUJ2EUcsh1Jdb0C53DrrXt1vNrQfW0VIQ4IBGks6DJ3dzMR2meqYXOxy476fqOg1CX2yziFE_hITUVdxTtJTeaan.IWF_Dy_DlfKhexDthieGtGRcZfkAoib0aJIBvTyXcIlg_KMmBcWjltQx2JVuhILQ20UEC9FoV1N2oFdWL5qNqejLkBg1BA.DcCJqkMBmS3_t6tLw2at6Y4LBlqJswSsIuDXSSRPkInQjbS1DMUs.HDK6sZyIxGEEEPtI7PWANMhrrFsCNkOjduRlbt7j2JEQ7lwl1R3zUOpYJkc6W1AVwKpx1VZ90E6yC9g5p4wjMvuLUX4ZXgX4l8l0vJYm0iD0p6JXfDUvF3RVOuu3Pd45cy3WUEQapD4A1CryudCI5_8.YOnVTBG6d_hLJfdpNpexogCXAhwd7qVCYlLFVyZJrdF3Zv9bM_kOpq74FfNucB_Myr9peCHNtjIgj__w_o2E30mHPiLKG2ZLDamQOynVNP.muTysF_boWduC.QNGkNDnLNpIob5ZaRIuVIb7aPccnsYdjcln0f2KxX8u5mNF_Hf359y.648FjjWGtDleNFMzMkspQ8BeZyZ2UsEVMMpcGLK7TrYpAgpCYkMBYCBWbiuW9V2ZpJf9JxyHhOx1qrgxVgQUKZH636wS380nIuHsRNCE_Da55YL8s9TLUYNJds99Ee6Ae68_cLof1DAgu2W7rfI8fHq.kYDYhPqHpGK17EyaqQA0nukK3RqOZzq7WYFGpVBq8weA9PQoldMMVVfvNEELE3WUzYSPHyhEXj8ZeUH5ludXE.PPO1OUmlRFUB91PX3fosppt7hrG1mYEulx_gPwrB.89HnhCXEijuuafVciDlBwQdzMCzjJdziNMu2eoEBhGXich46OoQPgViRPVNGJMDWkAWkdIWvmiqsL8YFjRnuXJCNQRNGgmZfX2YMl0qeQesQKfK.yQX5DKcrd2j8O8PFPozRrLq7Ab88KUNqQH5jhoDzRIWWdZX6jjyD5tp5cdMrzZIAZEFYGEmxVd7h9y8n.TM0oZqguJK1Z5RPphVFckEuO5MPZFQoyAnXi9xuF__WNd2iJl250q6zlFna0tqRz8nV5F.RaGl9jAgkR9FOgCJBmE0l.Kkdlylr7a81sz9z31SO4zZPT6sQ6erp8utM",mdrd: "XmQpLcOsT4CrLLrISb2OgSphfCqBLrE7Pbt9bUluHQI-1739797569-1.2.1.1-p56qXVCL.nSVLyf5Ln8DK2ps8jp8P4Rwws7hqHB6vUkNRsWQeU0RzqB6JvS8ezP6eS5JWlFOJqLp5pjhAZm1vpvUIM1P4_nOOXGyKx8_46ZPo5x3b.HJqZKM9L3xGCuZtZp09Gcb8jb265gd8cpy7UggSNbEgHztfSQSMrBgBWJuNg.9s9qQ8hVcfq7xj3Fi8mlUFYlzrPR98tkW7bXJ7_vGl9MKgvv3rSgaoizXHt67kLY7F1uHl0nYP5ikA_WltoKgAUzNu9QPZGQHYrbBDWCTrbZ.Se5qu9QAHx86VkWzBtKw2QIlgNplk1LzyUnHGCqtb07rvysFn8ZNb2LGwlq7jbiYLmADbh81G6QDJO1U_zdXsNJqZflQIuVJboz_jS7Bd7hDmqBVOEkY8XFlMkU9OcD3vSDJuZ5sx2K4YsfNvfpE_vRulhEfWIb54k4OMEQxxeCmB9M5wQgX42774vnJMRoWGhDwqxBV2ZmoEDbv3EMTQ2rhDrjjsYP9XG9sDT7bQ8kooB7LtjjcIdH6LKj9a7ZKLZUuGtmwXMog7Iy9w3vf7PKpyYou9cfcn4GJhX_CoLrP2TvjQQKGkN.fL3W8j0q6al8g.7xteXRJYv7Hi5yHjOlWh4FTtsHK8nPeipimUF5_OKg6gAj1ztJFheLuP5eBdc50Tjh019BaudTLEjRbO9n0tWMPzForFiwnD7Cq8dPYObRzxS5Gopfx94JTVtis5rdoib_DeFSiMopNIeb4ZFLh.vHbdJmgFVD5y9EDwSK7ygl9MopR9j1y..d7DBqa5bYJDWEgAiz1cWfQZI.cKQnGisuc252wRI4jkmtJeLSYFa7qSD3IroVBCilcKU3TJZ9902Ev_gN_CX3mljScYnXjcf9qh2L3BMlfp6QDrm2yN2AL.Tg5M1x9u0G4iDjYfNpzwADS1PnCXhEqL21zRplLsVA4z1tQn6ni0n1fEULH5y8QYTAmT1uEPNUjuYmKw50CAbDkChGIAyV3UDQm_2bhfA0_LCZz_G81F.wOxAgwxbMvX6EVIq2Y_QPjUnUk2BkV3OGzgk7sJ5Opu8wZNDo0b.paQfGUDfSFvgDm7ZqEaYv2XNrGKNFphIK_TXddSvQ5WxxIO3MZXTXlK0oler4zvf.qEmzkKRFyp1HKehxANSxQoVgcTGsob93_yLSYBvAxZVO3lh9AuJvfJVas4rjPJTeom_JQ5TqAGvT4XB2Z4OZGc7PAGrPL8wSMk4YdbaawA7.DUWH_qQR6mXXyppuWXZSWZSHHipYC7l7rpqfY.cEOST.TaxKM1POUKKSHNCnmYkRa26RutwqoV_721qcGNN0wUVGaGqmg0NxWSOlNdMiYUYlWjUXdyIfmw9yZD8Gesa4Yh4uqCauatNB1NXMXgK2_1xwBcMJNO69mXrFtPgqUdtToTMKMNcf6qORF.hYbRhFfr7yU23Y1JOmDi9e48W4DJY_E0BFmHYQWq5K3lX417fUI7uUg2LGCrJnze7.40Ltgh5RH_rWUBdjRXcNYzR9y3Ot9n3Bte_7x35BBXn_NABx4n06I2kuoZO.wa9MfE0XrI8QFhb1au3Mh1axKUCoA2yENUX74LEIpPEa7LKPWqbBVNdHluj2_XGBFk49GC4XwzYuTlFI81LBpb6pooaO.OIO7fisbcfT1s5a12RAhdo47mnXy4HSsQi5_sZyJMap7uUxkrct.Ddvx.GSfTkNFFCSBA4lrU3jDoUuAjPDZlFBM30FJE7OYREgIN50Y9lmBcV97RDLC2sMq3CYkhJNbADZgQDX0ar6TdO2ND5ufOddrWopuM3fVwjzQkIWRPvAqVPPLx.S6boEw_UUq6iWM4ND3af2O7msXY5d3bUkLzMTqbXmcv4MWu9AmeBrGYh1RIJ_WBVj9eSTN0sEb_as0vt6S5n7L7j9JOlJourIjHZUrSui.5C2n43Dj2fWN0Gj13WwvKmdIpvBMgdpkas5wwuC.Zwdr"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=9135fe3bcee83dad';window._cf_chl_opt.cOgUHash = location.hash === '' && location.href.indexOf('#') !== -1 ? '#' : location.hash;window._cf_chl_opt.cOgUQuery = location.search === '' && location.href.slice(0, location.href.length - window._cf_chl_opt.cOgUHash.length).indexOf('?') !== -1 ? '?' : location.search;if (window.history && window.history.replaceState) {var ogU = location.pathname + window._cf_chl_opt.cOgUQuery + window._cf_chl_opt.cOgUHash;history.replaceState(null, null, "\/abstracts\/search?q=spontaneous%20tumors&__cf_chl_rt_tk=C2OqJV8vSPlE7C98Ed2h9L8oVDxNx48F6LzJd9ni6qg-1739797569-1.0.1.1-Myd8elVuvnFUWK.m7DD2FJkSNE5eOngRN1noM.c.ZLQ" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>