Open Access

Clinical characteristics and therapeutic analysis of 51 patients with Marjolin's ulcers

  • Authors:
    • Rui Shen
    • Jinming Zhang
    • Fenggang Zhang
    • Yongjun Du
    • Weiqiang Liang
    • Lusheng Xu
    • Xueliang Du
    • Ping Chen
    • Xiaodong Chen
  • View Affiliations

  • Published online on: August 24, 2015     https://doi.org/10.3892/etm.2015.2699
  • Pages: 1364-1374
  • Copyright: © Shen et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Marjolin's ulcers, which are epidermoid carcinomas arising on non‑healing scar tissue, may be of various pathological types, including squamous cell carcinoma. The pathogenesis of squamous cell carcinoma arising in an ulcer differs from that of the primary cutaneous squamous cell carcinoma. This squamous cell carcinoma is aggressive in nature, and has a high rate of metastasis. Between January 2001 and September 2013, 51 patients with Marjolin's ulcers were admitted to the Departments of Plastic Surgery of the Affiliated Foshan Hospital and the Second Affiliated Hospital of Sun Yat‑sen University. The ulcers included 43 cases of squamous cell carcinoma, six of melanoma, one of basal cell carcinoma and one of epithelioid sarcoma. The clinical data of these patients were retrospectively analyzed. Patients were followed until mortality. Among the patients with squamous cell carcinoma, 30.23% exhibited sentinel lymph node metastasis and 11.63% had distant metastasis. Among the patients with melanoma, 66.67% had sentinel lymph node metastasis and 33.33% had distant metastasis. Sentinel lymph node metastasis was successfully detected in 11 patients with Marjolin's ulcer using 18F‑fluorodeoxyglucose positron emission tomography‑computed tomography and B‑mode ultrasound guided biopsy. Squamous cell carcinoma was often treated by extended resection and skin grafting or skin flap repair. Patients with deep, aggressive squamous cell carcinoma of an extremity and sentinel lymph node metastasis underwent amputation and lymph node dissection. This treatment was also used for melanoma type Marjolin's ulcers.

Introduction

Jean Marjolin first described malignant change arising in a skin ulcer in 1828. This condition was subsequently described by Smith in 1850 and Da Costa in 1903 (1,2). As these ulcers have not been extensively studied, the mechanisms underlying carcinomatous change remain unclear. Marjolin's ulcers are frequently induced by scarring following deep burns caused by hot ceramic, metal or soil (35). Marjolin's ulcers are usually considered to be highly aggressive tumors, with a rapid rate of regional metastases. Radical excision is the primary treatment option; however, there is currently no consensus regarding the efficacy of lymph node dissection. Marjolin's ulcers are typically associated with a poor prognosis, and may be life threatening. As living standards improve, the incidence of Marjolin's ulcers should gradually decrease. Although there are few reports of patients with Marjolin's ulcer in China (6), this is not a rare disease, even in the relatively well-developed Pearl River Delta region. The Departments of Plastic Surgery of the Affiliated Foshan Hospital (Foshan, China) and the Second Affiliated Hospital (Guangzhou, China) of Sun Yat-sen University, located in the Pearl River Delta region, treated 51 patients with Marjolin's ulcers between January 2001 and September 2013.

Materials and methods

Patients and data collection

Fifty-one patients who were treated for Marjolin's ulcers between January 2001 and September 2013 were retrospectively reviewed. Follow-up was continued for more than one year. The diagnoses were verified by incisional biopsies in all cases. The specimens received by our laboratory were fixed by formalin and processed using routine hematoxylin and eosin staining. Data collected included age, gender, time from initial ulceration to carcinomatous change, cause of initial ulceration, history of ulcer treatment, surgical treatment and follow-up results. The associations between pathological type and metastasis and between the location of squamous cell carcinoma and metastasis were analyzed. Eleven patients with deep, aggressive squamous cell carcinoma or melanoma and suspected sentinel lymph node metastasis underwent 18F-fluorodeoxyglucose positron emission tomography-computed tomography (PET-CT) and B-mode ultrasound-guided biopsy, with a 100% accuracy rate, for the detection of sentinel node metastasis. This retrospective study was approved by the ethical review boards of the participating instututions and written informed consent was obtained from all patients or their next of kin.

