Chapter 70 Surgical Management of Posterior Uveal Melanoma CAROL L. SHIELDS and JERRY A. SHIELDS Table Of Contents |
There have been several new developments in the management of patients with choroidal melanoma over the past decade. Depending on the clinical circumstances, observation, photocoagulation, transpupillary thermotherapy, plaque radiotherapy, charged particle irradiation, local resection, enucleation, orbital exenteration, chemotherapy, and immunotherapy have been employed.1–4 There has been a trend away from photocoagulation, with increasing interest in transpupillary thermotherapy (TTT) alone for small melanomas or TTT in combination with radiotherapy for small, medium, and some large melanomas. The recently recognized clinical risk factors for growth and metastasis of small melanocytic tumors allows for earlier detection and treatment of small choroidal melanoma. Consequently, there is a trend away from observation and a focus toward earlier treatment of small melanocytic lesions that possess risk factors. This chapter provides an overview of the methods of management for patients with choroidal melanoma. |
GENERAL CONSIDERATIONS |
Historically, enucleation of the affected eye was considered to be the
only appropriate management for the patient with a posterior uveal melanoma. However, several
years ago, some authorities challenged the effectiveness
of enucleation for preventing metastatic disease and even proposed
that enucleation may somehow promote or accelerate metastasis.5,6 The validity of these arguments was challenged by others who believed
that early enucleation offered the patient the best chance of cure.7,8 This controversy over enucleation was responsible for initiating a trend
away from enucleation and the increased use of more conservative therapeutic
methods. Depending upon several clinical factors, management options today include observation, photocoagulation, TTT, radiotherapy, local resection, enucleation, and various combinations of these methods. The two most frequently employed treatment methods today are enucleation and plaque radiotherapy. The Collaborative Ocular Melanoma Study (COMS) was organized and funded in 1985 to address several issues related to management of choroidal melanoma.9 More recently, there has been a documented trend of detection of smaller choroidal melanomas and increasing use of conservative treatment methods such as plaque radiotherapy.1,10–12 |
PERIODIC OBSERVATION | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Approximately 6% of the Caucasian population manifests choroidal
nevus.13 Choroidal nevi are managed by periodic observation. It is estimated that 1 in 5,000 choroidal
nevi evolve into choroidal melanoma.14 Risk factors predictive of growth of small melanocytic lesions and their
combined predictive values are listed in Tables 1 and 2 (Fig. 1). Documented growth of a melanocytic choroidal tumor is suggestive
that the lesion is a choroidal melanoma. Because documented growth may
be associated with worse systemic prognosis, some patients with small
tumors that show three or more risk factors are treated promptly, without
waiting for documentation of growth.12,15,16 On the basis of the few patients with medium-size choroidal melanoma who
refuse treatment and are followed, natural history studies have found
that there is greater mortality and higher risk of death.17 TABLE 1. Clinical features predictive of growth of small melanocytic choroidal tumors (≤3 mm thickness)12
TABLE 2. Tumor growth in 1287 small (≤3 mm thickness) melanocytic choroidal tumors based on combination of clinical risk factors11
F = subretinal fluid, O = orange pigment, M = posterior margin touch optic disc, S = symptoms, T = thickness >2 mm
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PHOTOCOAGULATION |
Photocoagulation is still an acceptable method for treating selected small
choroidal melanomas.18,19 It was originally performed with xenon photocoagulation and later with
argon laser photocoagulation. Studies showed that xenon achieved better
tumor control but argon was associated with fewer complications.19 Low-energy long-exposure laser therapy has been advocated by some authorities.18 Recently, TTT has largely replaced argon laser for treating selected small
melanomas, particularly those that are less than 3 mm in thickness
and located more than 3 mm from the foveola. Photodynamic therapy using verteporfin has been considered, but there is little evidence of its effectiveness. One report on four patients showed tumor regression for 18 months in one patient, but lack of response or continued growth in three patients.20 |
TRANSPUPILLARY THERMOTHERAPY | |
Transpupillary thermotherapy (TTT) is a recently popularized
method of treating selected small- and medium-sized choroidal melanomas.21–24 With this technique, infrared radiation, using a modified diode laser
system, delivers heat to the tumor, causing tumor necrosis. Transpupillary
thermotherapy is typically delivered in three sessions and, at completion, leaves
an atrophic chorioretinal scar at the site of the previous
tumor. Tumor control is found in over 90% of properly selected
cases.24 The tumors most suitable for TTT are small, heavily pigmented melanomas
less than 3 mm in thickness, with minimal or no subretinal fluid, and
are located in the extramacular region, not touching the optic disc (Fig. 2). Tumors at the optic disc show greater recurrence and are best managed
with plaque radiotherapy combined with thermotherapy. Choroidal
melanoma treated with TTT should be followed long term because delayed
recurrence, even with extrascleral extension, can occur.25,26 Currently, TTT is used most frequently as a supplement to plaque radiotherapy.27 A newer technique using a transscleral thermotherapy probe has been found
