Basal cell carcinoma (BCC) is held to be the commonest eyelid malignancy worldwide. Sebaceous gland carcinoma (SGC) is seen more frequently in the Asian and Asian Indian population and known to have the second-worst prognosis among eyelid malignancies.
The outcome of eyelid malignancies depends on the histopathologic diagnosis and the extent. The American Joint Committee for Cancer (AJCC) classification is used for documentation of disease severity. The Indian literature on eyelid malignancies includes several series with contradictory data. No reporting of the extent of disease or AJCC classification of eyelid malignancies in India is available.
In a country with a large geographic extent and diverse population, there is a need for representative data on clinicopathologic features and outcomes on eyelid malignancy in India. This study presents data on eyelid malignancies in India across zones (North, East, West, and South).
The study was a retrospective interventional multicenter study, from five centers located in four geographic zones in India. All the participating ophthalmologists are trained similarly in principles of oculoplastic surgery and ocular oncology. At the time of this study, they had experience between 10 to 15 years and had single-surgeon sub-specialty practices. The duration of the series included in the study ranged from 5 to 12 years; the shortest from 2014–2019, longest from 2008–2019. All authors practice protocol-based management of eyelid malignancies. Only patients with biopsy-proven malignancy were included in this study.
All authors follow similar criteria for clinical diagnosis: Unexplained, rapidly progressive mass lesion, ulceration, loss of lid margin architecture and madarosis, unexplained unilateral blepharoconjunctivitis. The greatest dimension and perpendicular are measured, and a clinical photograph is documented [Fig. 1a-d]. Orbital imaging is advised when the posterior margin of the tumor cannot be determined on clinical examination, presence of proptosis, ptosis, or limitation of ocular movement [Fig. 1d]. Draining lymph nodes are examined clinically. The authors also follow a similar procedure for excision—minimal touch technique with 5 mm margins, margins sent for histopathology marked for orientation, and map biopsy in all SGC. The pathologist confirms the diagnosis and absence of tumor on the margins, and the defect is reconstructed.
Histopathology included hematoxylin–eosin stain on tissue embedded in paraffin sections. The patients from the East zone underwent Oil Red O stain on fresh tissue when there was a suspicion of SGC. Patients underwent immunohistochemistry for other tumors such as eccrine carcinoma, lymphoma, mucinous carcinoma, and so on.
All patients were managed by surgical excision with tumor-free margins verified on histopathology, either on frozen or on the permanent section. Orbital exenteration was performed for orbital extension of the tumor or for SGC with an extensive pagetoid spread. The excision was followed by reconstruction. All patients had a pathologist confirm the diagnosis on permanent section histopathology, and were reviewed at 1 week, 6 weeks, and advised reviews 3 monthly for the first year, and after that yearly.
The data entry was done from medical records, clinical drawings, and clinical photographs. A common data collection form was used, which included the following: Age, gender, referral diagnosis, distance to the clinic, laterality, involvement of upper lid/lower lid/canthus/margin/contiguous conjunctiva, orbital extension, regional lymph nodes, pathology details, AJCC class, treatment, both planned and performed, and outcome (whether recurrence, locoregional spread, or metastasis).
We included all patients with available histopathologic diagnoses for the classification and categories of tumors. This also included patients who did not undergo definitive treatment. For outcome analysis, we included only patients with a follow-up of 3 months or greater.
AJCC 7th edition classification was applied retrospectively based on the recorded dimensions and extent. Some patients had undergone partial excision elsewhere and were categorized as Tx.
Descriptive data were compiled using MS Excel (MS Office 2018). Statistical analysis was done using MedCalc v19.0.5. We assessed clinical and pathologic features as risk factors for locoregional spread and recurrence, using odds ratio and logistic regression analysis.
Patients from the city and outstation patients were compared for the delay to diagnosis and duration of follow-up using the Student's T-test.