Results

Patients

The 51 patients with Marjolin's ulcers included 22 males (43.14%) and 29 females (56.86%) with a mean age of 64.15 years (range, 32–89 years). The mean time from initial ulceration to diagnosis of squamous cell carcinoma was 13.42 years (range, 6 months-54 years) and to diagnosis of melanoma was 2.47 years (range, 3 months-10 years). One patient developed epithelioid sarcoma after two years and one developed basal cell carcinoma after three years. Squamous cell carcinomas were located on the lower limb in 31 cases, the upper limb in seven cases, the head in four cases and the chest in one case. The six cases of melanoma were all located on the foot. One case of basal cell carcinoma was located over the occipital area and one case of epithelioid sarcoma was located on the foot.

The underlying injury causing ulceration was a burn scar in 35 cases and a traumatic wound scar in 16 cases. Ulceration was usually present for a long time prior to carcinomatous change. The non-healing of ulcers was associated with ineffective initial treatment. Of the 51 patients, seven (13.73%) received treatment in a large general hospital, eight (15.69%) received conservative treatment in the outpatient clinic of a community hospital, 23 (45.10%) received external application of Chinese herbs at home and 13 (25.49%) did not receive any treatment.

The pathological type was squamous cell carcinoma in 43 cases (84.31%), including 42 cases of well-differentiated squamous cell carcinoma (Broder's Grade I) and one case of moderately differentiated squamous cell carcinoma (Broder's Grade II), melanoma in six cases (11.76%), basal cell carcinoma in one case and epithelioid sarcoma in one case. The rate of metastasis varied among the pathological types. In patients with squamous cell carcinoma, the rate of sentinel lymph node metastasis was 30.23% and the rate of distant metastasis was 11.63%. In patients with melanoma, the rate of sentinel lymph node metastasis was 66.67% and the rate of distant metastasis was 33.33%. Lymph node and distant metastasis were not detected in the patients with basal cell carcinoma and epithelioid sarcoma (Table I).

Table I.

Metastasis according to the pathological type of Marjolin's ulcer.

Table I.

Metastasis according to the pathological type of Marjolin's ulcer.

Pathological typenPatients with sentinel lymph node metastasis, n (%)Patients with distant metastasis, n (%)
Squamous cell carcinoma4313 (30.23)5 (11.63)
Melanoma  6  4 (66.67)2 (33.33)
Basal cell carcinoma  1  0 (0.00)  0 (0.00)
Epithelioid sarcoma  1  0 (0.00)  0 (0.00)

The rates of lymph node metastasis and distant metastasis in patients with squamous cell carcinoma varied according to the location of the lesion. In patients with squamous cell carcinoma of the lower limb, the rate of sentinel lymph node metastasis was 35.48% and the rate of distant metastasis was 16.13%. In patients with squamous cell carcinoma of the upper limb, the rate of sentinel lymph node metastasis was 28.57% and the rate of distant metastasis was 0% (Table II). Eleven patients with squamous cell carcinoma and two patients with melanoma with deep, aggressive tumors and suspected sentinel lymph node metastasis underwent 18F-fluorodeoxyglucose PET-CT and B-mode ultrasound guided biopsy. These investigations had a 100% accuracy rate for the detection of metastasis (Table III).

Table II.

Sentinel lymph node and distant metastases according to the location of squamous cell carcinoma.

Table II.

Sentinel lymph node and distant metastases according to the location of squamous cell carcinoma.

LocationnSentinel lymph node metastasis, n (%)Distant metastasis, n (%)
Lower limb3111 (35.48)5 (16.13)
Upper limb  7  2 (28.57)  0 (0.00)
Head  4  0 (0.00)  0 (0.00)
Chest  1  0 (0.00)  0 (0.00)

Table III.

