Results of a combination of bleomycin and triamcinolone acetonide in the treatment of keloids and hypertrophic scars^*

Resultados de uma combinação de bleomicina e triamcinolone acetonide no tratamento de quelóides e cicatrizes hipertróficas

Abstracts

While treatment of keloids and hypertrophic scars normally shows modest results, we found that treatment with bleomycin was more promising. The present study was divided into two parts. In the first part the aim was to show the results using a combination of bleomycin and triamcinolone acetonide per cm² (BTA). In the second part the objective was to determine the response to both drugs in large keloids that were divided into 1 cm² squares, treating each square with the dose previously used. In the first part of the study, the clinical response of 37 keloids ranging from 0.3 to 1.8 cm² treated with BTA were followed up over a period of 1- 2 years. 0.375 IU bleomycin and 4 mg triamcinolone acetonide were injected every 3 months. In the second part of the study we reviewed the clinical response in six patients with large keloids. The monthly dose administered never exceeded 3 IU of bleomycin. The first study showed 36 keloids (97.29%) softening after the first dose. In the second study, 5 showed different responses (the response was complete in the four smaller keloids). The largest keloid needed 9 doses to achieve an improvement of 70%. In conclusion, combined treatment with 0.375 IU of bleomycin and 4mg of triamcinolone acetonide to 1 cm² was considered to be an acceptable procedure for the treatment of keloids. The best results were obtained in keloids over 1 cm² or when divided into 1 cm² square areas. Larger series need to be performed in order to confirm these results..

Bleomycin; Keloid; Triamcinolone acetonide

Enquanto normalmente o tratamento de queloides e cicatrizes hipertróficas mostra resultados moderados, o tratamento com bleomicina revelou resultados mais promissores. Este estudo foi dividido em duas partes. Na primeira parte, o objetivo foi mostrar os resultados da utilização de uma combinação de bleomicina e acetonido de triancinolona por cm² (BAT). Na segunda parte, o objetivo foi determinar a resposta aos dois medicamentos em queloides grandes, que foram divididos em quadrados de 1 cm², tratando cada quadrado com a dose utilizada anteriormente. Na primeira parte do estudo, a resposta clínica de 37 queloides de 0,3 to 1,8 cm² tratados com BAT foi monitorada por um período de 1 a 2 anos. Injeções de 0,375 UI de bleomicina e 4 mg de acetonido de triancinolona foram aplicadas a cada 3 meses. Na segunda parte do estudo, revisamos a resposta clínica em 6 pacientes com queloides grandes. A dose mensal administrada nunca excedeu 3 UI de bleomicina. O primeiro estudo mostrou que 36 queloides (97,29%) amoleceram após a primeira dose. No segundo estudo, 5 mostraram diferentes respostas (a resposta foi completa nos quatro queloides menores). O queloide maior necessitou de 9 doses para apresentar melhora de 70%. Concluindo, o tratamento combinado com 0,375 UI de bleomicina e 4 mg de acetonido de triancinolona por cm2foi considerado um procedimento aceitável para o tratamento de queloides. Os melhores resultados foram obtidos em queloides com mais de 1 cm² ou divididos em áreas de 1cm². Estudos mais amplos deveriam ser realizados, para confirmar esses resultados.

Bleomicina; Queloide; Triancinolona acetonida

INTRODUCTION

Keloids are benign hyperproliferative growths of dermal collagen usually resulting from excessive tissue response to skin injury; they are characterized by a tendency to recur. However, spontaneous keloids can occur without previous skin trauma. Keloids invade clinically normal adjacent skin and are often painful or/and pruritic.

Although their etiology is not fully understood, it is well-known that the combination of high prolidase activity (up to four-fold compared to normal skin) and the increase of type I procollagen and type I collagen concentration in the tissue (especially the latter) are involved.¹ There is hereditary or racial predisposition. The condition affects the presternal area, ear lobes, shoulders, ankles and/or face.

