Publications by authors named "Gunar K Zagars"

Purpose: The purpose of this study is to investigate local control (LC), survival outcomes, and associated prognostic factors for patients with malignant peripheral nerve sheath tumors (MPNSTs) treated with combined surgery and radiation therapy (RT).

Methods: We reviewed the medical records of 71 consecutive patients treated with surgery and RT for localized MPNST between 1965 and 2012. Preoperative RT was used to treat 23 patients (32%) to a median dose of 50 Gy (range, 50 to 60 Gy), whereas 48 (68%) received postoperative RT to a median dose of 64 Gy (range, 45 to 70 Gy).

View Article and Find Full Text PDF

Purpose: The purpose of this study was to investigate the incidence of and risk factors associated with femur fracture after combined modality therapy for soft tissue sarcomas (STS) of the proximal lower extremity.

Methods And Materials: We reviewed the records of 596 patients with STS of the proximal lower extremity consecutively treated with surgery and radiation therapy (RT) from 1966 to 2012. One hundred ninety-seven patients (33%) received 50 Gy to the entire femur circumference (n = 197, 33%); 265 patients (45%) received perioperative chemotherapy, and during surgery, 155 patients (26%) had bone exposure, whereas 82 patients (14%) had the periosteum stripped.

View Article and Find Full Text PDF

Purpose: To report survival outcomes and local control in patients with solitary fibrous tumors (SFT) treated using surgery and radiation therapy (RT).

Methods: We reviewed the medical records of 31 consecutive patients definitively treated for SFT with surgery and RT between 1982 and 2012. The median age was 51 years (range, 23 to 88 y) and tumors were evenly distributed between the head and neck (n=9, 29%), trunk (n=10, 32%), and lower extremities (n=9, 29%).

View Article and Find Full Text PDF

Purpose: The purpose of this study was to investigate local control, survival outcomes, and complication rates of patients treated with limb-sparing surgery and radiation therapy (RT) for soft tissue sarcomas (STS) of the hands and feet.

Methods And Materials: We reviewed the medical records of 85 consecutive patients treated for STS of the hands (n=38, 45%) and feet (n=47, 55%) between 1966 and 2012. The median age was 41 years (range, 10-82 years of age).

View Article and Find Full Text PDF

Purpose: The purpose of this study was to investigate local control, survival outcomes, and complication rates of patients treated with aggressive surgery and radiation therapy (RT) for retroperitoneal sarcomas (RPS).

Methods And Materials: We reviewed the medical records of 121 consecutive patients treated for RPS with surgery and RT between 1965 and 2012. The most common histology was liposarcoma (n = 42; 35%).

View Article and Find Full Text PDF

Background: In the current study, the authors sought to evaluate outcomes, specifically with respect to adjuvant radiotherapy (RT), for patients with desmoplastic melanoma.

Methods: The records of 130 consecutive patients who presented between 1985 and 2009 with nonmetastatic desmoplastic melanoma and were treated curatively with either surgery alone (59 patients; 45%) or surgery and postoperative RT (71 patients; 55%) were retrospectively reviewed. Ages ranged from 21 years to 97 years (median age, 66 years).

View Article and Find Full Text PDF

Purpose: To evaluate outcomes of conservative surgery and radiation therapy (RT) treatment in patients with dermatofibrosarcoma protuberans.

Methods And Materials: We retrospectively reviewed the medical records of 53 consecutive dermatofibrosarcoma protuberans patients treated with surgery and preoperative or postoperative radiation therapy between 1972 and 2010. Median tumor size was 4 cm (range, 1-25 cm).

View Article and Find Full Text PDF

Background: Trabectedin and thioglitazones have been documented to induce adipocytic maturation in myxoid liposarcoma; we have noted this in our experience as well. Intriguingly, we have also encountered this same phenomenon in myxoid liposarcomas exposed to various combinations of neoadjuvant doxorubicin and ifosfamide systemic chemotherapy with preoperative radiation, where the pathological effects have been less characterized. We examined the histological changes, including adipocytic maturation, associated with this treatment in patients with myxoid liposarcoma and evaluated for prognostic significance.

View Article and Find Full Text PDF

Purpose: The aim of this study was to assess preoperative biopsy utilization for patients with soft tissue sarcoma (STS) of ≥5 cm in size and whether or not preoperative biopsy was associated with fewer surgical procedures to adequately treat these tumors.

Methods: We identified 899 patients from the Surveillance, Epidemiology, and End Results-Medicare database with a diagnosis of STS and who underwent surgical resection of their tumors between 1992 and 2006. We used diagnosis and procedure codes from claims data to identify which patients had a biopsy performed and the corresponding number of surgical procedures for each patient.

View Article and Find Full Text PDF

Background: Anorectal melanoma is a rare disease with a poor prognosis. Because survival is determined by distant failure, many centers have adopted sphincter-sparing excision for primary tumor control. However, this approach is associated with high rates of local failure (∼50%).

View Article and Find Full Text PDF

Background: The aim of the present analysis was to retrospectively evaluate outcomes in patients with cutaneous angiosarcoma of the face/scalp treated curatively with surgery, radiation therapy (RT), or a combination of surgery and RT.

Methods: In all, 70 patients with nonmetastatic angiosarcoma underwent surgery, RT, or combined-modality therapy. Of these, 20 patients (29%) were treated with surgery alone, 27 patients (39%) with RT alone, and 23 patients (33%) with combined-modality therapy; 44 patients received chemotherapy, either neoadjuvantly or adjuvantly or both.