PET-CT and B-mode ultrasound-guided biopsy findings in 11 patients with aggressive tumors and suspected lymph node metastasis.

Table III.

PET-CT and B-mode ultrasound-guided biopsy findings in 11 patients with aggressive tumors and suspected lymph node metastasis.

Case no.GenderAge (years)Site of tumorType of tumorRegion of lymph node metastasis indicated by PET-CTResults of biopsy under ultrasound B-mode
  1Female47Left toesWell-differentiated SCCLeft groinPositive
  2Female37Left footModerately differentiated SCCLeft/right groin Positive/positive
  3Male47HeadWell-differentiated SCCHeadNegative
  4Female83Left footWell-differentiated SCCLeft groinPositive
  5Male55Left ankleWell-differentiated SCCLeft groinNegative
Left poplitealPositive
  6Male57Right footMelanomaRight groinPositive
  7Male54Left forearmWell-differentiated SCCLeft axillaryPositive
  8Male64Right popliteal fossaWell-differentiated SCCRight groinPositive
  9Female47Right handWell-differentiated SCCRight axillaryPositive
10Male48Left toeWell-differentiated SCCLeft groinPositive
11Male53Right footMelanomaLeft groinPositive

[i] SCC, squamous cell carcinoma; PET-CT, positron emission tomography-computed tomography.

Surgical methods and follow-up results

One patient with basal cell carcinoma on the head underwent extended resection and skin grafting, with no evidence of relapse or metastasis after eight years of follow-up. One patient with an epithelioid sarcoma over the occipital region underwent extended resection and skin grafting, with no evidence of relapse or metastasis after seven years of follow-up. Of the 43 patients with squamous cell carcinoma, 27 did not develop aggressive tumors or sentinel lymph node metastasis. These 27 patients underwent extended resection and skin grafting or skin flap repair. One of these patients succumbed to extensive metastasis after three years. Five patients developed deep, aggressive tumors with no metastasis. Four of these five patients underwent amputation and survived. One patient refused amputation and underwent only resection of the ulcer and surrounding tissues with skin grafting, and subsequently developed metastasis and succumbed one year later. Eleven patients developed deep, aggressive squamous cell carcinoma with inguinal, popliteal or axillary sentinel lymph node metastasis. Nine of these 11 patients underwent amputation and sentinel lymph node dissection, and eight patients survived. One patient who underwent amputation and inguinal lymph node dissection succumbed two years later due to pelvic lymph nodes and lung metastasis. One patient refused surgery and developed metastasis, and succumbed two years later. One patient developed deep, aggressive squamous cell carcinoma with extensive sentinel lymph node metastasis and distant pelvic lymph nodes metastasis. Radiotherapy was administered instead of surgery and the patient succumbed one year later due to lung metastasis (Table IV).

Table IV.

Treatment and follow-up results in 43 patients with squamous cell carcinoma.

Table IV.

Treatment and follow-up results in 43 patients with squamous cell carcinoma.

