Dose

Considerations

in Total Mycosis

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THEODORE

C.

M.

LO,’

Skin Electron

skin

most

effective

electron

irradiation

modes

of

(TSEI)

FERDINAND

remains

treatment

for

A.

one

SALZMAN,’

AND

KENNETH

A.

WRIGHT2

energies up to 3.5 MeV. We believe this energy is adequate for lesions not more than 1 cm thick. Both the physical aspects and the dosimetry of the apparatus have been described in detail [7].

The total the specified

treatment maximum

dose reported throughout this paper is entry dose computed with the formula SMD=(dfi’)

where

SMD

number

is the total

of cycles

per

per field,

f is the

designates

the

specified

maximum entry dose, c is the d is the daily entry dose of fields per cycle, and the subscript

treatment

number

technique

course,

used.

The

advantages

of

the

use

of

the SMD concept have been discussed [5]. It standardizes the method of reporting doses among various institutions when different techniques are employed, and it guides the therapist to limit total dose within acute and chronic normal tissue tolerance. Obviously, during each treatment session all fields used must be complementary to one another. All 200 patients presented with generalized multiple or confluent skin lesions covering at least 50% of the total skin area, and none had clinical evidence of nodal or systemic disease on the first day of TSEI. Pathology was reviewed and confirmed by our pathologists. Before January 1972, the six-field cycle technique was used, and since then, an eight-field cycle technique has been used. The details of these techniques have been discussed [5]. All patients were treated on a 5 day per week basis.

of the

generalized

for

Fungoides

Two hundred patients with generalized cutaneous mycosis fungoides were treated with total skin electron Irradiation (TSEI) in the Lahey Clinic Radiotherapy Department-MIT High Voltage Research Laboratory between 1964 and 1973. None of the patients had any clinical evidence of extracutaneous disease at presentation. The 3-year absolute survival rate was 54% (107 patients). Analysis of these 107 long-term survivors evaluated the relation between incidence of generalized cutaneous recurrence and total treatment dose given during the initial course of TSEI. Results indicated that in patients with erythroderma , the need for a second course of TSEI was inversely related to the total dose given during the first course. However, the curve seemed to flatten at about 1 ,500 cGy (rad). In plaque disease, the percentage of patients who received repeated courses of TSEI seemed to be relatively constant independent of total dose given during the initial course (65%-80%). In patients with tumor lesions, the incidence of generalized cutaneous recurrence was directly proportional to total dose. The optimal dose of TSEI for patients with mycosis fungoides may vary depending on types of skin lesions. Total dose during the initial course of TSEI should be kept relatively conservative, particularly in patients with generalized plaques where relapse rate is high allowing reserve of normal tissue tolerance for further TSEI when indicated.

Total

Irradiation

my-

cosis fungoides confined to the skin today [1-6]. Although cure rates are still low, its palliative value is definitely irrefutable [1 2, 5, 6]. However, once disease has progressed beyond the cutaneoussystem, prognosis becomes ominous, and survival is measured in terms of months [4] Unfortunately systemic chemotherapy, either single agent or combination drugs, has not been

Results

,

.

found

[4].

total

skin

effective

Thus,

in control

meaningful

electron

with for

was carried with respect

of the

assessment

irradiation

group of patients skin who survived study patients

after

would

disease

of the pertain

value

only

107

to

evaluate control

such a with TSEI.

Two

hundred

new patients

and

with

of

cosis fungoides were treated with total (TSEI) in the Lahey Clinic Radiotherapy

Voltage

Research

constant

potential

de Graaff Received

type with July

Laboratory

are

Methods

generalized

accepted

between

after

my-

1964

revision

and

1973.

overall

all 200

survival

patients.

56

for

3 years

patients

had tumors. was commonly

or longer;

had

The

survived

for

at 3 years Patients

into three subgroups by primary on the first day of TSEI. Of the

were

lesion type 200 patients,

32 patients

plaque

lesions,

had and

Fourteen

19

poor prognosis of patients with due to rapid onset of metastatic

3 years

only a irradiation,

or longer.

These

single and

patients

listed by primary lesion type shown in table 1. Table 2 shows the current status of this group patients

were

considered studied needed

ment since the initial course of TSEI. highest cure rate was demonstrated

of

“cured.” for at further

35 All

least 5 treat-

As expected, in the group

the of

30, 1978.

