acyclovir and Head-and-Neck-Neoplasms

Herpes viruses are characterized by their ability to establish and maintain latent infections that can be reactivated. Several stimuli can trigger the reactivation of herpes viruses, which are perhaps best recognized in the recurrent blisters and ulcers associated with herpes simplex virus. We present two clinical cases of reactivation of herpes simplex virus during radiation therapy for management of cancers of the head and neck. Although the role of ionizing radiation in the reactivation of herpes simplex virus has not been established, we review the viral and host events associated with the establishment of orofacial herpes simplex virus infection, latency, and reactivation of the virus. We discuss current models of viral reactivation and suggest directions for further clinical research into the reactivation of orolabial herpes simplex virus during radiotherapy.

Topics: Acyclovir; Adult; Antiviral Agents; Carcinoma, Squamous Cell; Cerebellar Neoplasms; Head and Neck Neoplasms; Humans; Immunocompromised Host; Lymphoma, AIDS-Related; Lymphoma, B-Cell; Lymphoma, Large-Cell, Immunoblastic; Male; Middle Aged; Nasopharyngeal Neoplasms; Radiotherapy; Recurrence; Simplexvirus; Stomatitis, Herpetic; Virus Activation; Virus Latency

Neurological disorders and conditions affecting the maxillofacial region result in disabilities that affect an individual's functioning. Sensory or motor disturbances of the nerves may be caused by trauma, infections, pressure effect or infiltration by tumours or other health conditions. Two rare cases of nerve afflictions are described here with their typical clinical features. The first case had an involvement of maxillary, mandibular and ophthalmic divisions of the trigeminal nerve (sensory) due to herpes zoster infection in a very young patient and the second case had a unilateral isolated hypoglossal nerve palsy (motor) secondary to infiltration of the nerve by carcinoma of pyriform fossa.

Topics: Acyclovir; Adolescent; Adult; Antiviral Agents; Cranial Nerve Neoplasms; Head and Neck Neoplasms; Herpes Zoster; Humans; Hypoglossal Nerve Diseases; Male; Neoplasm Metastasis; Pyriform Sinus; Tongue Diseases; Trigeminal Nerve Diseases

The ability to achieve tumor selective expression of therapeutic genes is an area that needs improvement for cancer gene therapy to be successful. One approach to address this is through the use of promoters that can be controlled by external means, such as hyperthermia. In this regard, we constructed a replication-deficient adenovirus that consists of a mutated herpes simplex virus 1 thymidine kinase (mTK) fused to enhanced green fluorescent protein (EGFP) under the control of the full-length human heat shock (HS) 70b promoter. The virus (AdHSmTK-EGFP) was evaluated both in vitro and in vivo in oral squamous cell carcinoma SCC-9 cells for expression of both mTK and EGFP. The in vitro expression of mTK-EGFP was validated using both (3)H-penciclovir and fluorescence-activated cell sorting assays. These studies show that specific expression could be achieved by heating the cells at 41 degrees C for 1 h, whereas little expression was observed using high doses of virus without hyperthermia. The vector was also evaluated in vivo by direct intratumoral injection into mice bearing SCC-9 xenografts. These studies demonstrated tumor expression of mTK-EGFP after ultrasound heating of the tumors by radioactive biodistribution assays, histology and microPET imaging. These in vivo results, which demonstrate HS-inducible transgene expression using PET imaging, provide a means for noninvasive monitoring of heat-induced gene therapy in local tumors, such as oral squamous cell carcinomas.

Topics: Acyclovir; Adenoviridae; Animals; Antiviral Agents; Carcinoma, Squamous Cell; Cell Line, Tumor; Flow Cytometry; Gene Expression Regulation; Genes, Transgenic, Suicide; Genetic Vectors; Guanine; Head and Neck Neoplasms; Heat-Shock Proteins; Hot Temperature; Humans; Liver; Mice; Mice, SCID; Positron-Emission Tomography; Transplantation, Heterologous

The aim of the study was to investigate the incidence of herpes simplex virus-1 (HSV-1) infection in mucositis during head and neck cancer radiotherapy.. Sixty patients with malignant head and neck tumor, eligible to receive radiotherapy, who were referred to the Dental Oncology Unit, entered the study. Sixteen patients (26.6%) received concomitant chemotherapy. Mucositis was recorded weekly. Smears taken from the ulcers of mucositis grade 2, or 3, or 4 were stained with Papanicolaou and alkaline phosphatase/antialkaline phosphatase immunocytochemical method to identify HSV-1.. Forty-eight of all 60 patients developed ulcerative mucositis. Smear was available from 29 of 48 patients with ulcerations. HSV-1 infection was identified in 14 of 29 smears available (48.2%). Mucositis healed or was reduced after 1 week of antiviral treatment in 11 of those 14 HSV-1-positive patients; 3 patients responded to 1 g/day of valacyclovir, 7-2 g/day, and 1 patient responded to i.v. acyclovir. Ulcerations recurred after quitting antivirals. Three patients did not respond to 1 g/day of valacyclovir. No HSV-1-negative patient responded to acyclovir (P = 0.000).. HSV-1 was isolated from 14 of 29 available smears taken from 48 patients with ulcerative mucositis. The incidence of HSV-1 infection during radiotherapy was estimated as being 14 of all 48 patients at risk (29.1%). Healing or reduction in the grade of mucositis after antivirals in HSV-1 positive patients, combined with the negative response to antivirals in HSV-1 negative patients, denoted that HSV-1 infection was a component of ulcerative radiation mucositis in those HSV-1-positive patients.

Topics: Abnormalities, Radiation-Induced; Acyclovir; Adult; Aged; Aged, 80 and over; Antiviral Agents; Candidiasis, Oral; Dose-Response Relationship, Radiation; Female; Head and Neck Neoplasms; Herpes Simplex; Herpesvirus 1, Human; Humans; Incidence; Male; Middle Aged; Oral Ulcer; Radiotherapy; Recurrence; Stomatitis; Treatment Outcome; Valacyclovir; Valine

Topics: Acyclovir; Aged; Antiviral Agents; Diagnosis, Differential; Head and Neck Neoplasms; Herpes Zoster; Humans; Male; Melanoma; Pruritus; Scalp Dermatoses; Skin Neoplasms