Premium
Optimization of the classical oral cancerization protocol in hamster to study oral cancer therapy
Author(s) -
Santa Cruz Iara S.,
Garabalino Marcela A.,
Trivillin Verónica A.,
Itoiz María E.,
Pozzi Emiliano C. C.,
Thorp Silvia,
Curotto Paula,
Guidobono Juan S.,
Heber Elisa M.,
Nigg David W.,
Schwint Amanda E.,
Monti Hughes Andrea
Publication year - 2020
Publication title -
oral diseases
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.953
H-Index - 87
eISSN - 1601-0825
pISSN - 1354-523X
DOI - 10.1111/odi.13358
Subject(s) - mucositis , field cancerization , dmba , medicine , cancer , carcinogenesis , gastroenterology , oncology , dermatology , radiation therapy
Objective(s) The hamster carcinogenesis model recapitulates oral oncogenesis. Dimethylbenz[a]anthracene (DMBA) cancerization induces early severe mucositis, affecting animal's welfare and causing tissue loss and pouch shortening. “Short” pouches cannot be everted for local irradiation for boron neutron capture therapy (BNCT). Our aim was to optimize the DMBA classical cancerization protocol to avoid severe mucositis, without affecting tumor development. We evaluated BNCT in animals cancerized with this novel protocol. Materials and methods We studied: Classical cancerization protocol (24 applications) and Classical with two interruptions (completed at the end of the cancerization protocol). BNCT mediated by boronophenylalanine (BPA) was performed in both groups. Results The twice‐interrupted group exhibited a significantly lower percentage of animals with severe mucositis versus the non‐interrupted group (17% versus 71%) and a significantly higher incidence of long pouches (100% versus 53%). Tumor development and the histologic characteristics of tumor and precancerous tissue were not affected by the interruptions. For both groups, overall tumor response was more than 80%, with a similar incidence of BNCT‐induced severe mucositis. Conclusion(s) The twice‐interrupted protocol reduced severe mucositis during cancerization without affecting tumor development. This favored the animal's welfare and reduced the number of animals to be cancerized for our studies, without affecting BNCT response.