View Article and Find Full Text PDF

Background: The aim of this study was to evaluate the role of regional nodal radiation therapy (RT) for patients with bilateral cervical nodal metastases from melanoma.

Methods: Between 1998 and 2008, 16 patients with bilateral cervical metastases without distant metastases were treated with postoperative RT (30 Gy in 5 fractions delivered twice weekly).

Results: Median follow-up was 5 months (range, 1-34 months).

View Article and Find Full Text PDF

Background: The current study was performed to evaluate outcomes in patients with osteosarcoma of the head and neck (OHN) who were treated with surgery with or without radiotherapy (RT).

Methods: Between 1960 and 2007, 119 patients with OHN underwent macroscopic total resection with or without RT. The median age of the patients was 33 years (range, 7-77 years).

View Article and Find Full Text PDF

The role of radiotherapy for nodal metastases from malignant melanoma is controversial. In patients with features that indicate high risk of recurrence of nodal disease, adjuvant irradiation lowers recurrence rates. High-risk features include extranodal spread of melanoma, more than two positive lymph nodes, large nodal size, or recurrent disease in previously dissected nodal basin.

View Article and Find Full Text PDF

Purpose: To compare treatment-related outcomes and toxicity for patients with axillary lymph node metastases from malignant melanoma treated with postoperative radiation therapy (RT) to either the axilla only or both the axilla and supraclavicular fossa (extended field [EF]).

Methods And Materials: The medical records of 200 consecutive patients treated with postoperative RT for axillary lymph node metastases from malignant melanoma were retrospectively reviewed. All patients received postoperative hypofractionated RT for high-risk features; 95 patients (48%) received RT to the axilla only and 105 patients (52%) to the EF.

View Article and Find Full Text PDF

Background: The objective of the current study was to analyze the potential treatment-related mortality in long-term survivors of soft-tissue sarcoma (STS) treated with radiotherapy (RT) and conservation surgery.

Methods: Between 1960 and 2000, 629 of 1089 patients treated with conservation surgery and RT for nonmetastatic STS at the University of Texas M. D.

View Article and Find Full Text PDF

Purpose: To evaluate long-term outcomes in patients with desmoid fibromatosis treated with radiation therapy (RT), with or without surgery.

Methods And Materials: Between 1965 and 2005, 115 patients with desmoid tumors were treated with RT at our institution. The median age was 29 years (range, 8-73 years).

View Article and Find Full Text PDF

Purpose: To evaluate the local control rates and patterns of metastatic relapse in patients with localized myxoid liposarcoma treated with conservation surgery and radiotherapy (RT).

Patients And Methods: Between 1960 and 2003, 127 patients with non-metastatic myxoid liposarcoma were treated with conservation surgery and RT at our institution. The median patient age was 39 years (range, 14-79 years).

View Article and Find Full Text PDF

Purpose: To evaluate prognostic factors and treatment outcomes in patients with localized synovial sarcoma treated with conservation surgery and radiotherapy (RT).

Methods And Materials: Between 1960 and 2003, 150 patients with nonmetastatic synovial sarcoma were treated with conservation surgery and RT. The majority of patients (81%) were aged >20 years.

View Article and Find Full Text PDF

Purpose: This study compared a large series of desmoid patients treated at a single institution to a previously published series from the same institution to determine if patient population characteristics, treatment approaches, and clinical outcomes had undergone change over the two study periods.

Materials And Methods: Data from a prospective soft tissue tumor database was used to analyze clinical courses of 189 desmoid patients treated at The University of Texas M.D.

View Article and Find Full Text PDF

Purpose: The aim of this study was to evaluate outcome and treatment toxicity after wide local re-excision (WLE), with or without additional radiation therapy, for patients with isolated first local recurrence of soft-tissue sarcoma arising within a previously irradiated field.

Methods: A retrospective review was performed of 62 consecutive patients. All patients underwent prior resection and external beam radiation.

View Article and Find Full Text PDF

Background: Soft-tissue sarcomas frequently rest in contact with bone. The purpose of the study was to evaluate the risk of local recurrence for sarcomas adjacent to bone and to determine whether the periosteum provides an adequate margin of resection.

Methods: Fifty patients with soft-tissue sarcomas abutting bone were treated at a single institution between 1990 and 2004.

View Article and Find Full Text PDF

Purpose: To evaluate the clinical outcomes of patients with localized retroperitoneal soft tissue sarcoma (STS) treated with complete surgical resection and radiation.

Methods And Materials: The medical records of 83 patients were reviewed retrospectively. Sixty patients presented with primary disease and the remaining 23 had recurrence after previous surgical resection.

View Article and Find Full Text PDF

Background: Correlations between various patient, tumor, and treatment characteristics and complications in patients undergoing combined modality treatment for primary lower extremity soft-tissue sarcomas were investigated.

Methods: Using the M. D.

View Article and Find Full Text PDF

Background: Major wound complications (MWCs) are frequent after preoperative radiotherapy (RT) for extremity soft-tissue sarcoma (STS). We examined the rate of MWCs at a single institution with readily available reconstructive surgery.

Methods: The medical records of consecutively treated extremity STS patients treated with preoperative external-beam RT and surgical resection from June 1996 through February 2003 were reviewed.

View Article and Find Full Text PDF