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Main Author:	Susana del Toro-Arreola
Format:	Artículo científico
Language:	es
Published:	Instituto Mexicano del Seguro Social 2015
Subjects:	Medicina Inmunidad Neoplasias del cuello uterino infecciones por papilomavirus
Online Access:	https://www.redalyc.org/articulo.oa?id=457744942012
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Mecanismos de escape a la respuesta inmune innata en cáncer cervicouterino asociado a VPH Susana del Toro-Arreola Mariel García-Chagollán Luis Felipe Jave-Suárez Medicina Inmunidad Neoplasias del cuello uterino infecciones por papilomavirus El cáncer cervicouterino (CaCU) se caracteriza por el establecimiento de una infección persistente causada por el virus del papiloma humano (VPH). Pero ¿por qué el sistema inmune ignora o al menos muestra fallas para detectar la infección por VPH? Esta ha sido una pregunta central que ha permanecido durante años y que aún sigue sin contestarse en su totalidad, aunque en la actualidad ya se sabe que el VPH emplea una variedad de estrategias para evadir o subvertir la vigilancia inmune, lo cual será crítico para definir si persiste o no la infección viral y, por consiguiente, el riesgo de progresión a cáncer. Por lo mismo, en esta revisión se abordarán algunos de los mecanismos más importantes que el VPH utiliza para escapar al ataque inicial impuesto por la respuesta inmune innata y que le permiten establecerse como una infección persistente, lo cual facilita la progresión de las lesiones cervicales hasta que se convierten en cáncer. Indudablemente, el entendimiento del equilibrio entre factores virales e inmunológicos proporcionará información determinante que deberá tomarse en cuenta en la planeación estratégica de vacunas profilácticas y terapéuticas contra el CaCU asociado a la infección por VPH. 2015 artículo científico 0443-5117 https://www.redalyc.org/articulo.oa?id=457744942012 es http://www.redalyc.org/revista.oa?id=4577 Revista Médica del Instituto Mexicano del Seguro Social application/pdf Instituto Mexicano del Seguro Social Revista Médica del Instituto Mexicano del Seguro Social (México) Num.2 Vol.53

if (filemtime($filename) + $maxlifetime < time()) { unlink($filename); $count++; } } return $count; } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ protected function saveSession($sessId, $data): bool { $sessFile = $this->path . '/sess_' . $sessId; if ($handle = fopen($sessFile, 'w')) { $return = false; // Lock the file for exclusive access to avoid issues with multiple // processes writing session simultaneously: if (flock($handle, LOCK_EX)) { $return = fwrite($handle, $data); // Make sure that there's no trailing data by truncating the file to // the correct length: ftruncate($handle, strlen($data)); fflush($handle); flock($handle, LOCK_UN); } fclose($handle); if ($return !== false) { return true; } } // If we got this far, something went wrong with the file output... // It is tempting to throw an exception here, but this code is called // outside of the context of exception handling, so all we can do is // echo a message.

// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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