Case no.Age (years)Tumor locationTumor aggression, lymphatic metastasis and distant metastasisSurgical methodFollow-up (years)Follow-up results
  175Left calfNoExtended resection, skin grafting8Presence
  253Right footNoExtended resection, skin grafting7Presence
  348ScalpNoExtended resection, local skin flap5Presence
  432Right popliteal fossaNoExtended resection, skin grafting3Presence
  541Left thighNoExtended resection, skin grafting2Presence
  656Left calfNoExtended resection, skin grafting1Presence
  773Right popliteal fossaNoExtended resection, skin grafting2Presence
  862Left footNoExtended resection, skin grafting4Presence
  937Left elbowNoExtended resection, skin grafting2Presence
1078Left forearmNoExtended resection, skin grafting3Presence
1156Right popliteal fossaNoExtended resection, axial skin flap2Presence
1247Left calfNoExtended resection, Free skin flap3Presence
1389Right footNoExtended resection, skin grafting4Presence
1475Left footNoExtended resection, skin grafting2Presence
1551Left popliteal fossaNoExtended resection, skin grafting8Presence
1661Left thighNoExtended resection, skin grafting2Presence
1763Right footNoExtended resection, skin grafting2Presence
1847Right footNoExtended resection, skin grafting5Presence
1961Left thighNoExtended resection, skin grafting2Presence
2075Left footNoExtended resection, skin grafting1Presence
2168Left middle fingerNoExtended resection, skin grafting7Presence
2247ScalpNoExtended resection, local skin flap1Presence
2357ChestNoExtended resection, skin grafting3Presence
2475ScalpNoExtended resection, skin grafting1Presence
2546ScalpNoExtended resection, free skin flap4Presence
2667Right eyelidNoExtended resection, local skin flap7Presence
2737Left footNoExtended resection, axial skin flap3Metastasized to bilateral inguinal groove, left thigh and lung; mortality
2858Right footplateDeep aggression, no metastasisAmputation8Presence
2974Right forefingerDeep aggression, no metastasisFinger amputation1Presence
3079Right forefingerDeep aggression, no metastasisFinger amputation3Presence
3138Left footplateDeep aggression, no metastasisAmputation2Presence
3289Left popliteal fossaDeep aggression, no metastasisRefused to amputation; extended resection, skin grafting only1Metastasized to left inguinal lymph node and lung; mortality
3364Right popliteal fossaDeep aggression; metastasized to right inguinal lymph nodeAmputation, right inguinal lymph node dissection5Presence
3448Left toeDeep aggression; metastasized to left inguinal lymph nodeToe amputation, left inguinal lymph node dissection2Presence
3555Left ankleDeep aggression; metastasized to left popliteal lymph nodeAmputation, left popliteal and inguinal lymph node dissection1Presence
3666Right footDeep aggression; metastasized to right inguinal lymph nodeAmputation, right inguinal lymph node dissection5Presence
3747Right handDeep aggression; metastasized to left axillary lymph nodeAmputation, left axillary lymph node dissection2Presence
3854Left forearmDeep aggression; metastasized to left axillary lymph nodeAmputation, left axillary lymph node dissection4Presence
3951Right popliteal fossaDeep aggression; metastasized to left inguinal lymph nodeAmputation, left inguinal lymph node dissection1Presence
4047Left toeDeep aggression; metastasized to left inguinal lymph nodeAmputation, left inguinal lymph node dissection2Presence
4158Left popliteal fossaDeep aggression; metastasized to left inguinal lymph nodeAmputation, left inguinal lymph node dissection2Metastasized to pelvic lymph nodes and lung; mortality
4283Left footDeep aggression; metastasized to left inguinal lymph nodeRefused to undergo surgery2Metastasized to lung; mortality
4378Left thighDeep aggression; metastasized to left inguinal lymph nodes and pelvic lymph nodesNo surgery, radiotherapy1Metastasized to lung; mortality

Two of the six patients with melanoma succumbed. One patient with melanoma on the right foot, right inguinal lymph node metastasis and lung metastasis was considered to have unresectable disease and received interferon therapy, and one patient with melanoma on the left foot and left inguinal lymph node metastasis refused surgery. These two patients succumbed from lung metastasis six months later. The other four patients survived. Two of these four patients did not develop metastasis, and underwent extended resection and skin grafting or skin flap reconstruction. The remaining two patients with melanoma on the foot and inguinal lymph node metastasis underwent extended resection and skin grafting or amputation combined with inguinal lymph node dissection, and survived with no evidence of relapse or metastasis (Table V).

Table V.

Characteristics of six patients with melanoma.

Table V.

Characteristics of six patients with melanoma.

