Analysis of C concentration in teeth to estimate the year of birth in the Mexican population.

The C analysis of permanent teeth employing nuclear techniques has a direct application in Forensic Sciences since teeth are the hardest part of the human body and can survive natural decay or extreme conditions. After the first Accelerator Mass Spectrometry Laboratory AMS-LEMA at UNAM, our research group is interested in reproducing C analysis on teeth as other countries to estimate age in the Mexican population samples. One of the main goals of this exploratory study is to know the best methodology considering relevant biological factors based on differences in tissues (enamel and dentin) that allows us to know the year of birth through the C concentration comparing the yield between C analyses from carbonate in enamel and collagen in dentin.

Salvage radiosurgery for selected patients with recurrent malignant gliomas.

Purpose: To analyse the survival after salvage radiosurgery and to identify prognostic factors.

Methods: We retrospectively reviewed 87 consecutive patients, with recurrent high-grade glioma, that underwent stereotactic radiosurgery between 1997 and 2010. We evaluated the survival after initial diagnosis and after reirradiation.

Selective use of postoperative neck radiotherapy in oral cavity and oropharynx cancer: a prospective clinical study.

Background: In cervical postoperative radiotherapy, the target volume is usually the same as the extension of the previous dissection. We evaluated a protocol of selective irradiation according to the risk estimated for each dissected lymph node level.

Methods: Eighty patients with oral/oropharyngeal cancer were included in this prospective clinical study between 2005 and 2008.

Early radiation-induced laryngeal malignant fibrous histiocytoma (MFH).

Postradiation sarcoma is a potential late sequela of ionising radiation and its frequency is rare. We present the case of a man with a radiation-induced malignant fibrous histiocytoma with a latent period of 20 months.