Keloids may cause pain, movement limitation, and other physical and psychological problems. The search for an effective treatment is therefore essential. Different options such as intralesional injections of bleomycin or corticosteroids either alone or combined with cryotherapy, compression therapy, silicone sheeting, radiation therapy, laser therapy, 5-fluorouracil, interferon, retinoids, imiquimod 5% cream, tacrolimus, verapamil and botulin toxin have been used, most of them with the aim of achieving the best functional and cosmetic solution possible.^{1 - 5}

Bleomycin is a useful drug in dermatology for intralesional therapy to treat cutaneous warts, Bowen's disease, basal and squamous cell carcinomas and haemangiomas.^{6 - 11} Local side-effects include hyperpigmentation, pain, necrosis, and atrophy.¹² Different reports present bleomycin as an effective treatment in keloid therapy and hypertrophic scars using different application methods such as dermojet, multiple needle punctures or syringe injection.^{2 , 12 , 13}

However, the dose required per cm² of surface and the possibility of avoiding side- effects with subsequent injections of triamcinolone acetonide has not been investigated to date in large series.

The objective of the first study was to find the ideal dose of bleomycin and triamcinolone acetonide for each 1 cm² of keloid. In the second study the aim was to demonstrate the response of larger keloids divided into 1 cm² squares in order to inject into each area the dose that had been previously demonstrated as being more effective.

MATERIAL AND METHODS

Between May 2004 and May 2006 we treated 10 white patients, 4 males and 6 females, aged 19 - 39 years, with Fitzpatrick skin phototypes II, III and IV. Two patients (nos. 8 and 9) presented one keloid; the others had between 3 and 9. 38 keloids and 2 hypertrophic scars (patient no. 7) were included in our study (Table 1). Three keloids bigger than 2 cm² (patients nos. 1, 4, and 6) were considered in the second study. In the first study 35 keloids of under 2 cm² and two hypertrophic scars were treated.

Table 1
First Study Patients' characteristics

Patient	Sex	Age	Skin Type	Etiology	Location	Lesion (size cm2)	Previous Treatment
1	M	19	III	NODULOCYSTIC ACNE	PRESTERNAL	6 (0.5-1.5)	SURGERY
					BACK	3 (1-1.8)	LASER THERAPY
2	F	23	III	SURGERY	PRESTERNAL	2 (1.1/1.5)	TRIAMCINOLONE ACETONIDE
					SHOULDER L	2 (1.2/1.5)	SILICONE
3	F	27	II	SPONTANEOUS	PRESTERNAL	1(1.8)	NO
					SCAPULAR R/L	2 (1.0/1.5)
4	M	39	III	NODULOCYSTIC ACNE	PRESTERNAL	2 (1.0/1.3)	TRIAMCINOLONE ACETONIDE
5	M	19	IV	NODULOCYSTIC ACNE	PRESTERNAL	4 (0.3-1.8)	SILICONE
6	M	27	III	NODULOCYSTIC ACNE	PRESTERNAL	4 (1.2-1.8)	NO
7	F	20	II	TRAUMATIC SCAR	CHEST	2 (1.0/1.3)	NO
					ABDOMINAL WALL	1 (1.4)	(Hypertrophic scar-HS)
					SHOULDER L	1 (1.5)
					RIGHT THIGH	1 (1.4)	(Hypertrophic scar-HS)
8	F	28	III	SPONTANEOUS	PRESTERNAL	1 (1.2)	SILICONE
9	F	26	III	SURGERY	PRESTERNAL	1 (1.5)	TRIAMCINOLONE ACETONIDE
10	F	29	III	TRAUMATIC SCAR	SHOULDER L	1 (16)	SILICONE
					SCAPULAR R	3 (0.6-1.3)

• L= Left R= Right

The keloids were located on the back, shoulders, presternal and scapular regions (Figures 1 - 6). The hypertrophic scars were located in the right abdominal wall and right thigh. Keloids were secondary to acne in 4 patients (nos. 1, 4, 5 and 6); to surgery in two patients with lateral projection on the scars in relation to the stitches (nos. 2 and 9); to traumatic scars in two patients (nos. 7 and 10); and spontaneous or of unknown origin in two patients (nos. 3 and 8). Only 3 patients (nos. 3, 6 and 7) had not been referred for previous therapies (Table 1). All the patients were informed of the type of treatment and gave their written consent.