Presented at the annual meetina of the American Radium Society, New Orleans, April 1978. 1 Department of Radiotherapy, Lahey Clinic Foundation, Boston, Massachusetts 02215. Address reprint 2 High Voltage Research Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts AJR 132:261-263, February 1979 © l979American Roentgen Ray Society

for

of these patients have now been years (table 3) and none of them

The

was of the Van electrons with

October

of TSEI

survived

of them

patients.

skin electron irradiation Department-MIT High

electrostatic generator used the capacity of producing

17, 1978;

cutaneous

absolute

visceral disease [5]. Among all 200 patients, 81 received course of TSEI without further electron 35

Subjects

(54%)

patients tumors

to the

group

initiation

the

erythroderma,

of

clinical disease confined to the a substantial length of time. A

out to to local

1 shows

categorized as presented

,

significantly

date

Table

261

requests 02139.

to T. C. M. Lo.

0361

-803X/79/1322-0261

$0.00

LO

262

MR:132,

ET AL.

TABLE

February

1979

1

Survival Plaque

Tumor

Total

57 32 (56)

89 56 (63)

54 19 (35)

200 107 (54)

36 (63)

25 (28)

20 (37)

81 (41)

19 (53)

13 (52)

3 (15)

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Erythroderma

Total patients Overall 3-year survival One course of TSEI: Patients studied Survived

3 years

Note-Numbers

in parentheses

TABLE Status

of 3-Year

Survivors

TABLE

2

Who Had Only One Course Erythro-

Plaque

derma

disease

6t

9

2

Died from disease

2

2

0

19

Total .

One patient died of intercurrent

disease

at 5 years

13

were

interested

long-term

survivors.

relation

between

the

with

erythroderma,

the

need for a second course of TSEI was inversely proportional to the total dose given during the initial course (table 5). Clinically this implies that for this type of lesion, high-dose irradiation would perhaps be indicated if tolerance

allowed.

However, tients

plaque

received

disease,

repeated

the

courses

percentage of TSE1

particular

to

type

of

lesion

even

with

an

with than

years

for

tumor 1,500

this

1,300

6

7

5 6 7 8 9 10

1,125 1,125 3,000 1,800 1,800 900 1,200

6 6 6 8 8 8 8

5 5 6 5 5 5 5

900 1,000

6 6

11 5

1,200

6

12

11

Plaque: 12 13

Tumor: 14 .

who rad),

analysis.

received only one

This

high-dose survived

patient

irradiation longer than

received

Specified

maximum

entry

dose.

TABLE All 3-Year Survivors

4

Who Had More Electron Course

Therapy

Than One

of TSEI Erythro-

Plaque

Tumor

43 78 5 15 28

16 84 4 6* lOt

derma

No % Spotsonly Dead Living with .

13 41 1 6 7

disease

One patient died of intercurrent

disease

(had two TSEI and one spot treatment). t One patient is NED 5 years after

(NED) 8 years after last spot irradiation

last spot

irradiation

(had

one

TSEI and

seven

treatments).

course

of TSEI

at 3 years

a second

and

is now

living

with

disease

at 5 years. Discussion

aggressive

initial approach. in patients with tumors the incidence of generalized cutaneous recurrence was directly related to total dose (table 5). Unfortunately, among the six patients (more

4

of paseemed

be relatively constant, ranging from 65% to 80% regardless of total dose given during the first course of TSE1 (table 5), suggesting a universally high relapse rate for this

12 6 5

spot

for

who

6 6 6

treat-

course of TSE1 and subserecurrence when a second among this group of 107

In patients

900 1,200 1,050

3



in the

Survival (years)

2 3

1

patients with erythroderma. Of these 14 patients, 13 received a total dose of less than 2,000 rad. Unfortunately, once cutaneous disease recurred after the initial course of TSEI the chance of ‘cure” appeared to be extremely remote. Table 4 shows the outcome of the 72 3-year survivors who required further electron irradiation, either local spot treatment or TSEI or both, after the initial course of TSEI; only two patients could be considered “cured.” One patient with tumor died from an automobile accident 8 years after two courses of TSEI and one course of local “spot” irradiation, and another patient with tumor survived 5 years free of disease after one course of TSEI and seven courses of local spot treatments. We

nique (no. fields)

Erythroderma:

t One patient is now NED after a course of chlorambucil.

mont dose during the first quent generalized cutaneous course of TSEI was required

of TSEI Tech-

(NED).

,

3

DoseS (rad)

c ass

1

with

(43)

after One Course

Tumor

2

Living

“Cure”

of TSEI

11

Cured

35

are percentages.

3

Mycosis

fungoides

lymphomatous system. The undetermined skin

means

electron

for

is

a

rare

and

chronic

form

of

malignancy arising from the cutaneous optimal treatment for this disease remains today. However, the distinct value of total irradiation,

local

control

as one

of this

of the

disease,

most

successful

is well

known.

