Ketan Sharma

The impact of chemotherapy and radiation therapy on the remodeling of acellular dermal matrices in staged, prosthetic breast reconstruction

Background: An acellular dermal matrix will typically incorporate, in time, with the overlying mastectomy skin flap. This remodeling process may be adversely impacted in patients who require chemotherapy and radiation, which influence neovascularization and cellular proliferation. Methods: Multiple biopsy specimens were procured from 86 women (n = 94 breasts) undergoing exchange of a tissue expander for a breast implant. These were divided by biopsy location: submuscular capsule (control) as well as superiorly, centrally, and inferiorly along the paramedian acellular dermis. Specimens were assessed for cellular infiltration, cell type, fibrous encapsulation, scaffold degradation, extracellular matrix deposition, neovascularization, mean composite remodeling score, and type I and III collagen. Patients were compared based on five oncologic treatment groups: no adjuvant therapy (untreated), neoadjuvant chemotherapy with or without radiation, and chemotherapy with or without radiation. Results: Biopsy specimens were procured 45 to 1805 days after implantation and demonstrated a significant reduction in type I collagen over time. Chemotherapy adversely impacted fibrous encapsulation (p = 0.03). Chemotherapy with or without radiation adversely impacted type I collagen (p = 0.02), cellular infiltration (p < 0.01), extracellular matrix deposition (p < 0.04), and neovascularization (p < 0.01). Radiation exacerbated the adverse impact of chemotherapy for several remodeling parameters. Neoadjuvant chemotherapy also caused a reduction in type I (p = 0.01) and III collagen (p = 0.05), extracellular matrix deposition (p = 0.03), and scaffold degradation (p = 0.02). Conclusion: Chemotherapy and radiation therapy limit acellular dermal matrix remodeling. CLINICAL QUESTION/LEVEL OF EVIDENCE: Therapeutic, III.

Race and Breast Cancer Reconstruction: Is There a Health Care Disparity?

Background: Racial disparity continues to be a well-documented problem afflicting contemporary health care. Because the breast is a symbol of femininity, breast reconstruction is critical to mitigating the psychosocial stigma of a breast cancer diagnosis. Whether different races have equitable access to breast reconstruction remains unknown. Methods: Two thousand five hundred thirty-three women underwent first-time autologous versus implant-based reconstruction following mastectomy. Information regarding age, smoking, diabetes, obesity, provider, race, pathologic stage, health insurance type, charge to insurance, and socioeconomic status was recorded. Established statistics compared group medians and proportions. A backward-stepwise multivariate logistic regression model identified independent predictors of breast reconstruction type. Results: Compared with whites, African Americans were more likely to be underinsured (p < 0.01), face a lesser charge for reconstruction (p < 0.01), smoke (p < 0.01), have diabetes (p < 0.01), suffer from obesity (p < 0.01), live in a zip code with a lower median household income (p < 0.01), and undergo autologous-based reconstruction (p = 0.01). On multivariate analysis, only African American race (OR, 2.23; p < 0.01), charge to insurance (OR, 1.00; p < 0.01), and provider (OR, 0.96; p < 0.01) independently predicted type of breast reconstruction, whereas age (OR, 1.02; p = 0.06) and diabetes (OR, 0.48; p = 0.08) did not. Conclusions: African American race remains the most clinically significant predictor of autologous breast reconstruction, even after controlling for age, obesity, pathologic stage, health insurance type, charge to patient, socioeconomic status, smoking, and diabetes. Future research may address whether this disparity stems from patient preferences or more profound sociocultural and economic forces, including discrimination. CLINICAL QUESTION/LEVEL OF EVIDENCE: Risk, III.

Impact of Time Interval between Radiation and Free Autologous Breast Reconstruction.

