Objective

This research aimed to characterize HIV testing rates among Medicaid recipients with severe mental illness who received public specialty mental health services.

Methods

This retrospective cohort study examined California Medicaid records from October 1, 2010, to September 30, 2011 (N=56,895). Study participants were between age 18 and 67, utilized specialty mental health care services, were prescribed antipsychotic medications, and were not dually eligible for Medicare. Adjusted Poisson regression models were used to estimate the overall effects of predictor variables on HIV testing prevalence.

Results

During the study period, 6.7% of people with severe mental illness received HIV testing. Men were 32% less likely to be tested for HIV than women (p<.001). Compared with whites, Asians/Pacific Islanders were 53% less likely and blacks were 82% more likely to be tested (p<.001). Those with comorbid drug or alcohol use disorders were more likely to be tested than those without such disorders (p<.001). Utilization of nonpsychiatric medical care was the strongest predictor of HIV testing (p<.001).

Conclusions

Most adults with severe mental illness receiving public specialty mental health services were not tested for HIV during a one-year period. Public health administrators must prioritize HIV testing for early identification of HIV infection and prevention of HIV transmission.

OBJECTIVE: Lack of effective therapies remains a problem in the treatment of oral squamous cell carcinoma (OSCC), especially in patients with advanced tumors. OSCC development is driven by multiple aberrancies within the cell cycle pathway, including amplification of cyclin D1 and loss of p16. Hence, cell cycle inhibitors of the CDK4/6-cyclin D axis are appealing targets for OSCC treatment. Here, we determined the potency of palbociclib and identified genetic features that are associated with the response of palbociclib in OSCC. METHODS: The effect of palbociclib was evaluated in a panel of well-characterized OSCC cell lines by cell proliferation assays and further confirmed by in vivo evaluation in xenograft models. PIK3CA-mutant isogenic cell lines were used to investigate the effect of PIK3CA mutation towards palbociclib response. RESULTS: We demonstrated that 80% of OSCC cell lines are sensitive to palbociclib at sub-micromolar concentrations. Consistently, palbociclib was effective in controlling tumor growth in mice. We identified that palbociclib-resistant cells harbored mutations in PIK3CA. Using isogenic cell lines, we showed that PIK3CA mutant cells are less responsive to palbociclib as compared to wild-type cells with concurrent upregulation of CDK2 and cyclin E1 protein levels. We further demonstrated that the combination of a PI3K/mTOR inhibitor (PF-04691502) and palbociclib completely controlled tumor growth in mice. CONCLUSIONS: This study demonstrated the potency of palbociclib in OSCC models and provides a rationale for the inclusion of PIK3CA testing in the clinical evaluation of CDK4/6 inhibitors and suggests combination approaches for further clinical studies.

Oxygenation measurements are widely used in patient care. However, most clinically available instruments currently consist of contact probes that only provide global monitoring of the patient (e.g., pulse oximetry probes) or local monitoring of small areas (e.g., spectroscopy-based probes). Visualization of oxygenation over large areas of tissue, without a priori knowledge of the location of defects, has the potential to improve patient management in many surgical and critical care applications. In this study, we present a clinically compatible multispectral spatial frequency domain imaging (SFDI) system optimized for surgical oxygenation imaging. This system was used to image tissue oxygenation over a large area (16×12 cm) and was validated during preclinical studies by comparing results obtained with an FDA-approved clinical oxygenation probe. Skin flap, bowel, and liver vascular occlusion experiments were performed on Yorkshire pigs and demonstrated that over the course of the experiment, relative changes in oxygen saturation measured using SFDI had an accuracy within 10% of those made using the FDA-approved device. Finally, the new SFDI system was translated to the clinic in a first-in-human pilot study that imaged skin flap oxygenation during reconstructive breast surgery. Overall, this study lays the foundation for clinical translation of endogenous contrast imaging using SFDI.

Introduction

Although various methods exist for monitoring flaps during reconstructive surgery, surgeons primarily rely on assessment of clinical judgment. Early detection of vascular complications improves rate of flap salvage. Spatial frequency domain imaging (SFDI) is a promising new technology that provides oxygenation images over a large field of view. The goal of this clinical pilot study is to use SFDI in perforator flap breast reconstruction.