AJR:132,

February

ELECTRON

1979

TABLE incidence

of Generalized

5

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(N

=

All 3-Year No. Patients

Recurrence Rate (%)

17 9 3 3

9(53) 2 (22) 0 1 (33)

28

19(68) 11 (65)

17

1,500-2,500

5

4

2,500-3,000 3,000-4,000

3 3

2 (67) 2 (67)

7

5 (71)

>1,500(1,687)

1

1(100)

Unfortunately, the prognosis becomes ominous as soon as the disease has spread beyond the cutaneous system, since response to chemotherapy has been poor [4]. Thus, we believe that meaningful assessment of the value of TSE1 would pertain only to the group of longterm survivors with disease still confined to skin. Our results are similar to those reported by others [2, 8]. In patients with generalized skin lesions, the cure after

one

single

course

of TSE1

is less

than

10%,

even when higher doses were given. Apparently TSE1 alone is not expected to be the curative mode of treatment for this disease. Many centers including ours have embarked on a program to give patients adjuvant topical nitrogen mustard after completion of TSEI. No significant improvement in long-term disease-free survival has been seen so far [9]. Others are also using a multidisciplinary approach with TSE1, total nodal photon irradiation, topical nitrogen mustard, and systemic chemotherapy. The results remain pending at present [8]. Our

results

suggest

that

in patients

with

erythroderma,

total dose during the initial course of TSE1 is inversely related to generalized recurrence rate. However, in patients with plaques or tumors, this relationship seems to be much less obvious. The Stanford group also found that while the incidence of complete regression was directly related

to treatment

dose

during

their

particularly relapse tolerance

group

of

patients

an inverse relationship tumor lesions [2].

lesions.

course

that the fungoides We

of

TSEI

rate for

believe

be

in patients is high, further

erythroderma, group

optimal dose of TSEI may vary depending that

should

with in their

with allowing TSEI

total kept

dose

generalized reserve

when

pa-

for patients on type of

during

relatively

of

the

initial

conservative, of

plaques normal

where tissue

indicated.

REFERENCES

DO, Salzman FA, Trump JG, Wright lymphoma cutis with low megavolt electron beam therapy; nine year follow-up in 200 cases. South Med J 54 : 769-776, 1961 2. Fuks ZY, Bagshaw MA, Farber EM: Prognostic signs and the management of the mycosis fungoides. Cancer 32: Fromer

KA:

6(55)

1,100-1,500

rate

skin

1.

11

in

was with

263

(80)

19):

1,10O

TSEI

FUNGOIDES

We conclude with mycosis

56):

=

MYCOSIS

there tients

Survivors

32):

1,100-1,500

Tumor(N

FOR

of

Recurrence:

SMD (rad)

Erythroderma 1,100 1,100-1,500 1,500-2,500 2,500-3,500 Plaque (N = 1,100

IRRADIATION

the first course

1385-1395,

JL, Johnston Management of

1973

3. Hare HF, Fromer JL, Trump JG, Wright KA, Anson JH: Cathode ray treatment for lymphomas involving the skin. Arch Dermatol 68 : 635-642, 1953 4. Levi JA, Wiernik PH: Management of mycosis fungoidescurrent status and future prospects. Medicine 54:73-88, 1975

Lo TCM, Salzman FA, Moschella SL, Tolman EL, Wright KA: Whole body surface electron irradiation in the treatment of mycosis fungoides: an evaluation of 200 patients. Radiology. In press, 1979 6. Smedal Ml, Johnston DO, Salzman FA, Trump JG, Wright KA: Ten year experience with low megavolt electron therapy.AJR 88:215-228, 1962 7. Trump JG, Wright KA, Evans WE, Anson JH: High energy electrons for treatment of extensive superficial malignant lesions.AJR 69:623-629, 1953 8. Wallner PE, Brady LW, Vonderheid E, Van Scott EJ: Technical considerations for a program of remission induction and maintenance of mycosis fungoides utilizing total body electrons, total nodal photons, topical nitrogen mustard and systemic chemotherapy. Presented at the annual meeting of the American Society of Therapeutic Radiologists, Denver, November 1977 9. Price NM, Hoppe RT, Constantine VS, Fuks ZY, Farber EM: The treatment of mycosis fungoides: adjuvant topical mechlorethamine after electron beam therapy. Cancer 40:28512853, 1977 5.

Dose considerations in total skin electron irradiation for mycosis fungoides.

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