The final analysis included a total of 129 patients, with 68 (52.3%) female patients. The mean age of patients was 62.7 years (range 5–92 years). From the first appearance of signs, the median delay to the first consultation was 9 months (mean 17.26 months, range 1–120). The mean distance from home to hospital was 115.2 km (range 0–738 km). Forty-eight patient records showed a referral diagnosis, of which nine (18.7%) had been misdiagnosed as benign. Thirty-one (24%) patients had a history of intervention elsewhere, including incision biopsy, incision and curettage, or excision without margin clearance.
Table 1 shows the clinical characteristics of the tumors. Among the clinical features, 120/129 (93%) patients presented with a mass lesion, 6/55 (10.9%) of the SGC patients presented with blepharoconjunctivitis, 25/129 (19.3%) of all patients had bleeding on presentation, and 17/129 (13%) patients presented with ptosis. One patient who presented with an orbital extension of SGC had a history of treatment for 'ocular cicatricial pemphigoid' for 8 years.
Histopathology revealed [Table 2] SGC to be the commonest. The distribution included BCC, squamous cell carcinoma (SCC), and others. Among the SGC, 22.7% were well-differentiated, 54.5% were moderately differentiated, and 22.7% were poorly differentiated. Pagetoid spread was seen in 23 (41%) patients of SGC. The miscellaneous tumors included 6 (4.6%) cases of eccrine carcinoma and mucinous carcinoma of sweat gland, 2 (1.5%) cases of lymphoma, 1 case of embryonal rhabdomyosarcoma, 1 case of angiosarcoma, 1 case of adenoid cystic carcinoma, and 1 case of adenosquamous carcinoma. Table 3 shows the comparative distribution of the different malignancies in the various zones of the country.
Commonest AJCC classes were T2b and T3a, accounting for 80/111 (72%) lesions. Positron emission tomography (PET) scan was advised at the time of diagnosis to all patients of SGC, all orbital extension, and patients other than BCC [Table 2]. However, due to financial constraints, it was performed in 21 patients, and one showed positive lesions elsewhere in the body at initial assessment. None of our patients underwent sentinel node biopsy. None underwent pre-emptive lymphatic dissection.
Surgery with tumor-free margin was done in 112 eyes, with other patients lost to follow-up after advice [Table 4]. The mean follow-up was 21.44 months, with metastasis and/or recurrence in 14 patients (11.3%). All the recurrences were SGC or SCC. SGC patients showed a 9% recurrence and 14.5% metastasis in spite of histopathologic margin clearance at surgery Table 4. One patient underwent neoadjuvant chemotherapy and orbital exenteration and was lost to follow-up.
There was no difference between metro (37%) and outstation (63%) patients in the mean delay to first consultation (18.73 months versus 18.74 months) or the loss to follow-up (22% versus 26%).
Analysis of adverse outcome (distal metastasis, lymphatic spread, or recurrence) was performed for 98 patients with more than 3 months of follow-up after surgical excision. This included both cases with eyelid lesion excision with clear margins, and with orbital exenteration [Table 4]. On logistic regression analysis [Table 5], the diagnosis of SGC was more likely to have an adverse outcome such as recurrence or metastasis (odds ratio 7.36, P = 0.0115). The involvement of canthus, greatest dimension, and duration of disease did not seem to affect the outcome. On further analysis of SGC versus other tumors, the mean greatest dimension was similar in both categories: 17.3 mm in SGC, 16.5 mm in others, P value = 0.82. The duration of disease was significantly more in non-SGC tumors (mean 12.9 months in SGC, 25.8 months in others, P = 0.05). Involvement of canthus was significantly less in SGC (34% in SGC versus 54.6%, P = 0.02).
BCC is the commonest eyelid malignancy worldwide. Studies from Japan and China show an equal incidence of SGC and BCC [Table 6]. It has long been the impression that the pattern of eyelid malignancies in India differs from that in the Western population. However, the Indian reports have been variable, with different studies describing different distributions of tumors.