FIGURE 1
Three keloids of 1.0 cm2, 1.2 cm² and 1.8 cm² right-to-left on back, before (a) and after two sessions of treatment (b)

FIGURE 2
Two keloids of 1.2 cm2 and 1.5 cm² on the left shoulder in a woman before (a) and after two sessions of treatment (b). Atrophy, most evident in the outer

FIGURE 3
Presternal keloid of 1.8 cm² before (a) and after two sessions of treatment (b), showing complete flattening

FIGURE 4
Keloid of 1.0 cm2 in right scapular region before (a) and after two sessions of treatment (b), showing significant flattening

FIGURE 5
Four presternal keloids between 0.3 to 1.8 cm² before (a) and after two sessions of treatment (b). Excellent softening but different flattening from significant to complete in relation to size

FIGURE 6
Large keloids of 3.96 cm² located on left shoulder, before (a) and after three sessions of treatment (b). Complete flattening

Exclusion criteria: patients under 18 years were not considered suitable for this treatment; pregnant and women likely to become pregnant women were not enrolled in the study. Regarding the keloids and hypertrophic scars, Patients being treated for keloids and hypertrophic scars during the previous six months were also excluded.

We used the same method in all our patients. In previous studies we had injected different doses from 0.25 to 0.50 ml (= 0.375 - 0.750 IU) for keloids of 1 cm², demonstrating that 0.25 ml was sufficinet enough to obtain good results. In this present study we injected 0.25 ml (= 0.375 IU by cm²) into an area of 1 cm² -l 1.2 cm² and increased the dose by 0.05 ml for each additional 0.2 cm².^{14 , 15}

In the second study we divided keloids into 1 cm² squared areas (patient nos. 1, 4 and 6) and accepted three new patients with large keloids (nos. 11, 12 and 13) (Figures 7 and 8) . The three latter were men aged 19-35 years, all with phototypes III, and with large keloids in the center of the chest as a result of nodulocystic acne. The size of these six keloids was 20.46 cm² (6.2 x 3.3 cm) in patient no. 1; 3.96 cm² (2.2 x 1.8 cm), in patient no. 4; 8.40 cm² (4.0 x 2.1 cm) in patient no. 6; 7.04 cm² (3.2 x 2.2 cm) in patient no. 11; 9.43 cm² (4.1 x 2.3 cm) in patient no. 12; and 35.26 cm² (8.2 x 3.3 cm + 4.1 x 2.0 cm) in patient no. 13 (Figure 8 and Table 2).

FIGURE 7
Keloid on left shoulder of 1.5 cm² before (a) and after three sessions of treatment (b). Excellent softening, high significant flattening and slight atrophy

FIGURE 8
Double presternal keloid (a) divided into 24 and 8 squares up-and-down respectively (b). Reduction of numbers of 1 cm² squared areas can be observed as result of treatment. After three sessions (nine subsessions of 4 (b), 3 (c), and 2 (d) in which maximum of 3.0 IU bleomycin was injected in each, the result showed excellent softening and highly significant flattening (e,f)

Table 2
Patients' characteristics (2nd Study)

Patient	Sex	Age	Skin Type	Etiology	Location	Lesion (size cm2)	Previous Treatment
1	M	19	III	Nodulocystic acne	Presternal	1 (6.2x3.3)	Surgery
4	M	39	III	Nodulocystic acne	Shoulder L	1 (2.2x1.8)	Triamcinolone acetonide
6	M	27	III	Nodulocystic acne	Presternal	1 (4.0x2.1)	No
11	M	35	III	Nodulocystic acne	Presternal	1 (3.2x2.2)	Triamcinolone acetonide
12	M	28	III	Modulocystic acne	Presternal	1 (4.1x2.3)	No
13	M	31	III	Nodulocystic acne	Presternal	1 (8.2x3.3 + 4.1x2.0)	No