effective for choroidal melanoma and intrascleral tumor.28
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RADIOTHERAPY | |||
Radiotherapy is still the most widely employed treatment for posterior
uveal melanoma. The most commonly employed form of radiotherapy is brachytherapy, using
a radioactive plaque.2,29–35 Several years ago, Cobalt 60 plaque was popular.36 More recently, Iodine-125 and Ruthenium-106 plaques have largely replaced
Cobalt-60 at most institutions.2,37 Originally, plaque radiotherapy was used for small- and medium-sized melanomas
located outside the macular region and posterior to the ora serrata. Later, with
innovations in radiotherapeutic plan, plaque radiotherapy
can be custom designed to treat uveal melanoma at any site within
the eye, including macular melanoma using a round or notched plaque, juxtapapillary
melanoma using a notched plaque, ciliary body melanoma
using a round or curvilinear plaque, iris melanoma using a curvilinear
plaque, and even extrascleral extension of uveal melanoma.31–33,38 Plaque radiotherapy can also be custom fit to treat small, medium, and
even large uveal melanoma up to approximately 12 mm in thickness (Fig. 3). 34 Shields and co-workers found that plaque radiotherapy for large melanoma
was effective with satisfactory tumor control, but complications of
radiation maculopathy and papillopathy often lead to poor long-term vision.34
Another method of radiotherapy is charged particle irradiation.39–42 This technique provides a focused beam of radiotherapy to the region of the tumor from an external source. A recent report showed that the 5- and 10-year rates of regrowth were 3% and 4%, respectively.41 Among the 45 documented recurrences, about one-half occurred at the margin, presumably to because of treatment planning errors. Recurrence of the tumor was independently related to risk of tumor-related death. Similar to plaque radiotherapy, radiation complications in the eye and adnexa can occur.43 Tumor control with charged particle and plaque radiotherapy are similar. Plaque radiotherapy combined with thermotherapy provided excellent tumor in 270 studied patients with only 3% recurrence at 8 years (Figs. 4 and 5). 44 The high control rate of 97% was maintained for eyes with juxtapapillary choroidal melanoma despite the fact that this location is difficult for plaque placement.44 Studies have shown that 5% to 10% of patients treated with radiotherapy ultimately require enucleation of the affected eye because of tumor recurrence or radiation complications.45,46
The Collaborative Ocular Melanoma Study (COMS) was designed to evaluate management of choroidal melanoma in a prospective fashion. The COMS included three substudies: (a) the large choroidal melanoma trial comparing enucleation versus enucleation preceded by external beam radiotherapy, (b) the medium choroidal melanoma trial comparing enucleation versus plaque radiotherapy, and (c) the small choroidal melanoma trial evaluating the natural history of these tumors. The results of the large tumor trial showed no difference in patient survival between enucleation and pre-enucleation radiation groups.48 Five-year Kaplan-Meier estimates for survival were 57% for the enucleation group and 62% for the pre-enucleation radiation group. The medium tumor trial showed no difference in patient survival between enucleation and plaque radiotherapy.30 Five-year Kaplan-Meier estimates for histopathologically confirmed melanoma metastasis were 11% in the enucleation group and 9% in the plaque radiotherapy group. The unadjusted estimates for 5-year survival were 81% for the enucleation group and 82% for the plaque radiotherapy group. The small tumor trial showed that small choroidal melanomas managed by observation showed tumor growth in 21% by 2 years and 31% by 5 years.49 The results of the COMS confirmed numerous previous publications regarding management of choroidal melanoma.50 |
LOCAL RESECTION |
Local resection of melanomas involving the ciliary body and choroid can
be performed using a partial lamellar sclerouvectomy technique.51 This surgical technique is a modification of the one popularized by Foulds, in
which the tumor is removed with the aim of leaving the retina
and vitreous intact.51–53 Local resection of a posterior uveal melanoma offers several theoretical advantages over enucleation and radiotherapy. In contrast to enucleation, it is designed to preserve vision and maintain a cosmetically normal eye. In contrast to radiotherapy, it has fewer long-term complications if the initial surgery is successful. However, it does have more potential immediate complications, such as vitreous hemorrhage, retinal detachment, and cataract,51 whereas radiotherapy is almost never associated with such immediate complications. However, some degree of radiation retinopathy and cataract is common in long-term complications of all forms of radiotherapy. There is no current evidence that local resection of posterior uveal melanoma is any different from enucleation or radiotherapy with regard to patient survival. There are fewer complications and better visual results for smaller, more anteriorly located tumors. More complications can be expected when larger postequatorial tumors are managed in this manner. |
ENUCLEATION | |
As mentioned, the traditional method of treating uveal melanomas by enucleation
was challenged several years ago.5,6 Others continued to believe that enucleation was an appropriate method
of management.7,8 Enucleation generally is indicated for advanced melanomas that occupy
most of the intraocular structures and for those that have produced secondary
glaucoma (Fig. 6). Another relative indication for enucleation is melanoma with optic
