Larynx Yupa Sumitsawan, Songphol Srisukho

The age standardized inci- cancer in Khon Kaen (Table 2.9.1). dence rate of laryngeal cancer in The age-specific incidence Chapter II Chiang Mai, Lampang, Songkhla rates of laryngeal cancer rise as the and Bangkok is almost equal (4.0, age increases to reach a peak at age 3.4, 3.6 and 4.0) in males. The in- 65-70 in every registration sites in cidence is low in males in Khon both sexes (Figure 2.9.2). Kaen (ASR = 1.4). Among females Most of the cases were histo- the incidence rate is higher in the logically verified (73.9%-95.0%) northern part of the country and those diagnosed on the basis 9 (Chiang Mai and Lampang). There of death certificate only were few was no case of female laryngeal (Table 2.9.1).

LARYNX Figure 2.9.1 Larynx cancer in different regions, 1995-1997 ICD-10 C32 Male Yupa Sumitsawan, M.D. *Spain, Zaragoza 18.0 Songphol Srisukho, M.D. Thailand 3.1

Chiang Mai 4.0

Lampang 3.4

Khon Kaen 1.4

Bangkok 4.0

Songkhla 3.6

0 5 10 15 20

ASR (World)

Female

*USA, 2.9 Connecticut black

Thailand 0.3

Chiang Mai 1.1

Lampang 1.0

Khon Kaen 0.0

Bangkok 0.2

Songkhla 0.3

0 5 10 15 20

ASR (World) *The highest incidence in CI5 Vol. VIII 41

p. 41-¥” Yupa Sumitsawan, Songphol Srisukho Larynx

Figure 2.9.2 Age-specific incidence rates of larynx cancer, 1995-1997 Trend in the incidence rate of carcinoma of larynx is almost Male stable except the declining rate in Chiang Mai registry center from the 100 # period of 1998-1991 and 1992- # # # 1994 in both males and females 10 (Figure 2.9.3). # # # # 1 #

0.1

Incidence per 100 000

0.01 Age 20- 25- 30- 35- 40- 45- 50- 55- 60- 65- 70- 75+

Chiang Mai# Lampang Khon Kaen Bangkok Songkhla

Female 100

# 10 # # # ## 1

0.1

Incidence per 100 000

0.01 Age 20- 25- 30- 35- 40- 45- 50- 55- 60- 65- 70- 75+

Chiang Mai# Lampang Khon Kaen Bangkok Songkhla

Table 2.9.1 Percentage of histologically verified and death certificate only cases, larynx cancer

1995-1997 1998-2000 % HV % DCO % HV % DCO Male Female Male Female Male Female Male Female

Chiang Mai 83.1 87.5 1.2 4.2 87.3 93.2 0.0 0.0 Lampang 78.0 85.7 2.4 0.0 80.0 81.3 16.0 0.0 Khon Kaen 73.9 0.0 0.0 0.0 69.6 60.0 0.0 0.0 Bangkok 87.6 95.0 6.8 5.0 Songkhla 94.0 80.0 0.0 0.0 95.1 75.0 0.0 0.0

%HV = percentage of histologically verified cases, %DCO = percentage of death certificate only cases 42

p. 42-¥” Larynx Yupa Sumitsawan, Songphol Srisukho

Figure 2.9.3 Trend in incidence of larynx cancer

Male 10

4 # # # # # # #

Incidence per 100 000 2 #

0 1989-1991 1992-1994 1995-1997 1998-2000

# Thailand Chiang Mai# Lampang Khon Kaen Bangkok Songkhla

Female 3

# # 1 # # #

Incidence per 100 000 # # # 0 1989-1991 1992-1994 1995-1997 1998-2000

# Thailand Chiang Mai# Lampang Khon Kaen Bangkok Songkhla

p. 43-¥”