A concentration of 1.5 IU/ml of bleomycin dilution was prepared from 15 IU in 10 ml of physiologic serum. The injection of bleomycin was slow - a rate of 0.05 ml per second. We never injected more than 3 IU of bleomycin per session. For this reason the large keloids received 3 IU for each 8 cm² with follow-up subsessions every 6 weeks for patient nos. 6 and 12, and monthly sessions for patients no.1 and 13. The latter patient received his total dose in four, three and two subsessions over a total period of thirteen and a half months as the size of keloid gradually reduced. (Figure 8). In three cases only we injected 0.2 ml/cm² (0.3 IU/cm²) in the first treatment, but this variant was not taken into account in the study overall. Subsequently, we infiltrated 4-5 mg/cm² of a 40 mg/ml triamcinolone acetonide solution to obtain whitening (0.10-0.125 ml in a syringe of 0.5 ml). We never injected more than 5 mg/cm² of triamcinolone acetonide, nor a total dose of 30 mg per keloid. The final step was to apply a silicone patch which had to be kept in place for two days. The sessions were repeated at 3 monthly intervals, with the exception of the above-mentioned larger keloids. Treatment response was evaluated in terms of flattening and softening of the lesions.

Patients were followed up every three months during 1- 2 years to observe recurrences and any side effects. The same physician assessed all the patients during their follow up (FMC), together with an external assessor.

Flattening was evaluated by comparing photos of the keloid before and after treatment and by measuring scar height (reduction percentage from baseline), classified on a 5-point scale - "1" was minimal flattening (< 50%); "2" moderate flattening (50-75%); "3' significant flattening (75-90%); and "4" highly significant flattening (> 90%) and "5" complete flattening (100%). Softening was evaluated according to a personal pliability scale by means of the "pinching technique": level 1 signified impossible to pinch (bad response); level 2 represented easy to pinch but with permanent erythema (partial response); and level 3 was assessed by a pinch producing an effect similar to normal skin (excellent response). We consider this personal method easier to perform than the 4-point scale commonly used in burn scars.¹⁶

RESULTS

The response of each keloid in both studies (1 and 2) is indicated in table 3, numbered from 1 to 43.

Table 3
First Study Patients' characteristics

PATIENT N° KELOIDS	SESSIONS	RESULTS	SE	R
1		S F	U-A
1	4 (3)[12]	2 2	●	Δ **
2	2	3 5
3	2	3 5
4	2	3 5
5	1	3 5
6	1	3 5
7	1	3 5
8	2	3 5
9	2	3 5
10	2	3 5
2
11	2	3 4
12	2	3 4
13	2	3 5	+++	Δ
14	2	3 5	++	Δ
3
15	2	3 5
16	2	3 3
17	2	3 5
4
18	2	2 3
19	4	2 3
20	3	3 5
5
21	2	3 5
22	2	3 4
23	2	3 3
24	2	3 3
6
25	2	3 5
26	2	3 5
27	2	3 5
28	2	3 4
29	3 (2)[6]	2 5
7
30	2	3 5
31	2	3 5	+
32	2	3 5	+
33	2	3 5	++
34	4	3 5	+
8
35	2	3 5
9
36	1	3 5
10
37	3	3 3	+
38	3	3 5
39	4	3 5	+
40	4	3 4
11
41	3	3 5
12
42	3 (2)[6]	3 5
13
43	3 (4-3-2)[9] +	2 4	●

From an aesthetic point of view all the patients in the first study were satisfied with the final results, although in our view the results obtained in the two presternal keloids of patient No. 4 (keloid nos. 18 and 19) were not entirely satisfactory.

In 36 cases (97.29%), partial or complete softening (level 2-3) was obtained after the first session. Complete flattening was achieved in 24 keloids (64.86%) in the second session. Only in four keloids (10.81%) were patients satisfied after the first session (patient no. 1 - keloids nos. 5, 6, 7 (1-1,5 cm²) and patient no. 9 - keloid no. 36 (size 1.5 cm²) all located in the presternal area), and two keloids (5.40%) (no. 34, 39) required four treatment sessions (see Figures 1, 2, 4 and 6). Five keloids (13.51%) (nos. 11, 12, 22, 28 and 40) achieved highly significant flattening, although no. 40 called for four sessions; and six (16.21%) (keloid nos. 15, 18, 19, 23, 24 and 37) showed significant flattening (Figures 3, 5 and 6).