Methods

Three women undergoing unilateral breast reconstruction after mastectomy were enrolled for our study. The SFDI system was deployed in the operating room, and images acquired over the course of the operation. Time points included images of each hemiabdominal skin flap before elevation, the selected flap after perforator dissection, and after microsurgical transfer.

Results

Spatial frequency domain imaging was able to measure tissue oxyhemoglobin concentration (ctO2Hb), tissue deoxyhemoglobin concentration, and tissue oxygen saturation (stO2). Images were created for each metric to monitor flap status and the results quantified throughout the various time points of the procedure. For 2 of 3 patients, the chosen flap had a higher ctO2Hb and stO2. For 1 patient, the chosen flap had lower ctO2Hb and stO2. There were no perfusion deficits observed based on SFDI and clinical follow-up.

Conclusions

The results of our initial human pilot study suggest that SFDI has the potential to provide intraoperative oxygenation images in real-time during surgery. With the use of this technology, surgeons can obtain tissue oxygenation and hemoglobin concentration maps to assist in intraoperative planning; this can potentially prevent complications and improve clinical outcome.

Introduction

Although various methods exist for monitoring flaps during reconstructive surgery, surgeons primarily rely on assessment of clinical judgment. Early detection of vascular complications improves rate of flap salvage. Spatial frequency domain imaging (SFDI) is a promising new technology that provides oxygenation images over a large field of view. The goal of this clinical pilot study is to use SFDI in perforator flap breast reconstruction.

Methods

Three women undergoing unilateral breast reconstruction after mastectomy were enrolled for our study. The SFDI system was deployed in the operating room, and images acquired over the course of the operation. Time points included images of each hemiabdominal skin flap before elevation, the selected flap after perforator dissection, and after microsurgical transfer.

Results

Spatial frequency domain imaging was able to measure tissue oxyhemoglobin concentration (ctO2Hb), tissue deoxyhemoglobin concentration, and tissue oxygen saturation (stO2). Images were created for each metric to monitor flap status and the results quantified throughout the various time points of the procedure. For 2 of 3 patients, the chosen flap had a higher ctO2Hb and stO2. For 1 patient, the chosen flap had lower ctO2Hb and stO2. There were no perfusion deficits observed based on SFDI and clinical follow-up.

Conclusions

The results of our initial human pilot study suggest that SFDI has the potential to provide intraoperative oxygenation images in real-time during surgery. With the use of this technology, surgeons can obtain tissue oxygenation and hemoglobin concentration maps to assist in intraoperative planning; this can potentially prevent complications and improve clinical outcome.

Introduction: Two major disadvantages of currently available oxygenation probes are the need for contact with the skin and long measurement stabilization times. A novel oxygenation imaging device based on spatial frequency domain and spectral principles has been designed, validated preclinically on pigs, and validated clinically on humans. Importantly, this imaging system has been designed to operate under the rigorous conditions of an operating room. Materials and Methods: Optical properties reconstruction and wavelength selection have been optimized to allow fast and reliable oxyhemoglobin and deoxyhemoglobin imaging under realistic conditions. In vivo preclinical validation against commercially available contact oxygenation probes was performed on pigs undergoing arterial and venous occlusions. Finally, the device was used clinically to image skin flap oxygenation during a pilot study on women undergoing breast reconstruction after mastectomy. Results: A novel illumination head containing a spatial light modulator (SLM) and a novel fiber-coupled high power light source were constructed. Preclinical experiments showed similar values between local probes and the oxygenation imaging system, with measurement times of the new system being < 500 msec. During pilot clinical studies, the imaging system was able to provide near real-time oxyHb, deoxyHb, and saturation measurements over large fields of view (> 300 cm 2). Conclusion: A novel optical-based oxygenation imaging system has the potential to replace contact probes during human surgery and to provide quantitative, wide-field measurements in near real-time. © 2011 SPIE.