nerve invasion. Enucleation with a long section of the optic nerve
seems more reasonable in such cases. However, many juxtapapillary melanomas
that abut the optic nerve and show no evidence of invasion often
can be managed by custom-designed notched radioactive plaques rather
than enucleation.31,35
The so-called “no touch enucleation” was introduced to minimize the amount of surgical trauma and theoretically to lessen the chance of tumor dissemination at the time of surgery.54 An essential aspect of this technique is to freeze the venous drainage from the tumor prior to cutting the optic nerve. The “no touch” technique has recently fallen into disuse at most centers because it is cumbersome and its benefits are only theoretical. However, a very gentle standard technique of enucleation should be employed, without clamping the optic nerve prior to cutting it. There have been recent advances in the types of orbital implants used after enucleation. The hydroxyapatite implant, designed to improve the ocular motility in patients undergoing enucleation, is still used widely, but other motility implants have been introduced.55–57 Pre-enucleation radiotherapy (PERT) has been advocated by some authorities. In general, this involves the use of 2,000 cGy of external beam radiotherapy to the affected eye and orbit prior to enucleation. Several studies have suggested that PERT is not advantageous over standard enucleation alone.48,58 |
ORBITAL EXENTERATION |
The subject of orbital exenteration for uveal melanomas with extrascleral extension also is controversial.59 Complete orbital exenteration should not be performed in cases of mild degrees of extrascleral extension. However, in the rare instance of massive orbital extension in a blind, uncomfortable eye, primary orbital exenteration probably is justified. In most instances of orbital extension of uveal melanoma, it is not necessary to sacrifice the skin of the eyelid. The eyelid-sparing exenteration skin provides a much better cosmetic appearance.59,60 |
MANAGEMENT OF SYSTEMIC METASTASIS |
Ideally, the best management of uveal melanoma is to use methods of preventing
metastasis in the early stages of the intraocular disease.61 Unfortunately, there is no current method of achieving this. Once a uveal
melanoma has metastasized to distant organs, the patient's prognosis
is poor. If the metastasis occurs as a solitary lesion, increased survival
has been achieved with local resection of the metastatic focus.62 There is no current evidence that chemotherapy or immunotherapy is effective
in the primary management of uveal melanomas. The vast majority
of affected patients has no detectable evidence of systemic metastasis
at the time of diagnosis of the uveal melanoma. Consequently, clinicians
have not been inclined to employ such treatment. Likewise, the role of chemotherapy and immunotherapy is unproved in the treatment of patients with systemic metastasis from uveal melanomas. There have been reports of tumor regression after hepatic arterial chemoembolization with cisplatin and polyvinyl sponge.63 There is a possibility that such treatment may prolong survival for a few months, but it is unlikely that it is curative. The role of monoclonal antibodies in the detection and management of metastatic uveal melanoma currently is being investigated. |
COUNSELING THE PATIENT |
Regardless of the method of management selected by the clinician, it is important that the affected patient be informed of all available options. The expected results and potential complications should be explained to the patient and family members in detail. The patient should be informed of the availability of a second opinion from other physicians familiar with uveal melanoma. The final decision regarding management should be made by the patient with guidance of the physician.64,65 |
SUMMARY |
The management of choroidal melanoma depends on several factors, including
patient age, tumor size and location, systemic health of the patient, and
status of the opposite eye. Small asymptomatic melanocytic tumors of the posterior uvea that exhibit dormant features probably can be observed periodically without treatment until definite evidence of growth is documented. Risk factors predictive of tumor growth are useful in identifying high-risk lesions that might benefit from early treatment. Small choroidal melanomas can be effectively treated with techniques of transpupillary thermotherapy or plaque radiotherapy combined with thermotherapy. Radiotherapy can be employed using a variety of episcleral plaques or charged particle treatment. Although the two methods appear to be nearly equal with regard to the development of systemic metastasis, plaques seem to be associated with fewer and less severe local complications. Selected melanomas of the ciliary body and peripheral choroid can be treated by local resection using partial lamellar sclerouvectomy. Local resection techniques have theoretical advantages, but the surgery takes longer and the immediate complications potentially are greater. Enucleation generally is indicated for most large melanomas greater than 15 mm in diameter and greater than 10 mm in thickness. It is also indicated for tumors that have invaded the optic nerve. Pre-enucleation radiotherapy does not provide additional survival benefit to the patient. Orbital exenteration is justified for advanced uveal melanomas with massive extraocular extension. Its value in the management of smaller degrees of extraocular extension is uncertain. It currently appears that chemotherapy and immunotherapy do not provide a therapeutic cure for uveal melanomas, but their true effectiveness awaits the results of further studies. |
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