Case no.Tumor locationLymphatic and distant metastasesTherapyFollow-up (months)Follow-up results
1Right footLung, right inguinal lymph node metastasisInterferon  6Lung metastasis; mortality
2Left footplateLeft inguinal lymph node metastasisRefused the treatment  6Lung metastasis; mortality
3Left footplateNo metastasisExtended resection, skin grafting21Presence
4Left footplateNo metastasisExtended resection, medial pedal flap of footplate41Presence
5Right footplateRight inguinal lymph node metastasisAmputation, right inguinal lymph node dissection31Presence
6Right heelRight inguinal lymph node metastasisExtended resection, skin grafting, right inguinal lymph node dissection26Presence

A number of patients had unusual presentations of disease. In one patient, squamous cell carcinoma developed simultaneously in traumatic skin ulcers on the lateral and medial sides of the left ankle. One patient developed squamous cell carcinoma in a burn scar ulcer over the temple, which extended through the bone and dura mater into the brain (Fig. 1). Three patients developed squamous cell carcinoma in an ulcer on the finger (Fig. 2).

Case report

A 55-year-old male with a 20-year history of ulceration over the lateral and medial aspects of his left ankle presented with a two-month history of pain. In 1993, he had developed chronic ulceration on either side of the ankle from friction caused by his shoe. The wounds were originally treated with saline irrigation by a rural doctor. The patient worked in a paddy field and had poor economic circumstances.

Physical examination revealed a 4.5-cm-diameter ulcer over the medial aspect and a 5-cm-diameter ulcer over the lateral aspect of the left ankle. A Marjolin's ulcer with similar histological characteristics occurring in different parts of the body simultaneously is a rarely reported occurrence. The crater-shaped ulcers were dirty, necrotic and malodorous, with surrounding tissue proliferation (Figs. 3 and 4).

Radiography showed areas of dense cortical bone and new periosteal bone formation in the middle and distal parts of the left tibia and fibula, and in the calcaneus and talus. There was a small area of bone destruction in the distal part of the tibia, with signs of chronic osteomyelitis and surrounding soft tissue swelling (Fig. 5). Bacterial cultures of the wound surface revealed Proteus penneri.

In September 2012, the patient underwent partial resection of the lesions. Pathological examination showed well-differentiated squamous cell carcinoma in the two lesions (Fig. 6). PET-CT showed abnormal uptake in the lymph nodes of the left popliteal fossa and left inguinal region, but it was unclear whether this represented wound infection or tumor metastasis (Fig. 7).

In September 2012, the patient underwent below-knee amputation of the left leg for these aggressive lesions. Two weeks after surgery, PET-CT still showed increased uptake in the lymph nodes of the left popliteal fossa and inguinal region, indicating possible metastasis. The patient then underwent B-mode ultrasound-guided biopsy of the left popliteal and inguinal lymph nodes. Examination of the biopsy specimens showed metastasis in the popliteal nodes, but not in the inguinal nodes (Fig. 8).

The patient underwent left popliteal and inguinal lymph node dissection. Postoperative pathological examination showed metastatic squamous cell carcinoma in the popliteal nodes but not in the inguinal nodes, which was consistent with the previous biopsy findings. There was no evidence of relapse or metastasis after one year.

Discussion

Marjolin's ulcers are tumors that form in chronic skin ulcers, predominantly on burn scar wounds. These tumors also develop on other wounds, including pressure sores (7), venous stasis ulcers (8), traumatic wounds (9), osteomyelitis (10), fistulas (11), leprosy ulcers (12) and lacerations (13). Burn scars are reported to have a rate of carcinomatous change of 2% (14). The most common type of Marjolin's ulcer is squamous cell carcinoma, followed by basal cell carcinoma, sarcoma and melanoma (15,16). Kowal-Vern and Criswell (17) retrospectively reviewed 412 cases of Marjolin's ulcers reported in 146 studies between 1923 and 2004, and found that 71% had squamous cell carcinoma, 12% had basal cell carcinoma, 6% had melanoma, 5% had sarcoma and 6% had other tumors. The present study included 51 patients with Marjolin's ulcers, including 43 (84.31%) with squamous cell carcinoma and six (11.76%) with melanoma.