In the second study the six larger keloids, divided into 1 cm² square areas (nos. 1, 20, 29, 41, 42 and 43), responded excellently after three sessions in 50% of the cases (nos. 20, 41 and 42), and partial softening after 4, 3 and 3 sessions in case nos. 1, 29 and 43 , although case 1 needed 12 subsessions, and case 43 a total of 9 subsessions, the last one completed after about 14 months of treatment (Figure 8 and Table 3). Only one case (2.70%) achieved moderate flattening (case 1). In this keloid measuring 20.46 cm² (patient no. 1), we performed surgery and laser therapy eight months before the intralesional infiltrations with bleomycin and triamcinolone acetonide. After twelve doses and four subsessions of 3 IU in each 8 cm² area, the response was "moderate' (Table 3). The other large keloids (nos. 20, 29, 41, 42 and 43) were divided into 4, 9, 8, 10 and 32 quadrangular areas of 1 cm² (Figure 8.a,b). After 3 sessions on keloids 20, 29, 41 and 42 we obtained a complete flattening, but keloid no. 43 required 9 subsessions (4, 3 and 2 times each session) in order to obtain a "highly significant' flattening, but with atrophy (Figure 8).

Three lesions (nos.11, 12 and 15) recurred within 3-12 months, and the treatment was repeated at a follow-up session three months later. After 18-24 months of follow-up, keloids of the first study and numbers 41 and 42 of the second study maintained their softening and flattening, as well as normal skin color, with the exception of no. 1 which maintained erythema and telangiectasias.

Eight keloids in the first study (nos. 13, 14, 31, 32, 33, 34, 37, 39) presented atrophy. This was especially evident in no. 13. All needed a twice-a-day application of minoxidil 5% (Figure 2). Only lesion no. 13 displayed slight atrophy after 24 months of follow-up.

The large keloids of cases 1 and 43 developed necrosis of the central quadrants, followed by an ulcer and subsequenly by an atrophic scar covered with telangiectasias. As a result, case 1 was lost to follow-up.

Although both infiltrations are painful, none of the patients complained of pain or severe pigmentation changes in the days after the infiltration. When we compared the incidence of pain after injection of bleomycin without the subsequent injection of 4 mg/cm² triamcinolone acetonide, previously received by several patients, all the patients reported that the pain felt during several days after injection did not occur when we applied the triamcinolone immediately post-injection.

COMMENTS

Bleomycin is a cytotoxic polypeptide with antitumoral, antibacterial and antiviral properties isolated from the fungus Streptomyces verticillus. It is used as a systemic chemotherapeutical agent since its mode of action appears to inhibit DNA synthesis and DNA destruction. RNA and protein synthesis is also inhibited to a lesser extent.^{7 , 13} The active effect of bleomycin used in the treatment of keloids and hypertrophic scars may possibly be explained by the inhibition of collagen synthesis by human dermal fibroblasts or stimulated by the presence of TGF-β.1, a cytokine detected in scar tissues at high levels.¹⁷ Other action mechanisms of bleomycin on keloids might be the increase of fibroblast apoptosis or the reduction of the lysyl oxidase levels, an enzyme found in high concentrations in keloids and hypertrophic scars.^{18 , 19}

Previous studies have demonstrated that intralesional injections of bleomycin in keloids and hypertrophic scars is a well-tolerated treatment, with few local and systemic side- effects, which suggests that this treatment can be used as first line therapy for keloids.¹²

In our experience, intralesional bleomycin is painful, especially when dermojet injected, and particularly when treating plantar warts, where the pain is extreme and unavoidable, occasionally requiring anesthetics.²⁰