Background To evaluate whether the timing of surgery after radiation in autologous breast reconstruction affects major complications. Methods We performed a retrospective review of 454 free flaps (331 patients) for breast reconstruction at a single institution from 2003 to 2014. Charts were reviewed for age, BMI, laterality, flap type (TRAM, msTRAM, DIEP), surgeon, donor vessels (IMA, TD), chemotherapy, smoking, diabetes, hypertension, DVT, venous anastomoses, vein size, and time from radiation (none, < 12 months, or ≥ 12 months). The primary outcome of major complications was defined as partial/total flap loss, thrombosis, ischemia, or hematoma requiring return to the operating room. To identify independent predictors of major complications, a multivariate logistic regression was constructed. Alpha = 0.05 indicated significance in all tests. Results Average age was 47.4 ± 8.4. Free flaps consisted of msTRAM (41.1%), TRAM (29.6%), or DIEP (29.3%). The donor vessel was IMA in 66.9% of flaps or TD in 33.0% of patients with 90.7% using only one vein and 9.3% with two veins. The average IMA/TDV size was 2.5 cm ± 0.5. Preoperative radiation occurred in 31.2% of flaps. There were 54 flaps with at least one major complication (11.7%). On multivariate regression, only flap type (OR =4.04, p < .01) and vein size (OR = 0.13, p = 0.02) independently predicted major complications. Conclusion There was no significant difference in major complications between flaps who had reconstruction within 12 months and greater than 12 months after radiation. Only having a more muscle sparing technique or smaller vein size were independent risk factors for major complications.

The Impact of Race on Choice of Post-Mastectomy Reconstruction: Is There a Healthcare Disparity?

Disclosure: No author has a financial interest in any product, device, or drug mentioned in this manuscript. A preliminary portion of this research was presented at MAPS, Chicago, 2015. An abstract published in The Annals of Plastic Surgery, June 2015, ‘Post-operative Drain Time Analysis, Outcomes and Complication Rates in Patients Receiving “Meshed” Versus “Un-Meshed” Acellular Dermal Matrix (ADM) in Partial SubMuscular Breast Reconstruction’.

Quantifying the Effect of Diabetes on Surgical Hand and Forearm Infections

PURPOSE Diabetes has long been established as a risk factor for hand and forearm infections. The purpose of this study was to review the effect of glycemic factors on outcomes among diabetic patients with surgical upper-extremity infections. We hypothesized that diabetic inpatients may benefit from stronger peri-infection glycemic control. METHODS A prospective cohort study enrolled diabetic and nondiabetic surgical hand and forearm infections over 3 years. Glycemic factors included baseline glycosylated hemoglobin, blood glucose (BG) at presentation, and inpatient BG. Poor baseline control was defined as glycosylated hemoglobin of 9.0% or greater and poor inpatient control as average BG of 180 mg/dL or greater. The main outcome of interest was the need for repeat therapeutic drainage. Multivariable logistic regression quantified the association between diabetic factors and this outcome. RESULTS The study involved 322 patients: 76 diabetic and 246 nondiabetic. Diabetic infections were more likely than nondiabetic infections to result from idiopathic mechanisms, occur in the forearm, and present as osteomyelitis, septic arthritis, and necrotizing fasciitis. Diabetic microbiology was more likely polymicrobial and fungal. After first drainage, diabetic patients were more likely to require repeat drainage and undergo eventual amputation. Among diabetic patients, poor inpatient control was associated with need for repeat drainage. CONCLUSIONS Diabetes exacerbates the burden of surgical upper-extremity infections: specifically, more proximal locations, deeper involved anatomy at presentation, broader pathogenic microbiology, increased need for repeat drainage, and higher risk for amputation. Among diabetic patients, poor inpatient glycemic control is associated with increased need for repeat drainage. TYPE OF STUDY/LEVEL OF EVIDENCE Prognostic I.

Abstract: Impact of Breast Reconstruction Patients on Cosmetic Practice

RESULTS: Of 70,339 patients identified as above, 9,931 had a complication associated with their procedure. mFI of 0.12 (±0.11) was calculated for these patients and was significantly greater than 0.077 (±0.85) for patients with no complications (p<0.001). When examining mFI correlation with Clavien-Dindo Grade IV complications (n=2,541), mFI once again was significantly greater (0.16 ± 0.12) than those with no Grade IV complications (0.080 ± 0.09; p<0.001). Multivariate analyses also showed that all individual factors of the mFI (diabetes mellitus, hx of MI, etc.) were predictive of any complications and Grade IV complications (p<0.001). Calculated odds ratios showed that higher pre-operative mFI also had a 7.77x likelihood of having any complication, 35.71x likelihood of having a Grade IV complication, 3.85x likelihood of having a surgical site complication, and a 62.05x likelihood of death (all p<0.001). Recursive partitioning revealed that a threshold of greater than 3 indicators of mFI conferred a 2.07x likelihood of a Grade IV complication and a 2.33x likelihood of death (both p<0.001).