Kowal-Vern and Criswell (17) reported that the average period of ulceration prior to carcinomatous change was 31 years. The present study included more female (56.86%) than male (43.14%) patients. The mean period of ulceration prior to carcinomatous change was relatively short (13.42 years for squamous cell carcinoma and 2.47 years for melanoma). The rates of lymph node and distant metastasis are higher in squamous cell carcinoma-type Marjolin's ulcer than in primary cutaneous squamous cell carcinoma (4,18). Kowal-Vern and Criswell (17) reported regional or sentinel lymph node metastasis in 22% of cases of squamous cell carcinoma-type Marjolin's ulcer, distant metastasis in 14% and a resulting mortality rate of 21%. Novick et al (19) reported a metastasis rate of 54% from lower limb squamous cell carcinoma-type Marjolin's ulcer, including metastases to the brain, liver, lung, kidney and distant lymph nodes. In the present study, patients with squamous cell carcinoma had a regional or sentinel lymph node metastasis rate of 30.23% and a distant metastasis rate of 11.63%. In patients with squamous cell carcinoma of the lower limb, the rate of sentinel lymph node metastasis was 35.48% and the rate of distant metastasis was 16.13%. In patients with squamous cell carcinoma of the upper limb, the rate of sentinel lymph node metastasis was 28.57% and the rate of distant metastasis was 0%. The location of the tumor was strongly associated with the rate of metastasis. Squamous cell carcinoma in the lower limb has previously been reported to have a higher rate of metastasis (20). Among patients with melanoma, 66.67% had sentinel lymph node metastasis and 33.33% had distant metastasis.

Squamous cell carcinoma and melanoma are aggressive types of tumor with high rates of metastasis. It is therefore important to detect sentinel lymph node and distant metastases prior to deciding the therapeutic regimen. Patients with sentinel lymph node metastasis should undergo lymph node dissection (21). PET-CT has a high sensitivity for the detection of metastasis and has been reported to be useful for the detection of lymph node metastasis in patients with malignant melanoma (22). Sentinel lymph node biopsy is a relatively non-traumatic method of screening for lymph node metastasis in patients with squamous cell carcinoma-type Marjolin's ulcers (23). In the present study, we were able to identify sentinel lymph node metastasis by detecting areas of increased uptake on PET-CT. However, B-mode ultrasound-guided biopsy and surgical specimen examination findings showed that certain nodes with increased uptake on PET-CT exhibited inflammatory hyperplasia but not metastasis. The reasons for this are unclear. PET-CT findings alone are therefore insufficient for the definitive diagnosis of lymph node metastasis, and they should be used in combination with ultrasound-guided biopsy findings. The Affiliated Foshan Hospital started using a Philips Gemini PET-CT scanner (Philips Healthcare, Best, the Netherlands) in February 2004. In the present study, only 11 patients underwent both PET-CT and ultrasound guided biopsy, and the accuracy rate for diagnosis of sentinel lymph node metastasis was 100% in these patients. Prior to the introduction of PET-CT, patients with suspected sentinel lymph node metastasis underwent B-mode ultrasound and CT examinations, but the findings were less precise than those with PET-CT. Distant metastasis can be detected early using PET-CT alone, and patients with distant metastasis are considered to have unresectable disease.

The pathogenesis of Marjolin's ulcers remains poorly understood. Development of squamous cell carcinoma in burn scar ulcers was reported to be associated with local Fas gene mutation and deletion (24,25). Diagnosis of Marjolin's ulcers depends on the pathological examination of biopsy specimens. Sampling from different sites increases the diagnostic rate (16). Patients with chronic or recurrent skin ulcers that do not heal after several months of conservative treatment should undergo biopsy for early diagnosis. Marjolin's ulcers should be treated by extended resection and skin grafting or skin flap repair (26). The resection margin should extend ≥2 cm beyond the edges of the lesion (20). Amputation is necessary when the tumor has invaded the bones, for aggressive tumors and for tumors that cannot otherwise be resected with adequate margins. Sentinel lymph node dissection is required in patients with sentinel lymph node metastasis (9,20,26). Patients with squamous cell carcinoma and sentinel lymph node metastasis can undergo amputation and sentinel lymph node dissection. The present data confirm that squamous cell carcinoma-type Marjolin's ulcers can occur in different regions of the body, but that sentinel lymph node metastasis most commonly occurs in limb lesions, particularly of the lower limb. Patients with limb lesions can therefore be treated by amputation and sentinel lymph node dissection with satisfactory results.