On the other hand, the treatment of keloids with triamcinolone acetonide (TA) is a well-known, long-term standard therapy that has been employed as a single therapeutical procedure immediately after surgery, with a reduction from 50% to 91.90% of the possibility of a recurrence of keloids and of 50% to 95.24% in the case of hypertrophic scars, within 5 weeks after surgery.^{21 - 23} Unlike the anti-inflammatory effect of corticosteroids, the effect of TA is to induce a specific protein involved in the System A amino acid transport in human keloid fibroblasts that reduces the production of collagen and inhibits alpha.2macroglobulin, which in turn inhibits collagenase.^{24 , 25} The injection must always be performed in the papillary dermis, where collagenase is produced, and not in the subcutaneous tissue, given that it may produce underlying fat atrophy.²⁵ As for the pain caused by injecting triamcinolone acetonide, when we injected triamcinolone acetonide as the single therapeutic agent, this was certainly painful for the patient, as it was with bleomycin. For treating keloids, a number of authors have proposed injecting a dose of 10 mg/ml of TA at 3-6 ml/hour intervals, using an electric syringe and pumping 40 times, 22 times with lidocaine and 18 times without it.²⁶ Hoigne's effect was reported after intra-keloid injection of triamcinolone acetonide and lidocaine.²⁷ Other authors used EMLA or L-M-Y- (previously known as EMLA-Max) two hours before the procedure.²⁵ Finally, the combined use of TA with cryotherapy seems to be better than other combinations such as 5-fluorouracil or 585 nm flash lamp-pumped pulsed-dye laser, or at least comparable.^{3 , 28 , 29} We did not employ radiation therapy as proposed by other authors.^{25 , 30} Regarding the suitable dose to be injected per cm², we found only one report proposing 1-10 mg of TA, depending on the size of the lesion, to be applied at four-week intervals.³¹ Other side effects of TA frequently include hypopigmentation, which remains for between six and twelve months.²⁵

When we injected triamcinolone acetonide immediately after bleomycin, pain was reduced in minutes or even seconds, suggesting that this combination could well beneficial, at least hypothetically.

In the course of our study the greatest difficulty was to correctly determine the exact quantity of bleomycin and triamcinolone to be injected, as well as deciding on the most suitable size of surface for such doses. Our previous experiences with triamcinolone acetonide after cryotherapy taught us which dose was best able to reduce the pain caused by inflammation after cryotherapy, although it had previously caused minimal side effects.³

With respect to the bleomycin dose, although Tanigaki and Endo applied 0.4 ml/cm² (=0.60 IU/cm²) following a local anesthetic (2% prilocaine hydrochloride) - probably needed because they had used the dermojet (not our current practice), we prefer to apply 0.375 IU using insulin syringes to inject the bleomycin while slowly withdrawing the 1-cm-long needle.¹⁰ While is no significant difference between the quantity injected by the above authors (0.60 IU) and our recommendation (0.375 IU), we believe that it is simpler to inject 0.25 ml with insulin syringes of 0.5 ml or 1 ml. The maximum volume per session was 2 ml (3 IU), sufficient to treat 8 keloids of 1 cm² or 8 quadrants in large keloids.

In conclusion, we consider that 0.375 IU of bleomycin for each 1 cm² is an effective and safe treatment regardless of the technique employed. When used in combination with 4mg triamcinolone acetonide for each 1 cm², side effects such as necrosis and especially pain do not appear to be substantial, although this combination may increase the risk of dermal atrophy. We believe that our results were the best obtained so far, and this is the reason why we started using the technique routinely in our department for all patients presenting for treatment of keloids. However, we do believe that it is important to undertake other comparative studies in order to confirm the significance of the results we obtained.

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• ²⁹
  Manuskiatti W, Fitzpatrick RE. Treatment response of keloidal and hypertrophic sternotomy scars: comparison among intralesional corticosteroid, 5-fluorouracil, and 585-nm flashlamp-pumped pulsed-dye laser treatments. Arch Dermatol. 2002; 138:1149-55.
• ³⁰
  Mutalink S. Treatment of keloids and hypertrophic scars. Indian J Dermatol Venereol. 2005;71:3-8.
• ³¹
  Muneuchi G, Suzuki S, Onodera M, Ito O, Hata Y, Igawa HH. Long-term outcome of intralesional injection of triamcinolone acetonide for the treatment of keloid scars in Asian patients. Scand J Plast Reconstr Surg Hand Surg. 2006;40:111-6.

• *
  Study undertaken at the Deparment of Dermatology, Virgen Macarena University Hospital - Seville, Spain.

Publication Dates

• Publication in this collection
  June 2013

History

• Received
  09 Apr 2012
• Accepted
  10 Aug 2012