Of the Indian studies, three are from plastic surgery or pathology services. All three find BCC to be the commonest eyelid malignancy. They may not reflect the picture seen by ophthalmologists. There are two studies from referral eye institutes. These differ significantly in the distribution of the different diagnoses. Sihotaet al. found BCC, SCC, and SGC to be almost equally common, whereas Kaliki et al. found SGC to vastly outnumber BCC. Due to these contradictory results, one cannot generalize about eyelid malignancy patterns in India from the previous reports. A recent editorial on ocular oncology elaborates on the pitfalls of drawing conclusions for eyelid malignancy for the entire country from retrospective data of a single referral center. Our study aims to address the need for a data set, which is more truly representative of the country.
The incidence of cutaneous cancers has been associated with skin color, sun exposure, or a location closer to the equator. The Indian mainland spans 8°4′N to 37° 6 ′N latitudes and a wide variety of climate. The Indian population also shows diversity in skin pigmentation. Thus, a multizone study such as ours yields the most representative data on eyelid malignancies in India.
The AJCC classification [Table 7] is increasingly commonly used. In SGC and SCC, higher T grading in the AJCC classification is predictive of nodal metastasis, systemic metastasis, and mortality. These existing studies use the AJCC 7th edition. Our series also uses AJCC 7th edition classification in a retrospective fashion and allows comparison to current literature. The largest number of patients presented to the oncology service with tumor Group 2a to Group 3a, permitting surgical resection and sparing the globe. The AJCC 8th edition is in use from January 2018. It will be useful to prospectively stage eyelid malignancies as per the 8th edition.
SGC is known for aggressive behavior, with 12–40% loco-regional spread and mortality. Our study shows that the prevalence of SGC is the commonest in Indian population. We also see an Odds ratio of 7.36, that SGC will lead to a worse outcome than non-SGC.
Canthal involvement and the greatest dimension of tumor were not found significant for adverse outcomes. We did not analyze the greatest dimension and AJCC classification separately since the latter incorporates the size of the tumor. Delay from the onset of disease to diagnosis was not significant for adverse outcomes [Table 5]. These results are unexpected since each of these factors has been shown to influence prognosis. We hypothesize that this result comes from a combined analysis of the different kinds of tumors. The SGC outcomes were much worse compared to any other tumor. SGC had a significantly shorter duration of disease than others and fewer canthal involvement. The greatest dimension of SGC was similar to that of other categories, but with worse outcomes. Overall, the prognosis of SGC was so serious as to supersede the other known risk factors in this series.
When comparing the use of frozen section versus permanent section for margin clearance, we found no significant difference in the outcome. The authors emphasize that tumor-free margins must be obtained on the excision of an eyelid malignancy, whether by frozen section or by permanent section [Table 5]. A permanent section histopathology may require the surgeon to excise more tissue at a second sitting before reconstruction is done. A recent study shows that while the frozen section closely approximates the results of the permanent section, the sensitivity of the permanent section is better than that of the frozen section in SGC. There is also data to show that delayed reconstruction after paraffin section margin clearance gives good results. However, wherever the facility is available, a single-stage procedure with on-table frozen section margin clearance and reconstruction would be preferable.
Logistic and financial difficulties are a hurdle in seeking timely help for malignancies. Before referral to subspeciality practitioners, there had been misdiagnoses in 19% and inappropriate management in 24%. We found that the delay to first consultation and loss to followup were similar in patients from within the city versus out-station patients. Patients were motivated to travel a mean of 115.2 km for specialty treatment. This knowledge can help future planning of subspecialty services in ophthalmology.
The strength of the study is that it is a multi-zonal, multicentric study, including both urban and rural patients, and including AJCC classification. The authors follow similar patterns of evaluation, documentation, management, and follow-up protocol as mentioned in the methods section. This permits homogeneity in data collection. The weakness of the study is that the pathologic evaluations of the tumors were performed at different locations, and may not have been uniform. This study is a retrospective, hospital-based study, and subject to the limitations of design. We cannot comment on the incidence or prevalence of the disease conditions from this study. In future, a national registry of ocular oncology-pathology may help in a prospective study of such disease.
In conclusion, this study offers a representative look at the mix of eyelid malignancies in India, the severity of presentation and outcome. The proportion of SGC is high, and this is the single largest risk factor for poor outcome.
2.2 Financial support and sponsorship
2.3 Conflicts of interest
There are no conflicts of interest.
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