Similar to patients with squamous cell carcinoma, patients with melanoma who do not have metastasis should undergo more extended resection and skin grafting or skin flap repair. Patients with sentinel lymph node metastasis but no distant metastasis should undergo amputation with lymph node dissection. In the present study, all malignant melanoma-type ulcers occurred in the lower limb. However, unlike with squamous cell carcinoma, patients with melanoma and with distant or extensive lymph node metastasis cannot be cured by surgical treatment, and interferon therapy should be considered in these patients, despite its poor curative effects.

There is no evidence that radiotherapy is a successful first-line treatment choice for squamous cell carcinoma. Squamous cell carcinoma in Marjolin's ulcers is usually well- or moderately differentiated, and radiotherapy is therefore not effective (16,21). Radiotherapy may also induce further carcinomatous change. Radiotherapy was therefore not selected as the first treatment choice in any of the patients in this study.

Marjolin's ulcers are preventable. Chronic skin ulcers should be actively treated to avoid carcinomatous change (26,27). In this study, the mean patient age was 64.15 years. The majority of the patients had been treated ineffectively with Chinese herbs or other local remedies due to their poor financial circumstances, and some did not receive any treatment. This resulted in chronic ulceration that eventually underwent carcinomatous change. Recently, a new cooperative medical care system has been developed in rural areas of China, and the Urban Employee Medical Insurance system has been established (28,29). Patients with financial restrictions can therefore be treated in hospital, which may help to reduce the incidence of Marjolin's ulcers.

In conclusion, the results of the present study strongly indicate that chronic skin ulcers should be treated as early as possible and carefully followed-up. PET-CT combined with B-mode ultrasound-guided biopsy can precisely detect sentinel lymph node metastasis and guide clinical therapy. Patients with squamous cell carcinoma- or melanoma-type Marjolin's ulcers and sentinel lymph node metastasis should undergo amputation and sentinel lymph node dissection, since such tumors predominantly occur in the limb, particularly in the lower limb.

Acknowledgements

The study was supported by Medical Scientific Research Foundation of Guangdong Province, China (no. A2012637).

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Shen R, Zhang J, Zhang F, Du Y, Liang W, Xu L, Du X, Chen P and Chen X: Clinical characteristics and therapeutic analysis of 51 patients with Marjolin's ulcers. Exp Ther Med 10: 1364-1374, 2015
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Shen, R., Zhang, J., Zhang, F., Du, Y., Liang, W., Xu, L. ... Chen, X. (2015). Clinical characteristics and therapeutic analysis of 51 patients with Marjolin's ulcers. Experimental and Therapeutic Medicine, 10, 1364-1374. https://doi.org/10.3892/etm.2015.2699
MLA
Shen, R., Zhang, J., Zhang, F., Du, Y., Liang, W., Xu, L., Du, X., Chen, P., Chen, X."Clinical characteristics and therapeutic analysis of 51 patients with Marjolin's ulcers". Experimental and Therapeutic Medicine 10.4 (2015): 1364-1374.
Chicago
Shen, R., Zhang, J., Zhang, F., Du, Y., Liang, W., Xu, L., Du, X., Chen, P., Chen, X."Clinical characteristics and therapeutic analysis of 51 patients with Marjolin's ulcers". Experimental and Therapeutic Medicine 10, no. 4 (2015): 1364-1374. https://doi.org/10.3892/etm.2015.2699