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Biomedical subjects

V Chrenko

Publications and source records attributed to V Chrenko.

8 recordsLinked to original sources
PubMed2005

Pilot study of sole conformal peroperative interstitial brachyradiotherapy of early stage breast carcinoma using high-dose rate afterloading.

In this study of high-dose-rate brachyradiotherapy to the lumpectomy site as the sole radiation are documented a three-dimensional treatment planning and preliminary results of accelerated partial- breast irradiation. From March 2002 to July 2004 25 patients were prospectively included in this study. Six patients were excluded becuase of definitive histology of lobular carcinoma or positive margin. The median age was 63.2 years (range: 44-77 years). Median follow-up of all patients is 11 months (range: 3-25 months) with a minimum follow-up of 3 months. Radiation was delivered using the high-dose-rate remote afterloader VariSource with [192]Ir source. The patients received radiation twice a day at least 6 hours apart for a total of 10 fractions over five days with a single dose of 3.4 Gy. The total dose was 34.0 Gy prescribed as a minimum peripheral dose to match or minimally exceed the volume defined by the surgical clips as seen on CT scans. Freehand technique allows conformal placement of the catheters to the shape of the lumpectomy cavity. We use the method of geometric optimalisation which allows the calculations of dose distribution in relation to target. At a median follow-up of 11 months none of patients developed in-field breast recurrences, one patient had out-of-field recurrences. There were no regional nodal recurrences. At each patient, there was calculated target volume size in cm3 (median 91.3 cm3) dose volume histogram (DVH), dose homogenity index (DHI). Median DHI was 0.42. Median volume of breast tissue getting 100% of the prescription dose, V(100), is 87%; and V(150) 48.5%. We have noticed two treatment complications: hematoma and abscess in the place of tumorous bed after exstirpation. At last follow-up, patients rated the overall cosmetic outcome excellent. This method is suitable just for patients with histologically confirmed small tumors (<3 cm in diameter) without negative prognostic factors for local recurrence (age at least 40 years, negative surgical margins, nodal involvement - maximum three positive nodes without extracapsular extension).

Adult↗
PubMed2003

[Principles of post-resection brachytherapy of solid tumors using high dose rate (HDR) afterloading].

Postresection interstitial brachytherapy is one of the modern methods of radiotherapy the aim of which is to administer a larger radiation dose without greater irradiation of the surrounding sound tissues. The administration of higher radiation doses leads in some solid tumours to better local control of the disease and makes it thus possible to use the organ and its function after preserving surgical operations. Post-resection interstitial brachytherapy belongs in the wider concept to intraoperative radiotherapy the advantage of which is direct control of the irradiated area during surgery. The method of introduction of the radiation source into the applicators in the tumour during surgery (afterloading technique) makes its possible to start radiotherapy after obtaining the definite histological result. Post-resection brachytherapy reduces markedly the total time of irradiation treatment.

Brachytherapy↗
PubMed1998

[Sentinel lymphadenectomy in malignant cutaneous melanoma--short-term results and prognostic significance].

The predictive value of sentinel node status in skin melanoma was studied. Between August, 2, 1994 and February, 20, 1998, in Surgical Department of Masaryk Memorial Cancer Institute, Brno, 166 lymphatic regions were explored in 153 patients with 154 melanomas. We were not able to visit any other institute performing this procedure, so our beginning failure rate has been quite high, approx. 40% declining to final less than 3%. Lymphatic mapping was performed with the use of Patentblau V dye (BYK, Germany), injected preoperatively intradermally to the tumour or into the scar after nonradical removing of melanoma. Lyphoscintigraphy has been used in cases of dubious lymphatic spread, especially in trunk melanomas. Hand held gamma probe could not be used for unacceptable cost. From 143 identified sentinel nodes were 26 positive in 24 patients. From these patients 10 relapsed, with 6 locoregional and 4 distant recurrences. 2 Patients died. In 108 patient with negative sentinel node 3 recurrences occurred, one nodal, and two local, no distant metastases occurred till now. The incidence of positive sentinel nodes was growing with Breslow thickness. Extremely poor prognosis can be expected in patients with Breslow > 4.0 mm and positive sentinel node.

Humans↗
PubMed1993

[Myositis ossificans--a rare complication after axillary dissection].

We are showing a case of the myositis ossificans, appearing after the dissection of axilla simulating a metastasis of a malignant melanoma. In these circumstances this is a very rare case. It can, however, lead to an unnecessary operation. For this reason it should be useful to bera this possibility in mind.

Axilla↗
PubMed1992

[Partial mastectomy in the treatment of breast cancer].

In the submitted paper the authors summarize findings on conservative surgery in the treatment of breast cancer. Based on data in the literature and their own experience with surgical treatment of breast cancer of all stages and a detailed analysis of a group of 52 conservatively treated patients, the authors discuss indications for this treatment which must respect staging, typing and grading of tumours as well as attitudes of patients. In particular in tumours classified as T1, NO, MO (as well as T2, NO, MO up to 3 cm) with a non-central localization it is possible by using conservative surgery to avoid somatic mutilation and psychic sequelae of radical procedures. When an individual approach is used and the correct indication is selected, partial mastectomy with dissection of the axilla and postoperative radiotherapy is equivalent to therapeutic results of radical operation.

Adult↗
PubMed1992

[A surgical technique for partial mastectomy].

The authors are describing the technique of the partial mastectomy for the breast cancer in this work, as used in the Masaryk oncological institute. For easy understanding they are adding illustrations of the singular phases of this operation. They are also discussing the indications and are showing a short historical review of the authors having published the results of this surgery.

Female↗